this post was submitted on 12 Jan 2025
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Unless you're getting a 5090 the pcie bottleneck should be negligible compared to your CPU or other things.
On pcie 3 the 4090 gets about a 5% performance penalty. I'd assume the 5080 is about the same performance as the 4090 so the hit should be similar. Unless you're like me with a 5800x3d on a garbage B450 motherboard your CPU is probably going to be holding you back so much more than the pcie version.
The only caveat to that is that the card must be using x16 bus speed for the negligible impact, which only the high-end cards reliably do. A bunch of the 70 series and under cards are actually x8 bus speed, and then pcie 4 actually matters. ~20% vs 5% performance loss for 8x bus cards over pcie 3.
My guess is that if a 4090 is bottlenecked 5% on pcie 3.0 (although I think it's closer to 10%). Also if pcie 4.0 is double the speed as 3.0, and pcie 5.0 is double 4.0. Then the bottleneck will be closer to 10% if running a 5080 on pcie 3.0.