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PCIe Gen 3 Boards can't handle as high GPU clockspeeds compared to Gen 4?

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so my 6900XT runs since 14 days at 2720 Mhz Target Clockspeed. (previously on a 5900X, B550 Strix F)

the Card was for around 60 Hours of Gaming in Use without a single crash.

now the Card is sitting in a Z490 Strix E and a Z490 Prime A. what i imediately saw is that even 2670 Mhz is barely stable for longer than 30-60 Seconds in a game. and i have to drop the Clockspeed down to 2600 Mhz to have the Card fully Stable again.

is that normal that maybe older Boards, PCIe controllers/switches or whatever can't run that stable with a Card like the 6900XT?
 
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my extreme 4 Z370 handles the newer pci4.0 cards fine. i dont know if thats old enough, but the only issues ive run in to is with the 3090 drawing more power than my Seasonic Focus+ 750W could manage , but thats a separate thing.
 
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so my 6900XT runs since 14 days at 2720 Mhz Target Clockspeed. (previously on a 5900X, B550 Strix F)

the Card was for around 60 Hours of Gaming in Use without a single crash.

now the Card is sitting in a Z490 Strix E and a Z490 Prime A. what i imediately saw is that even 2670 Mhz is barely stable for longer than 30-60 Seconds in a game. and i have to drop the Clockspeed down to 2600 Mhz to have the Card fully Stable again.

is that normal that maybe older Boards, PCIe controllers/switches or whatever can't run that stable with a Card like the 6900XT?

You switched from AMD to Intel. Completely different platform. Can't compare stuff like this with how the CPU and Motherboard interact with video card transactions.

Increase your VCCSA (System Agent voltage). Stock is 1.05v. You can go up to 1.35v safely on Z490. Experiment with values between that range. I saw a recent post from someone with a 6800XT who found that raising VCCSA allowed for higher overclocks.

No idea if this is a thing with Nvidia Ampere/Turing/Pascal cards or not.
 
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