RTX 5000 series question

[nub]

If I get RTX 5000 series for a PCIe slot 3.0, how much less performance do I get?

[Illusion of Progress]

In most scenarios, it will basically be a rounding error/margin of error difference between the latest few PCI Express versions, at least on graphics cards which use the full 16 lanes. It won't be an across the board performance difference. Games almost never need all that bandwidth (it's largely used for the CPU to send instructions to the GPU) unless you run out of VRAM and it starts needing to use that bandwidth for GPU to system RAM communication.

However, there will be a performance loss for a PCI Express 3.0 system, but it won't be from the lower bandwidth capability of PCI Express 3.0 itself, which the GPU will almost never need, but instead it will be from whatever CPU you have.

Since the lowest end RTX 50 series GPU out now is the RTX 5080, and the fastest PCI Express 3.0 CPUs are, what, the Intel 9th/10th generation CPUs (?), I'd say you're going to lose more performance from your CPU. Unless you're asking about the upcoming RTX 5070/5070 Ti, which may be a bit better on such CPUs.

[Rumpelcrutchskin]

Better question to ask would be if your CPU is good enough for it to run without heavy bottlenecking. If it`s PCIe 3.0 then the CPU is not exactly modern either.

[A&A]

The difference is very small.
At least for RTX5090 for now.

[Bad 💀 Motha]

I wouldn't bother. It would be like putting RTX 30 or 40 series GPU into PCIE 2.x slot based config. PCIE 3.x had quite a long life though. But even a 9900K wouldn't be good enough for RTX 50 series GPUs.

The oldest CPU I can see that would be OK would maybe be 12th Gen i7

[Komarimaru]

Thus far little difference. When was testing games, I found only one was affected, Horizon Zero Dawn Complete Edition(Before the Remaster). This was on an Gigabyte Aorus Master 5090. I didn't really test the 5080's, probably should have checked that, but customers wanted their PC's finished, so that came first lol.