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so do you guys remember the last time there was a version 4.0 of something its

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creators envisioned running on nearly every desktop pc

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yeah me too but don't worry the subject of today's video isn't an ill-tempered

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web browser we'll be looking instead at pci express 4.0 the newest revision of

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the computer bus for your graphics cards and your high performance ssds

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and like the kind of bus that has tires PCIe 4.0 has been rather slow to roll

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its way into our lives the specification for version 3.0 came out all the way

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back in 2010 so why exactly has it taken so long

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well remember that PCIe 3.0 had a

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maximum speed of almost 16 gigabytes per

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second in each direction for its full-sized 16x link that is already

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blisteringly fast and the pci special

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interest group which develops the spec wanted to keep with how previous

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revisions doubled the speed every time

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so basically it took them a while to

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figure out how to force 32 gigabytes of data per second each way through the

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same interconnect and figure it out they did but what are

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the practical benefits i mean 3.0 has been doing just fine who needs

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that much speed unless they're doing literally nothing but moving 4k video

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around even modern graphics cards don't

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fully saturate a last gen pci express

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3.0 x16 link so is this more speed just

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for the sake of it well no actually

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because PCIe 4.0 can support so much

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data it may very well end up being helpful in the sense that it will free

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up pci express lanes allowing for more

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devices to connect without any of them being bottlenecked this is a major

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concern because even the latest high-end consumer cpus support just 20 or 24 PCIe

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lanes directly off the chip most of which gets immediately consumed

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by a graphics card leaving multiple devices competing for bandwidth on a

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PCIe communications hub of some sort

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so with PCIe 4.0 we could have things

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like high speed NVMe ssds and 10 gigabit

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Ethernet connections using just one lane

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each with nearly two gigabytes in each

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direction available to them so now then i can use the other lanes i freed up for

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more drives more high-speed usb i don't know but

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holographic interface card look look i can't predict the future

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and don't forget about notebooks

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Thunderbolt you know that super cool interface that can be used with external

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graphics cards also connects to the pci express bus

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as it stands today the ability to run a desktop graphics card outside of the

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chassis is pretty darn cool but

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we've observed some definite performance reductions when we've tested these kinds

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of setups so then with PCIe 4.0 higher speeds and

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lower latency the market for external GPU enclosures may get a little more

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vibrant if they can deliver the same or similar performance to what you'd get

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with the GPU actually sitting inside your computer and all of this ignores

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the data center where cloud applications for high-speed optane caches of your

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feed will help facebook load a delicious second faster and where scientists are

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using super computers with dozens or even hundreds of gpus for climate

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research and ai development all of those

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things are going to need faster PCIe connectivity too

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now of course only time will tell how relevant this new pci express revision

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will be but if the past is anything to go by we could end up seeing the first

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motherboards featuring PCIe 4.0 in mid

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to late 2018 so you'll be able to see for yourself

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with that said while the faster speeds may not be enough to get you to rush out

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and buy a new motherboard as soon as they drop it will be interesting to see

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how component manufacturers take advantage of the higher bandwidth if

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nothing else maybe we'll see an RGB expansion card with ai on board that

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proactively adapts the lighting to your mood

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speaking of being proactive are you finding yourself at the end of

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Techquickie in the how did you hear about us section

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so thanks for watching guys dislike like check out our other channels subscribe

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leave a comment if you have a suggestion for a future video i'm off just go away

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i actually have another video to film right now so i'm not going anywhere

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buy a gebo