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.
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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.
