4 ms·
"No." DDR5-8000 is 64GB/s per channel. Desktop CPUs have two channels. PCI-E 5.0 in x16 is 64GB/s. Desktops have one x16.
by DiabloD3 1y ago
"No."
DDR5-8000 is 64GB/s per channel. Desktop CPUs have two channels.
PCI-E 5.0 in x16 is 64GB/s. Desktops have one x16.
- modeless 1y agoHmm, Intel specs the max memory bandwidth as 89.6 GB/s. DDR5-8000 would be out of spec. But I guess it's pretty common to run higher specced memory, while you can't overclock PCIe (AFAIK?). Even so I guess my math was wrong, it doesn't quite add up to more than memory bandwidth. But it's pretty darn close!
- DiabloD3 1y agoThere is a difference between recommended and max achievable. Zen 5 can hit that (and that's what I run), and Arrow Lake can also. The recommended from AMD on Zen 4 and 5 is 6000 (or 48x2), for Arrow Lake is 6400 (or 51.2x2); both of them continue increase in performance up to 8000, both of them have extreme trouble going past 8000 and getting a stable machine.
- pseudosavant 1y agoOne x16 slot. They'll use PCIe lanes in other slots (x4, x1, M2 SSDs) and also for devices off the chipset (network, USB, etc). The current top AMD/Intel CPUs can do ~100GB/sec over 28 lanes of mostly PCIe 5.
- immibis 1y agoBut my Threadripper has 4 channels of DDR5, and the equivalent of 4.25 x16 PCIe 5. You know what adds up to an even bigger number though? Using both.