Multi-rail issue?

[IIIIIIIIII]

Recently in my local community I've seen multi-rail PSUs (Enermax Platimax D.F.) shut down when paired with some Ampere GPUs.

 

One user used a 3080FE/3090FE with a 1050W Platimax. Both have been shut down.

Another user also used the 1050W Platimax. The 3090 Strix is not shut down, but the 3080ti TUF is.

 

Are there any other cases?

[IIIIIIIIII]

@jonnyGURU I've seen posts saying FTW3 and FE didn't work if the 12V rail was 40A or lower.(IIRC, HX Multirali mode, too)

On multirail, only the 3090 is having problems and the 3080 works fine?

[Guest]

And?

[Mason Peterson]

I've got a guy running a 8700K on a Z370 Killer SLI @ 5GHz and an Aorus Xtreme Waterforce 3090. Their CM MWE Gold 750w (V1) turned off with the 3090, but a Revolution DF 850w works just fine. Another one is running a moderate (~5-5.1GHz) overclocked 10900K with a 3090 FTW3 with ~2000MHz on the core clock on same PSU bought a few months apart. Neither have had any shutdowns.

Rail ratings for Platimax 1050w is 40A for 12V3 and 12V4 each. 1200w version trips at 52A per testing from Aris. You've got a 3090 pulling >40A through a single rail while neglecting the other?

 

Seems like something else.

[Guest]

33 minutes ago, Mason Peterson said:

I've got a guy running a 8700K on a Z370 Killer SLI @ 5GHz and an Aorus Xtreme Waterforce 3090. Their CM MWE Gold 750w (V1) turned off with the 3090, but a Revolution DF 850w works just fine. Another one is running a moderate (~5-5.1GHz) overclocked 10900K with a 3090 FTW3 with ~2000MHz on the core clock on same PSU bought a few months apart. Neither have had any shutdowns.

Rail ratings for Platimax 1050w is 40A for 12V3 and 12V4 each. 1200w version trips at 52A per testing from Aris. You've got a 3090 pulling >40A through a single rail while neglecting the other?

 

Seems like something else.

I've said it before, and I'll say it again....  the 3090 can spike as high as 875W for as short as 200 micro-seconds.  Some PSUs can handle that.  Some can't.