Sponsor: Montech Sky One Lite on Amazon https://geni.us/sux2 This testing is for PCIe generations on the NVIDIA RTX 4090 GPU. We're benchmarking PCIe 3.0 x16 vs. PCIe 4.0 x16 vs. PCIe "5.0" x16 (but the 4090 doesn't support 5.0, so it's just 4.0 -- still worth showing for educational purposes). Remember that PCIe 3.0 x16 is equal to PCIe 4.0 x8, so if you're wondering if the RTX 4090 behaves differently on PCIe 4.0 x8 vs. x16, these two tests would answer that. We're doing testing on an Intel i7-12700KF, which is Gen5-ready but again, if the device isn't Gen5, that doesn't matter. If you're wondering about AMD vs. Intel for the RTX 4090, strictly from a PCIe standpoint, it doesn't matter at this point -- they're the same in that regard. Other factors are more important, like CPU performance in the applications you run (see our CPU reviews for that). One correction of an off-hand remark at 4 minutes 25 seconds - the RX 6500 XT has 4 PCIe lanes (Gen4), not 8. We forgot how much of a piece of trash that card was, sorry. Our mistake for not double-checking. Watch our video about the melting RTX 4090 12VHPWR cables here: https://www.youtube.com/watch?v=EIKjZ1djp8c See our RTX 3080 PCIe scaling video here: https://www.youtube.com/watch?v=0DKVVtirNM8 The best way to support our work is through our store: https://store.gamersnexus.net/ Like our content? Please consider becoming our Patron to support us: http://www.patreon.com/gamersnexus TIMESTAMPS 00:00 - PCIe Bandwidth Testing 01:15 - Explaining PCIe Support 04:25 - Correction: 6500 XT has 4 lanes, not 8 04:58 - Maximum Theoretical Bandwidth 05:50 - Benchmarking PCIe Bandwidth (Only) 07:23 - Total Warhammer Gaming Benchmarks (4K) 08:08 - Major Outlier with Interesting Results 09:28 - Tomb Raider - 4K & 1440p PCIe Bandwidth Results 10:05 - FFXIV, Rainbow Six Siege (4K, 1440p, 1080p), & Strange Brigade 11:14 - Conclusion ** Please like, comment, and subscribe for more! ** Links to Amazon and Newegg are typically monetized on our channel (affiliate links) and may return a commission of sales to us from the retailer. This is unrelated to the product manufacturer. Any advertisements or sponsorships are disclosed within the video ("this video is brought to you by") and above the fold in the description. We do not ever produce paid content or "sponsored content" (meaning that the content is our idea and is not funded externally aside from whatever ad placement is in the beginning) and we do not ever charge manufacturers for coverage. Follow us in these locations for more gaming and hardware updates: t: http://www.twitter.com/gamersnexus f: http://www.facebook.com/gamersnexus w: http://www.gamersnexus.net/ Host, Testing: Steve Burke Video Editing: Mike Gaglione, Andrew Coleman