Create an account to save your builds and preferences, or continue browsing as a guest
Quick Answer
No, you do not need to upgrade from PCIe 3.0 to 4.0 for gaming. Current GPUs including the RTX 4070 and 4080 show less than 2% performance difference between PCIe 3.0 x16 and PCIe 4.0 x16. Only the RTX 4090 at 1080p shows a measurable gap.
PCIe 3.0 x16 provides enough bandwidth for every current GPU except the 4090 at very high frame rates.
This is where PCIe generations matter more. PCIe 3.0 NVMe SSDs max out at ~3,500 MB/s. PCIe 4.0 SSDs reach 7,000+ MB/s. However, for gaming, the practical difference in load times is 1-3 seconds. The real benefit is for content creation file transfers.
Our Verdict
PCIe 3.0 is fine for current gaming GPUs. Do not upgrade your platform solely for PCIe 4.0 - the gaming difference is negligible. Only consider it when upgrading your entire platform for other reasons.
The main difference between B650 and X670 is PCIe lane allocation and USB connectivity. B650 has fewer Gen5 lanes and USB ports but costs $100-200 less. For gaming, B650 is all you need. X670 only makes sense for multiple Gen5 NVMe SSDs or extensive USB peripherals.
Yes, if your old PSU is 650W or higher, 80+ rated, and has at least one 8-pin PCIe connector. The RTX 4070 draws only 200W and uses a single 16-pin connector (includes an 8-pin adapter in the box). Quality PSUs from 2018+ should work fine.
You do not strictly need a PCIe 5.0 (ATX 3.0) PSU for the RTX 4080, but it is recommended. ATX 3.0 PSUs include a native 12VHPWR connector, eliminating the need for adapters. They also handle power transients better, which matters for high-end GPUs.