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I tried that too, just trying another graphics card now which doesnt need any additional power to rule out card, which was fine in old pc, i had taken expo off to back to stock settings, next will be changing the PSU over, I have exactly same one in another pc.Do you have EXPO enabled? If so may be worth trying with stock settings.
Does sound like the PSU if using different cards that require less power or no extra power at all.I tried that too, just trying another graphics card now which doesnt need any additional power to rule out card, which was fine in old pc, i had taken expo off to back to stock settings, next will be changing the PSU over, I have exactly same one in another pc.
Update:-
Okay, so i tried 2 old graphics cards in this PC, a Nvidia 970 and a Nvidia GT710 ( last one requires no power connectors), and they work fine, So can we all agree it must be a PSU issue?, before I spend the bucks
Is it worth trying my other PC power supply which is the same one but a newer version of it.
Only other thing I havent done is updated the bios, but I don't think that's an issue.
We can all agree that the PC Parts I brought all fine.
I would then look at getting a new PSU or seeing if you can borrow a different PSU which is a different brand\higher wattageI can confirm it is 2 seperate leads from the PSU directly, not daisy chained or shared.
I have just bought this PSU at Christmas for my 9800X3DAnyone recommend me one?
I have been using Corsair for quite a few years now, what wattage you suggest?
My current is 750w
I do have 2 ssd's a hdd, a noctua and amd 6800xt.
New psu time by the looks of it mateI can confirm it is 2 seperate leads from the PSU directly, not daisy chained or shared.
Had issues with the 3090 and an EVGA PSU. Was more than the recommended, but the spikes on 3090 was an issue for a lot of good PSUs. Moved to Seasonic since then. Superb PSUs.This is not really related to your specifics OP, but.....
I had a Seasonic Ultra Titanium PSU at 750w. All was well. Bought a 3080Ti. Ok the dots are there, as I joined them.
But, it took some tome to figure out the transient spikes of power demands from that GPU was causing the PSU's OCP to kick in and switch off the PC.
At the time the "transient spike" issues were somewhat unknown.
Seasonic just changed / upgraded the PSU for me to a different model with more suitable OCP built in.
For me in that situation, it was the OCP of the PSU just doing its job, but not allowing what that particular cards, and others at the time, were causing.
Had issues with the 3090 and an EVGA PSU. Was more than the recommended, but the spikes on 3090 was an issue for a lot of good PSUs. Moved to Seasonic since then. Superb PSUs.