what if you had a 2 terabit per second link inside your home PC that's what's
coming down the road with PCI Express 7.0 which will deliver 256 GB per second
of bandwidth in One Direction on an x16
link by contrast to the PCI Express 4.0
slots that many of you have in your computers today only support an eighth
of that but even those current speeds have no problem supporting the bandwidth
needs of an RTX 4090 So What on earth do
we need eight times as much for and how do they keep cramming more speed into
those little slots anyway to start PCI Express 7.0 uses the same Pam 4
signaling seam that was introduced with version 6.0 we explained it in a bit
more detail in that video but long story short Pam 4 uses four voltage levels
rather than two to encode data meaning it can send two bits per cycle instead
of the usual one but if it uses the same encoding scheme how is it double the
speed well the answer seems fairly straightforward a doubling of the
frequency however when you're pushing that much data down the pipe at once
maintaining good signal Integrity becomes a real challenge you can't just
go around having errors left and right PCI Express 6.0 introduced some error
correcting features alongside Pam 4 so that it would actually be you know
usable but at the speeds PCIe 7.0 is
trying to push manufacturers will likely have to make improvements to the actual
physical layer this could take the form of anything from better materials like
more robustly built pcbs to Optical
solutions that offer better signal Integrity than copper in fact the PCI
special interest group or PCI Sig an industry Association that's responsible
for developing the PCI Express standard has already formed an optical workg
group to make sure the PCI 7.0 spec as
well as future revisions will actually be feasible this even includes using
full-on cables instead of copper traces in some situations but why is there a
need for that much bandwidth we'll tell
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PCI Express 5.0 X4 ssds that you can
actually go and buy right now you're already getting up to 16 GB per second
of speed in One Direction and there's a good chance you already know even
high-end modern graphics cards aren't suffering because current PCIe revisions
on motherboards are fast enough to not cause bottlenecks this means that PCIe
7.0 will initially be aimed more at data
centers for example making 800 GB Ethernet more accessible is a major goal
of the PCI Sig and it hopes to do this with PCIe 7.0 although you likely aren't
going to be running Ethernet speeds of that magnitude in your home rig anytime
soon connections that fast are going to become important for allowing data
centers to support all the load we're putting on them with cloud and AI
applications whether it's something straightforward like simply being being
able to deliver tons of highres video at once or GPU frames for cloud gaming
services or more complex stuff like AI for self-driving cars language
processing or medical Diagnostics and Ethernet isn't the only connection type
that PCIe 7.0 can help enable there's also a standard called compute express
link or cxl which runs on top of the PCIe physical layer and can be used for
a large number of use cases notably adding more RAM with the applications we
mentioned demanding not just more speed but also more memory capacity cxl over
PCIe 7.0 looks to become an easy way for data centers to significantly increase
how much RAM they can fit into a server we likely won't see products featuring
PCIe 7.0 until the latter part of the decade probably 2027 at the earliest and
if you're waiting for a PCI 7 SSD to pop into your PC it will likely be even
longer than that which is unfortunate for those of you who are very concerned
about saving an extra second or two on load times in your favorite game but you
know what that's a great time to pet the cat stop ignoring the cat it's a living
being it needs love but I love that you
watch this whole video thanks for that like the video if you liked it dislike
it if you disliked it check out our video on PCI Express 6 comment below
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