Z790 taichi lite Gen5 M2 and RTX 4080 Super

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   I received my ASRock motherboard and other components arriving over the weekend to start my build. Upon reviewing the instruction manual, if

M2 2_1 is used, then PCIe #1 is downgraded from PCIe 5.0x16 down to 5.0x8. or...

If I use M2 2_2 then my Gen5 M2 drive gets bumped down from Gen5x4 to Gen4x4 (128Gbs to 64Gbs).

Where will I see the biggest sacrifice on performance between scenario 1 vs. 2 above? some are saying scenario 2, but others say 5x8 (4x16) doesn't fully utilize the bandwidth of 5x16 and I'd see about a half second difference. 

Components:
ASRock Taichi Lite Z790
Gigabyte 4080 Super (refresh of 4080)
Crucial T700 Gen5 1TB

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domerdel Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 29 Feb 2024 Location: California Status: Offline Points: 20	Post Options Post Reply Quote domerdel Report Post Thanks(0) Quote Reply Topic: Z790 taichi lite Gen5 M2 and RTX 4080 Super Posted: 29 Feb 2024 at 9:58am
	I received my ASRock motherboard and other components arriving over the weekend to start my build. Upon reviewing the instruction manual, if M2 2_1 is used, then PCIe #1 is downgraded from PCIe 5.0x16 down to 5.0x8. or... If I use M2 2_2 then my Gen5 M2 drive gets bumped down from Gen5x4 to Gen4x4 (128Gbs to 64Gbs). Where will I see the biggest sacrifice on performance between scenario 1 vs. 2 above? some are saying scenario 2, but others say 5x8 (4x16) doesn't fully utilize the bandwidth of 5x16 and I'd see about a half second difference. Components: ASRock Taichi Lite Z790 Gigabyte 4080 Super (refresh of 4080) Crucial T700 Gen5 1TB

ASRock_TSD Members Profile Send Private Message Find Members Posts Add to Buddy List ASRock_Official Joined: 20 Mar 2015 Status: Offline Points: 8532	Post Options Post Reply Quote ASRock_TSD Report Post Thanks(0) Quote Reply Posted: 05 Mar 2024 at 4:38pm
	Hi domerdel, Thank you for your post. This depand on your monitor, if your monitor is 4K, then the method 2 is better. Under 4K resolution, RTX 4090 will get about 1-2% loss in the Gen4x8 mode (RTX40 series support PCIE 4.0 only). So I think RTX 4080 Super is less affected. Performance loss is related to resolution. With the 1080P monitor, you will gets up to 15% performance drop. All the best ASRock TSD

mikeharing72 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Mar 2024 Location: Austin Status: Offline Points: 30	Post Options Post Reply Quote mikeharing72 Report Post Thanks(0) Quote Reply Posted: 12 Mar 2024 at 11:25pm
	Exciting build ahead! Both scenarios involve trade-offs, but it depends on your usage. If speed is crucial, sacrificing PCIe bandwidth might affect performance more noticeably come into https://photocall-tv.com/. However, if you're not pushing the limits, the difference might be minimal. Consider your priorities and usage to make the best decision.