Possible PSU issue - resolved
Possible PSU issue - resolved
Now?.....nothing.
When I first proposed it, I thought it was just a test to check for differences.
The RAM is a short-term fix to make the machine functional until a permanent upgrade can be made.
TeamGroup Vulcan 16GB (2x8GB) DDR5 PC5-41600C40 5200MHz Dual Channel Set
For the power supply: Corsair HX1500i 1500W Modular 80+ Platinum PSU
Sooooo, it turned out to be the riser cable I used for vertical mounting that caused the issue. Even though it should have worked with an older 1080 and my current setup, it didn't function properly. I'm still trying to figure out why this matters. Edit: Gen 3.0 riser cable on a gen 4.0 GPU on a gen 5.0 board side socket seems problematic.
It seems you might need a Gen 4 riser cable, though I'm uncertain. All PCIe 3.0 through 5.0 devices, slots, and hardware are designed to be backward and forward compatible. Probably the best approach is to test it, as I haven't encountered any such requirement before. However, most systems don't rely on riser cables either.
As with you, it's not something I've ever heard of, but then again, it's not something I've gone looking for to hear of either. All I know is removing the riser solved the issue. I am 99% certain the card itself isn't the issue as it would work on my previous board with the riser fine. Strangely enough though, on the new board the riser didn't cause an issue when paired with an older 1080, that only leaves the combination of the 3080/riser/new board being the issue.
Obviously the only component removable from that is the riser.
I will keep a close eye on the RAM as well though, although the board does seem to recognise it is EXPO as the bios loads a DOCP profile when it's fitted, and when I tried the replacement RAM it loaded an XMP profile. And the only information I can find regarding compatibility from Asus and Corsair is when running on an Intel platform it may not give the absolute max performance it would on an AMD platform, which does seem to mirror the fact that the BIOS recognises it as 5200, as does Windows, yet CPU-z says it's 4800.
Either way, it's an upgrade over my previous, so as long as it continues to run stable, I can live with it. I will eventually replace it, once I've decided if my goal of 128GB is worth the tradeoff of the board/CPU only able to run that amount at substantially slower speeds. I'm leaning towards it not being worth it, but that's another discussion.