Should I Choose PCIe 5.0 16x or 8x for Budget GPUs?

For the most part, lower-end GPUs don't suffer much from bandwidth limitations. They already require less bandwidth to function, so running them on 8 lanes of PCIe 5.0 is generally still sufficient for gaming without a major hit in performance.

Your comparison is spot on! The RTX 3060 and RX 7900 XT both run on PCIe 4.0 at 16x, which gives them the same bandwidth as the 5.0 at 8x. When comparing to higher-end models like the RTX 5090, the performance drop in those cards isn’t as pronounced because they don't saturate the bandwidth as much.

Yes, budget GPUs are more sensitive to these bandwidth issues for two main reasons: they typically have less VRAM, so when that runs out, they struggle. Plus, many users pair them with older motherboards that only support PCIe 4.0 or even 3.0, which exacerbates the bottleneck.

Weaker GPUs typically experience less performance loss. They generally won’t hit a bottleneck unless they run out of VRAM, which can lead to stuttering. So in most cases, you might not see much of a difference with 8x lanes for less powerful cards.

The key point here is that it really boils down to how often you’re transferring data over the PCIe bus. When GPUs run out of VRAM, they start pulling from system memory, which could be an issue. This is concerning for models like the 5060 and 5060 Ti that only have 8GB and operate at 8x, as they can really struggle in VRAM-limited situations. I’m glad I opted for the 16GB version myself.