1 00:00:00,000 --> 00:00:09,660 what gets FPS gpus what gets more FPS 2 00:00:06,299 --> 00:00:11,340 more gpus obviously everybody thinks so 3 00:00:09,660 --> 00:00:16,619 and manufacturers have been working on this technology since the late 90s so 4 00:00:13,920 --> 00:00:19,859 then what the heck happened to it I'm gonna let you know a little secret 5 00:00:17,760 --> 00:00:23,279 come here hide 6 00:00:21,720 --> 00:00:27,060 future now that might seem like a bold 7 00:00:25,140 --> 00:00:31,740 prediction given that NVIDIA just completely removes the multi-GPU links 8 00:00:29,580 --> 00:00:36,480 from their latest generation even on the premium workstation cards but there is a 9 00:00:34,320 --> 00:00:42,239 clear course set for better performance through multi-GPU Graphics Solutions and 10 00:00:40,020 --> 00:00:46,680 the most bizarre part is that it's Apple who ultimately did it to properly see 11 00:00:44,820 --> 00:00:53,219 where we're going sometimes we have to visit the past which is why we got our 12 00:00:48,960 --> 00:00:57,180 hands on this legendary piece of Kit the 13 00:00:53,219 --> 00:01:00,539 quantum 3D Mercury brick is an 8 GPU 14 00:00:57,180 --> 00:01:02,460 design from 25 years ago that has a lot 15 00:01:00,539 --> 00:01:07,200 more in common with your future gaming rig than you probably realize like you 16 00:01:05,460 --> 00:01:12,060 realize I'm about to tell you about our sponsor zoho1 unify all your business 17 00:01:10,080 --> 00:01:16,200 processes into one comprehensive platform and improve productivity with 18 00:01:14,159 --> 00:01:20,460 Zoho one you can lay all concerns about integration and compatibility to rest 19 00:01:18,420 --> 00:01:24,740 follow the link below for a free 30-day trial Our Story begins today with the 20 00:01:22,619 --> 00:01:28,080 quantum 3D obsidian 100sb-440v that Ross tregamba 21 00:01:26,880 --> 00:01:33,060 thoughtfully brought along when we shot our Voodoo 5 6000 video the name might 22 00:01:30,900 --> 00:01:38,159 not sound like much but it's a great example of something that the original 23 00:01:34,740 --> 00:01:41,880 3dfx Voodoo one was capable of even if 24 00:01:38,159 --> 00:01:44,579 it rarely did it dual GPU operation in 25 00:01:41,880 --> 00:01:49,079 this case on a single board now these ones were intended for desktop PCS but 26 00:01:47,100 --> 00:01:54,899 the primary purpose of cards like this was to drive arcade machines more on 27 00:01:52,259 --> 00:02:00,479 that later because first I want to talk about the brick this extremely rare 28 00:01:58,140 --> 00:02:07,320 piece of computing history uses a four card setup with each card equipped with 29 00:02:03,360 --> 00:02:08,880 two Voodoo 2 gpus that is eight gpus 30 00:02:07,320 --> 00:02:13,980 running all together on the same workload now I know what you're thinking 31 00:02:11,720 --> 00:02:19,020 that looks like it would have a tough time fitting in a PC that also needs 32 00:02:16,319 --> 00:02:25,140 dedicated cards for sound networking and yes 2D Graphics to run the desktop 33 00:02:22,020 --> 00:02:27,480 because the voodoo 2 was 3D only and 34 00:02:25,140 --> 00:02:31,739 you'd be right about that but again more on that later for now 35 00:02:29,220 --> 00:02:35,099 it's time to see this thing in action I was going to be the one to install the 36 00:02:33,360 --> 00:02:40,020 brick in this simulator chassis from 1999 but understandably the owner didn't 37 00:02:37,560 --> 00:02:44,879 trust me to do it without dropping it so um I didn't but we've got some b-roll of 38 00:02:42,180 --> 00:02:49,140 how it goes in it's wild I mean all four cards need to go into their own PCI 39 00:02:46,739 --> 00:02:54,000 slots then it's got to be wired up to a VGA out and in then it's got to be wired 40 00:02:52,080 --> 00:02:57,480 up to a VGA pass-through at the back of the chassis then these two cables are 41 00:02:56,099 --> 00:03:03,360 wired up to the back for a feature called swap lock that allows more than 42 00:03:00,239 --> 00:03:07,019 one of these than twenty thousand dollar 43 00:03:03,360 --> 00:03:08,940 machines to be utilized at once the rest 44 00:03:07,019 --> 00:03:12,959 of these specs are high end even if relatively mundane we've got dual 45 00:03:10,800 --> 00:03:18,900 Pentium 3500 megahertz processors what appears to be an Intel first party 46 00:03:15,300 --> 00:03:21,060 extended motherboard a mere 425 watt 47 00:03:18,900 --> 00:03:25,860 power supply from the legendary PC power and cooling we've got 256 Megs of RAM a 48 00:03:24,000 --> 00:03:31,019 gigantic sound card that's as big as some gpus today and then a ton of 49 00:03:28,739 --> 00:03:35,760 cooling is especially for the time dual 92 millimeter fans and then a couple 50 00:03:33,420 --> 00:03:40,560 more 80 mils that blow directly down onto the heatsinks over the gpus with 51 00:03:37,920 --> 00:03:43,459 this what looks very handmade shroud let's fire it up 52 00:03:43,680 --> 00:03:46,680 oh 53 00:03:46,799 --> 00:03:53,220 this is part of the simulator experience it needs to sound like it's taking off 54 00:03:51,299 --> 00:03:57,000 wait there's no event for those 80 millimeter fans 55 00:03:55,379 --> 00:04:02,819 they're just yeah it's got enough spacing in there for just okay all right 56 00:04:00,239 --> 00:04:06,659 Windows NT let's go we have a few options for things we can run we could 57 00:04:04,620 --> 00:04:09,959 play games on it which obviously is the first thing I would have done if I 58 00:04:07,920 --> 00:04:12,959 worked at a military installation in one of these showtimes how fast does it run 59 00:04:11,700 --> 00:04:16,739 halfway but we actually also have some simulator 60 00:04:15,120 --> 00:04:22,139 software cool it's so weird seeing a Sierra 61 00:04:18,780 --> 00:04:24,540 splash screen when you fire up half-life 62 00:04:22,139 --> 00:04:33,800 you mean valve right right about okay all the geometry what the what that 63 00:04:29,580 --> 00:04:36,419 stop stop buddy check out the pixelation 64 00:04:33,800 --> 00:04:41,340 whoa the first thing I noticed was that compared to the voodoo 5 6000 the frame 65 00:04:38,820 --> 00:04:47,460 rate is obviously lower what I didn't think to look at 66 00:04:42,900 --> 00:04:52,080 is house move it is what the 67 00:04:47,460 --> 00:04:54,360 this was possible in 1999 68 00:04:52,080 --> 00:04:59,400 I think that's functionally 16 times anti-aliasing this looks 69 00:04:57,300 --> 00:05:03,000 modern cleaner than modern 70 00:05:01,259 --> 00:05:09,000 it looks like a much higher resolution than it is that is wild 71 00:05:06,479 --> 00:05:13,620 like I'm specifically going out of my way to put these straight lines at just 72 00:05:11,820 --> 00:05:18,060 you know ever so slight an angle so that I can see the stairs 73 00:05:15,300 --> 00:05:22,380 it's just not there it really makes the crappy old texture stand out doesn't it 74 00:05:19,979 --> 00:05:27,479 oh yeah like if this had the horsepower to run modern games with modern 75 00:05:24,419 --> 00:05:29,720 resolution textures it would look so 76 00:05:27,479 --> 00:05:29,720 good 77 00:05:30,500 --> 00:05:33,500 blah blah 78 00:05:34,139 --> 00:05:40,620 blah blah got him it's Hardware level anti-aliasing okay that's pretty wild I 79 00:05:39,180 --> 00:05:44,759 think I do kind of need to see it without the hardware anti-aliasing then 80 00:05:42,960 --> 00:05:49,800 okay so how do you uh is that something you can change while the game is running 81 00:05:46,320 --> 00:05:52,740 yes oh no way yeah so no wait wait what 82 00:05:49,800 --> 00:05:57,600 so this is a Medusa cable uh-huh so it's got a 26 spin guy here two bgas so what 83 00:05:56,100 --> 00:06:03,240 we're gonna do is we're gonna bypass this by just plugging into one of the 84 00:06:00,300 --> 00:06:08,940 boards individually so in this case each board is a dual GPU GPU and the other 85 00:06:06,840 --> 00:06:14,100 three boards are just contributing to more anti-aliasing correct yeah so the 86 00:06:12,120 --> 00:06:18,600 bridge is basically combining the image it's basically four instances of voodoo 87 00:06:16,440 --> 00:06:25,440 to SLI okay basically what it is so I'll get the same FPS correct but it'll look 88 00:06:22,020 --> 00:06:27,360 like crap exactly 89 00:06:25,440 --> 00:06:34,740 we're both going pretty much the same place slightly different stages I can confirm 90 00:06:31,800 --> 00:06:39,720 anti-aliasing no longer working now it still looks smoother than it 91 00:06:36,960 --> 00:06:44,460 would on an LCD just because CRTs have they're not really pixels they're more 92 00:06:42,000 --> 00:06:48,120 like dots so they're they're not squared at the edges 93 00:06:45,600 --> 00:06:52,860 but you can really see the difference here oh look especially on objects that 94 00:06:51,060 --> 00:06:57,960 are farther away where the level of detail is lower like those picture 95 00:06:54,300 --> 00:06:59,759 frames yeah that's a big yikes 96 00:06:57,960 --> 00:07:05,160 and the shimmering as I'm moving back and forth that is a big difference not 97 00:07:03,780 --> 00:07:09,900 the kind of difference the average home user would pay for but a difference 98 00:07:07,440 --> 00:07:14,180 nonetheless let's try some simulation stuff it's a non-interactive right I 99 00:07:12,419 --> 00:07:18,800 guess I wouldn't have whatever control cockpit they would use for something 100 00:07:16,259 --> 00:07:18,800 like this 101 00:07:20,039 --> 00:07:23,539 and that is smooth 102 00:07:23,639 --> 00:07:30,300 60fps in 1999 103 00:07:27,840 --> 00:07:35,759 that's the thing we got to remember hold on I'm not I'm not done I'm not done 104 00:07:32,639 --> 00:07:38,900 checking out how smooth the terrain 105 00:07:35,759 --> 00:07:41,520 looks like yeah we're seeing that 106 00:07:38,900 --> 00:07:47,039 whether that's like a frame pacing issue or whether that's just a vsync issue 107 00:07:45,240 --> 00:07:52,500 isn't it pretty incredible how well the AAA Works in this thing 108 00:07:48,740 --> 00:07:54,960 anti-aliasing is unreal 109 00:07:52,500 --> 00:07:58,440 like look at these particle effects like yeah they're not amazing or 110 00:07:56,940 --> 00:08:02,639 whatever but they exist 111 00:08:01,020 --> 00:08:08,220 there's just no other way to put it this machine is mind-blowing but what's most 112 00:08:05,759 --> 00:08:13,979 mind-blowing about it at least to me is that the maker of the brick Quantum 3D 113 00:08:10,740 --> 00:08:15,900 still exists as a producer of simulation 114 00:08:13,979 --> 00:08:19,620 hardware and software if you remember the Evans and Sutherland Sim Fusion card 115 00:08:18,240 --> 00:08:22,860 that we looked at a couple of years ago these guys probably would have been in 116 00:08:21,479 --> 00:08:29,580 competition with that at some point going back to the days of the brick though they sometimes sold enhanced 117 00:08:26,759 --> 00:08:34,979 versions of 3dfx's single GPU cards to enthusiasts with extras like additional 118 00:08:32,520 --> 00:08:39,000 video memory and texture units but their main business was to act as 3dfx's 119 00:08:37,020 --> 00:08:43,200 arcade and simulation division until they were spun off as their own company 120 00:08:40,500 --> 00:08:47,339 in 1997. with that history it makes a lot of sense that they had the know-how 121 00:08:44,700 --> 00:08:52,140 to create Exotic Solutions like these out of voodoo gpus the first known use 122 00:08:49,980 --> 00:08:57,240 of a Quantum 3D card was Ice Home Run Derby in 1996 and a lot of high-profile 123 00:08:55,320 --> 00:09:01,800 games like San Francisco Rush would go on to use them too these were not cheap 124 00:08:59,640 --> 00:09:06,720 solutions ending up insist is costing anywhere from over a thousand to 125 00:09:04,019 --> 00:09:10,440 thousands to in excess of ten thousand dollars but while it would have been 126 00:09:08,580 --> 00:09:14,580 Unthinkable for a home user to spend more than a few hundred dollars on a 127 00:09:12,360 --> 00:09:19,620 gaming device at the time at the high end Quantum 3DS devices were used for 128 00:09:16,740 --> 00:09:23,580 military simulation and even down at the low end they could be expected to 129 00:09:21,060 --> 00:09:26,940 deliver tens of thousands of dollars of revenue for their owners quarter by 130 00:09:25,200 --> 00:09:31,560 quarter over the lifetime of the machine and it's that lifetime that was one of 131 00:09:29,580 --> 00:09:36,899 their big advantages because before Quantum 3D it was quite common for 132 00:09:33,839 --> 00:09:40,080 arcade games to use bespoke Hardware or 133 00:09:36,899 --> 00:09:42,720 at best a platform like the Neo Geo by 134 00:09:40,080 --> 00:09:47,220 comparison Quantum 3DS platform was more or less a PC in all but form factor 135 00:09:45,060 --> 00:09:51,420 which made changing over to a new game even one that requires a hardware 136 00:09:48,959 --> 00:09:55,920 upgrade much simpler and more cost effective than it had been in the past 137 00:09:52,860 --> 00:09:58,740 often game data was even stored on a bog 138 00:09:55,920 --> 00:10:03,300 standard IDE hard drive and because the Glide API that the gpus ran on was 139 00:10:00,899 --> 00:10:09,240 readily available and had a similar syntax to opengl games were much easier 140 00:10:06,300 --> 00:10:13,260 to prototype and develop then as now the hardware is only part of the battle and 141 00:10:11,339 --> 00:10:17,160 the real work is in making it easier for developers to get the most out of it and 142 00:10:15,180 --> 00:10:21,540 get the most out of it they did the additional power on tap from Quantum 3D 143 00:10:19,500 --> 00:10:27,660 cards could be used in one of two ways either as a traditional SLI setup where 144 00:10:24,540 --> 00:10:30,120 the additional GPU or gpus could be used 145 00:10:27,660 --> 00:10:34,140 to push resolutions or frame rates higher than they would be able to 146 00:10:31,440 --> 00:10:39,740 otherwise or as was common in the simulator space to have multiple cards 147 00:10:36,600 --> 00:10:42,240 generate the same image but with rotated 148 00:10:39,740 --> 00:10:46,440 anti-aliasing patterns this was a way for them to Output ridiculously smooth 149 00:10:44,220 --> 00:10:50,399 Graphics in the absence of resolution that was high enough to prevent aliasing 150 00:10:48,300 --> 00:10:55,260 that is how the Mercury brick would have been used and this was actually very 151 00:10:52,860 --> 00:11:00,240 important because in a simulator hard pixel edges can be very distracting 152 00:10:57,360 --> 00:11:06,420 unlike our new circuit desk pad on LTT Store stealthy AF now of course with the 153 00:11:03,480 --> 00:11:10,740 demise of 3dfx came the demise of SLI as the world knew it then but that didn't 154 00:11:08,459 --> 00:11:14,399 mean that companies like Quantum 3D and Evans in Sutherland were left without 155 00:11:12,300 --> 00:11:18,839 Hardware to sell multi-GPU development was seen as essential in the Sim Space 156 00:11:16,680 --> 00:11:23,160 and continued in Earnest even while there wasn't yet an official way to make 157 00:11:20,820 --> 00:11:28,140 it work for major players be they NVIDIA or ATI in fact Alienware even had a 158 00:11:26,459 --> 00:11:32,940 project in the works to run multiple gpus before New Age SLI and Crossfire 159 00:11:31,260 --> 00:11:37,260 came along when those Technologies finally hit the scene though multi-GPU 160 00:11:35,040 --> 00:11:40,800 came back to the masses in a big way with some very interesting 161 00:11:38,579 --> 00:11:45,839 implementations early Crossfire for example required a master GPU that 162 00:11:43,980 --> 00:11:50,220 stitched together the output from multiple gpus rendering different parts 163 00:11:48,120 --> 00:11:54,180 of the scene with an external dongle this method is called split frame 164 00:11:52,140 --> 00:11:58,500 rendering and is similar in concept to how old school SLI used to work it 165 00:11:56,700 --> 00:12:03,000 wasn't ideal though even aside from the hardware complexity this setup limited 166 00:12:00,540 --> 00:12:06,660 the maximum resolution there was also software Crossfire at the time which 167 00:12:04,800 --> 00:12:11,579 allowed dongle free operation directly over the PCI Express bus but PCIe wasn't 168 00:12:09,899 --> 00:12:16,740 as fast then as it is now and it was only really suitable for low end gpus 169 00:12:13,680 --> 00:12:18,839 newage SLI and Crossfire X meanwhile 170 00:12:16,740 --> 00:12:23,579 used Bridges between the Cards themselves which is actually quite 171 00:12:20,940 --> 00:12:27,959 similar to 3dfx's SLI the difference though was that rather than stitching 172 00:12:25,620 --> 00:12:32,160 together scan lines or quadrants of the screen the cards could communicate with 173 00:12:29,760 --> 00:12:37,440 each other over the bridge and divide up their work by each rendering alternating 174 00:12:34,380 --> 00:12:40,920 frames leading to you guessed it a 175 00:12:37,440 --> 00:12:44,579 return to multi-GPU cards like the GTX 176 00:12:40,920 --> 00:12:46,680 590 and Radeon 6990 even three-way and 177 00:12:44,579 --> 00:12:51,360 4-way configurations were possible using multiple Bridges these setups were 178 00:12:48,839 --> 00:12:55,440 gargantuan and power hungry but they represented the best performance you 179 00:12:52,980 --> 00:12:59,459 could get at the time and unlike in the past they were available to the general 180 00:12:57,180 --> 00:13:03,660 consumer now while it's obviously simpler to implement the alternate frame 181 00:13:01,800 --> 00:13:07,740 rendering approach unfortunately led to the micro stuttering that we became 182 00:13:05,279 --> 00:13:12,480 familiar with in the 2010s since each GPU might complete its frame in a 183 00:13:10,200 --> 00:13:16,260 slightly different amount of time the pacing of frame delivery could be all 184 00:13:14,399 --> 00:13:20,940 over the place resulting in impressive benchmarks but a really poor gaming 185 00:13:18,660 --> 00:13:24,839 experience some attempts were made to smooth out frame delivery NVIDIA for 186 00:13:23,100 --> 00:13:28,200 example released a high bandwidth version of the SLI bridge that allowed 187 00:13:26,579 --> 00:13:32,820 the cards to communicate more quickly but it just wasn't able to keep up with 188 00:13:30,660 --> 00:13:36,899 advancements in monitor technology both in terms of resolution and refresh rate 189 00:13:35,279 --> 00:13:42,600 these Niche projects were taking considerable resources from both AMD and 190 00:13:39,779 --> 00:13:46,139 NVIDIA that along with tepid enthusiasm from game developers who really prefer 191 00:13:44,399 --> 00:13:51,000 to Target the lowest common denominator ultimately led to the demise of consumer 192 00:13:48,839 --> 00:13:55,139 multi-GPU it's not that NVIDIA gave up without a fight though they actually 193 00:13:52,620 --> 00:13:59,100 quietly made an attempt to resurrect SLI in the RTX 2000 generation when they 194 00:13:57,420 --> 00:14:03,120 explored checkerboard frame rendering unlike split frame rendering we which 195 00:14:01,079 --> 00:14:07,920 would have both gpus contributing to each displayed frame but would often 196 00:14:05,279 --> 00:14:12,839 have an ugly scene down the middle CFR would divide the frame into small chunks 197 00:14:10,260 --> 00:14:17,339 for each card to render then composite the result into a single image in theory 198 00:14:15,720 --> 00:14:21,600 it could have been the best of all worlds and even avoid NVIDIA having to 199 00:14:19,680 --> 00:14:27,120 specifically optimize a given game for multi-GPU but they ultimately abandoned 200 00:14:24,899 --> 00:14:31,019 it for a few reasons first the processing overhead was significant 201 00:14:28,860 --> 00:14:36,480 which could increase latency and second DirectX 12's explicit multi-GPU model 202 00:14:34,139 --> 00:14:41,160 showed up around that time which handed multi-GPU control over to the game 203 00:14:38,519 --> 00:14:45,899 developer entirely offloading it from the driver which game developers 204 00:14:43,079 --> 00:14:51,120 obviously haven't done anything with but that doesn't mean the multi-GPU dream is 205 00:14:48,120 --> 00:14:53,639 dead and of all people it's Apple 206 00:14:51,120 --> 00:14:59,699 showing us the way you see the M1 series of socs has far more in common with our 207 00:14:56,940 --> 00:15:03,000 Quantum 3D brick than meets the eye have a look at these die shots and you'll see 208 00:15:01,139 --> 00:15:08,639 what I mean we could think of each of these GPU core blocks on the M1 Pro as 209 00:15:05,880 --> 00:15:13,139 similar to the GPU chips on our brick with a fast enough interconnect they can 210 00:15:11,040 --> 00:15:18,420 act as one to render a single output like we see in the M1 Max but then okay 211 00:15:16,680 --> 00:15:23,279 nothing that we're looking at here is really multi-GPU it's just a bigger 212 00:15:21,660 --> 00:15:27,959 single die GPU it's only when we move to the M1 Ultra 213 00:15:25,560 --> 00:15:35,100 that things get really interesting you see the 64 core GPU in the M1 Ultra acts 214 00:15:32,399 --> 00:15:40,320 for all intents and purposes like a single die solution but Apple disclosed 215 00:15:38,040 --> 00:15:44,220 in their launch event that is actually a dual die design that uses a 216 00:15:42,540 --> 00:15:52,260 game-changing packaging solution that they call Ultra Fusion so it's two gpus 217 00:15:47,420 --> 00:15:54,420 acting as one it's SLI but with 218 00:15:52,260 --> 00:15:59,399 absolutely none of the downsides how on Earth did they do it well you see the 219 00:15:56,760 --> 00:16:04,860 problem has always been the interconnect speed see traditionally once you go off 220 00:16:02,519 --> 00:16:09,120 a single die your bandwidth drops dramatically that's why NVIDIA couldn't 221 00:16:06,899 --> 00:16:14,699 achieve vram coherency across multiple cards via their SLI Bridges the links 222 00:16:11,760 --> 00:16:18,839 were just too slow it's also why tricks like split frame or alternate frame 223 00:16:16,980 --> 00:16:23,760 rendering have always been necessary they couldn't just pull together the GPU 224 00:16:21,839 --> 00:16:28,440 resources because the left hand would have no idea what the right hand was 225 00:16:25,260 --> 00:16:31,560 doing in real time but Apple did it and 226 00:16:28,440 --> 00:16:33,899 both AMD and NVIDIA have also talked 227 00:16:31,560 --> 00:16:39,120 publicly about the possibility of future GPU designs that use multiple chiplets 228 00:16:36,839 --> 00:16:44,339 with high-speed interconnects in order to economically scale performance it's 229 00:16:41,820 --> 00:16:50,940 coming back baby but how does this factor in well the thing is back in 1998 230 00:16:47,759 --> 00:16:53,940 the bandwidth requirements for inter-GPU 231 00:16:50,940 --> 00:16:56,279 communication weren't as high so your 232 00:16:53,940 --> 00:17:00,240 Ultra Fusion interface could look a lot more like this 233 00:16:58,560 --> 00:17:03,660 it's really funny isn't it how the more things change the more they stay the 234 00:17:01,860 --> 00:17:08,760 same just like I always do the same segue to our sponsor vessi it's 235 00:17:06,839 --> 00:17:12,000 springtime which means rain can still show up and ruin your day like an 236 00:17:10,439 --> 00:17:16,100 annoying neighbor but that's fine because hello we have Bessie shoes 237 00:17:13,860 --> 00:17:21,360 Bessie claims their shoes are 100 waterproof so we can go step into as 238 00:17:18,600 --> 00:17:25,260 many puddles as we want they're dymatex technology keeps their shoes light and 239 00:17:23,280 --> 00:17:29,220 breathable while still being stretchy and comfortable also all of their 240 00:17:27,240 --> 00:17:33,059 products are vegan and 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