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so do you guys remember the last time there was a version 4.0 of something its
creators envisioned running on nearly every desktop pc
yeah me too but don't worry the subject of today's video isn't an ill-tempered
web browser we'll be looking instead at pci express 4.0 the newest revision of
the computer bus for your graphics cards and your high performance ssds
and like the kind of bus that has tires PCIe 4.0 has been rather slow to roll
its way into our lives the specification for version 3.0 came out all the way
back in 2010 so why exactly has it taken so long
well remember that PCIe 3.0 had a
maximum speed of almost 16 gigabytes per
second in each direction for its full-sized 16x link that is already
blisteringly fast and the pci special
interest group which develops the spec wanted to keep with how previous
revisions doubled the speed every time
so basically it took them a while to
figure out how to force 32 gigabytes of data per second each way through the
same interconnect and figure it out they did but what are
the practical benefits i mean 3.0 has been doing just fine who needs
that much speed unless they're doing literally nothing but moving 4k video
around even modern graphics cards don't
fully saturate a last gen pci express
3.0 x16 link so is this more speed just
for the sake of it well no actually
because PCIe 4.0 can support so much
data it may very well end up being helpful in the sense that it will free
up pci express lanes allowing for more
devices to connect without any of them being bottlenecked this is a major
concern because even the latest high-end consumer cpus support just 20 or 24 PCIe
lanes directly off the chip most of which gets immediately consumed
by a graphics card leaving multiple devices competing for bandwidth on a
PCIe communications hub of some sort
so with PCIe 4.0 we could have things
like high speed NVMe ssds and 10 gigabit
Ethernet connections using just one lane
each with nearly two gigabytes in each
direction available to them so now then i can use the other lanes i freed up for
more drives more high-speed usb i don't know but
holographic interface card look look i can't predict the future
and don't forget about notebooks
Thunderbolt you know that super cool interface that can be used with external
graphics cards also connects to the pci express bus
as it stands today the ability to run a desktop graphics card outside of the
chassis is pretty darn cool but
we've observed some definite performance reductions when we've tested these kinds
of setups so then with PCIe 4.0 higher speeds and
lower latency the market for external GPU enclosures may get a little more
vibrant if they can deliver the same or similar performance to what you'd get
with the GPU actually sitting inside your computer and all of this ignores
the data center where cloud applications for high-speed optane caches of your
feed will help facebook load a delicious second faster and where scientists are
using super computers with dozens or even hundreds of gpus for climate
research and ai development all of those
things are going to need faster PCIe connectivity too
now of course only time will tell how relevant this new pci express revision
will be but if the past is anything to go by we could end up seeing the first
motherboards featuring PCIe 4.0 in mid
to late 2018 so you'll be able to see for yourself
with that said while the faster speeds may not be enough to get you to rush out
and buy a new motherboard as soon as they drop it will be interesting to see
how component manufacturers take advantage of the higher bandwidth if
nothing else maybe we'll see an RGB expansion card with ai on board that
proactively adapts the lighting to your mood
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