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on september 17th 2020 claimed yet another victim now NVIDIA's sli

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technology which allows you to use more than one graphics card to increase your

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FPS in games was already on life support with

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lackluster support from game developers and NVIDIA slowly pulling support from

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more and more of their cards but the final nail in the coffin was of

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course this blog post on NVIDIA's website stating that they would no

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longer develop sli profiles for future cards at all or for their past cards

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past january of 2021 curiously though the rtx 3090 NVIDIA's

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latest and absolute greatest does have an nv-link connector which as

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of last generation is the connector that we use for sli

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which hasn't been explicitly disabled so

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theoretically in the handful of games that do natively support it we should be

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able to run sli on this card

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raising the question of course given how CPU bottlenecked this is on any kind of

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mere mortal monitor will a second rtx 3090 even make any difference i

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legitimately don't know i have intentionally cloistered myself and not

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looked at anyone else's videos on the subject

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just like i haven't looked at who's our sponsor

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ah there it is ridge wallet ridge wallet wants to redefine the wallet with its

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compact frame and rfid blocking plates check out how they can keep your wallet

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bulged down and use offer code Linus to save 10 and get free worldwide shipping

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as much as i would have loved to throw two of NVIDIA's chungus founders edition

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rtx 3090s in here and see just how well

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this through card blowy thing works when you've got two of

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them stacked on top of each other i wasn't able to get another one of those

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so we're going with ASUS rog strix gaming rtx 3090 now i don't actually

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know much about this card other than that ASUS did apparently manage to dodge

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the whole fiasco with like bad board components causing crashes and stuff

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like that so uh good job jesus

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you're done good oh she's a heavy boy for sure so we've got

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a three fan configuration with counterflow so that's that this one is

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spinning clockwise the others are spinning counterclockwise something something turbulence we actually do oh

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that's interesting we do have a little bit of through the card blowiness here

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sort of it's a much more traditionally shaped pcb but the cooler actually

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extends for a that looks like a good couple of inches past the edge of the

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card now you might have noticed i didn't take the plastic peels off this one

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that's because this one's got to go back to ASUS funny story they were like

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uh hey be real careful with that one because it's literally the only one we

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have and we have to do some stuff with it you know the product is in shortage

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when even the manufacturer does not have any fun fact about our system configuration

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here the MSI z490 godlike was literally

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the only motherboard in our studio that was capable of handling this

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configuration not because we didn't have any other

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boards with four slot spacing which is what we need at least in order to have

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any room for the top card to breathe but because it was the only Intel based one

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that had that and trust me i love ryzen as much as anyone

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does at this point but if you're running two rtx 3090s you are going to need the

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fastest possible gaming CPU which for now anyway is the 10900k this is

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freaking nuts like look at this the whole the whole

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bottom of the case is full of graphics i love that these fans are

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going to be blowing right into this bottom card this one

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good shape for cooling this one

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well might be okay

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it's not really the best case for this but we're just gonna leave it open so it gets enough

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air flow uh hey we might have a slight problem

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yeah oh yeah we got four eight pin connectors

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and that's not enough today each of these needs three eight pin pci express

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connectors that has got to be overkill do you think the power supply will be

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good enough what's in here a thousand watt sea sonic i have my

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doubts it was able to run four gb 100s for

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months yeah i still have my doubts

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cable me

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nice catch this is NVIDIA's nv link bridge 4 slot

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for 30 series products yes my friend NVIDIA

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friend yeah i guess i don't have friends plural anyway yes my friend NVIDIA has

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changed the envy link connector again so

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it's basically you know one card one envy link connector this one is actually

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keyed differently and has i think double the bandwidth over the last one maybe so

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wait wait what point did nvlink replace sli in terms of branding

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it didn't sli was and continues to be

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the branding for multiple cards working together for

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gaming envy link is just the name of this

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communication protocol and connector which happens to be much much faster

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than the original sli finger and even the high bandwidth bridges that NVIDIA

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introduced later on the reason it was developed was not for gaming it was

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actually for their like ai and like data center products but if they were going

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to build this high speed interconnect you might as well put it on

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the gaming cards as well is what i'm assuming the thinking was nvlink is so

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much faster than the sli interface was that it can even allow their other cards

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to pool their memory together and work on much bigger jobs we actually talked

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about this in more detail in this video right here all right please tell me it's

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just going to boot up wow that is very sharp tv

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and NVIDIA control panel dual 4090s they

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show up sli boom there it is it may be dead but

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here's its shambling corpse with that out of the

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way let's have a look at the wide selection of sli ready games that we can

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enjoy shadow of the tomb raider civilization six sniper elite four gears of war four

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ashes is a singularity escalation strange brigade rise of the tomb raiders

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on beyond before dead war hitman deus ex mankind divided battlefield 1 and halo

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wars oh that's all the directx 12 ones also and here are some vulcan games with

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support including red dead redemption 2 and quick 2 rtx ashes of the singularity

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escalation stream brigade and zombie are before dead work

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dang it three of those are from the other list they just support multiple apis so

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installed on this system we have almost every sli capable game that is

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oh that is pretty rough looking where do you want to start should we go straight

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for one of my favorites shadow of the tomb raider sure but when we go for it

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we are going for it i'm talking 4k absolutely maxed

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everything except motion blur motion blur yeah there's actually a

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thing on the forum the other day talking about how people don't think that you

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should hate on motion blur so much really yeah i don't get it wow

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they are both at 90 plus percent that's pretty cool so

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did you can you know what no i don't wanna i don't wanna run the benchmark yet can i just enjoy it for a little

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yeah give her this is the kind of gaming setup that

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even ten years from now most people will have never experienced so i want to at

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least try it out that was some interesting flicker right

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there oh

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you piece of you knew that was gonna

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yeah that was so anticlimactic

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look how funny he thinks he is i even have it all set up

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no don't go away you're helping me plug these in i probably should have seen that coming

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something to note is that while a thousand watts is

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probably enough to realistically power these cards under a sustained load

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what's interesting about the rtx 30 series is that it can experience sudden

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spikes in current that can actually trip the over current protection of a power

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supply that on paper seems like it should be able to handle

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the load so for years NVIDIA and AMD

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both have been recommending power supplies that i would look at and i'd go

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ah you can get away with less than that but for the first time i would actually

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say you should probably go 20 over their recommendation to make sure

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that you don't experience something like that all right let's try this again

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and this game absolutely maxed out looks

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freaking incredible

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what's more surprising to me is the usage on these gpus both of them are

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above 80 usage that's crazy

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you can really hear them ramping up already even at our lowest dips we're not seeing

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any lower than 50 to 55 frames per second which

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especially on a g-sync monitor is gonna feel really fluid

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not quite as fluid as if you just had one GPU doing it though which is

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interesting and well part of why sli is dead now

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now to measure a little more objectively we're gonna let frame view run for 180

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seconds while the shadow of the tomb raider benchmark runs its course here and apparently i'll

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go have a quick meeting with nick light about our merch stuff lttstore.com

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look at this guy over there with the razor mask hiding in the shadows

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in the shadow of the tomb raider shady guy before the benchmarks done actually

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we've got a really good opportunity to check out our max power draw here

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because shadow of the tomb raider is consuming anywhere from 85 and 100

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percent of the gpus all the way to like 90 and 100 percent so i did say before a

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thousand watt was probably enough and it probably is remember that the power

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supply isn't quite 100 efficient even if

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it's 80 plus platinum or titanium and this is draw from the wall so

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realistically it's going to be somewhere in the 950 watt range right now that's right

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there's finally a system that actually needs a thousand watt power supply and

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more for the spikes you know alex hasn't even finished transcribing

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the numbers and i can already see the problem while our 90th percentile and

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95th percentile numbers are way higher

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than a single GPU it all falls apart in the 99th

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percentile so what that means is that 90 percent of the time sli is

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yeah damn near 70 faster than a single

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card but 90 of the time isn't what you

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feel when you're playing one percent of the time it dips down

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just as low which is exactly those little stutters that i was feeling when

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i was playing yeah there's the graph yeah there's the graph here's a graph

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for the well whatever we'll overlay it there's a graph you guys saw the graph

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already next game it's always interesting to see how

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gamescanned benchmarks can well disagree with NVIDIA's frame view

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tool this says 86 FPS minimum that

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sounds pretty good frame view says

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um 94 wait really yeah oh wow

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well that's great deus ex mankind divided if you're still

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playing this game sli rtx 3090 looking like a pretty good

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option while we fire up red dead redemption let's take a moment to

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appreciate the aura

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coming off of this machine so here we should move your laptop it's going to

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get cooked alex it's going to get cooked

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i want to yes before we get the thermal camera though i just want to show you

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guys where i can feel the heat of this machine from

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holy crap i think i can still feel it definitely here 100

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i mean it's a thousand watts it's like having a space heater on your

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table i should have half expected the next result to balance out that good one

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uh red dead redemption 2 just won't get past this black screen trying to load

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the game so so much for 15 of the supported games

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list to be clear there might be some way to get it working but we're not going to

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spend any more time than that and neither should you this is a really

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short benchmark apparently 30 seconds

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really hard to read frame view with the in-game stats all up in my business

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i just want to see how much usage there is

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okay the good news is it's working the bad news is i still can't see how much

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GPU usage is but that's okay because we brought the thermal camera

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wow that top card is definitely running a little hotter than the bottom one

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48.6 there got a a cool 65 on the top

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dang all right summary time that confirms

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what we thought we knew sli did nothing it actually made it

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worse yay sli what's next

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uh that's all that's as far as we got honestly i'm

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good with that um none of these other ones you know what

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let's just play quake 2 rtx for fun then

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what do you think the most overkill quake 2 machine of all time it's so warm

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all right so we've got eight freaking reflections how's our GPU

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actually not bad GPU two sitting at about eighty percent

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here ladies and gentlemen that's pretty cool ah

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please die please die is he dead i can't

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tell he did okay here we go

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oh come on i'm down to like 19 health

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i'm just gonna i'm running for it i'm running for it here boys i'm running for

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it we're going we're go get out of the way

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all right forget it i'm out but you should do the heat test you should do

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the heat test i can feel it from here like easily

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like flip your hands around now

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yeah that's what i thought

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let's have a look it's still maxed out at 10 22 in quake it's sitting at i'm

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gonna assume it's lower than shadow of the tomb raider i suspect it's not doing much on CPU 908 watts

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quite a bit you know what else is quite a bit

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your patience with my segways to our sponsors

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enjoyed this video and you love this kind of like graphics insanity maybe

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check out um i don't know we haven't shouted out in a

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while how about 16k gaming