Maybe it tries to get Gen 4 speeds over those cables and then errors out?
Maybe UPS overload?
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probably the best thing to do is to test every part individually.
I think that’s been asked twice, after it being in OP.
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Maybe UPS overload?
I don’t think so. The UPSs don’t beep, and the readout on the screen is well below their max capacity during the boot up.
Maybe it tries to get Gen 4 speeds over those cables and then errors out?
I have it set to use Gen 3 in the BIOS, but I’m going to try Gen 4 cables. I don’t think it’ll work, but I’m running out ideas.
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It’s possible to have a brief spike that doesn’t read on a display. There’s nearly always some short term averaging happening with monitoring.
Hmm, well I suppose it’s worth a shot. I’ll hook up the two 6-pins to a 5th PSU to see what happens.
For what it’s worth, I have also booted the machine without the GPU plugged into the mobo (the GPU that is on the PSU that powers the mobo).
Long shot (and hard to test):
The primary PSU gets to “power good” before the others do, the auxiliary PSUs then get loaded before they are ready for it.
Could try “jumping” janking the auxiliaries:
The less jank way is to get some of these:
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First thought is the Risers, try upgrading them to at least pcie gen 4 risers and see what that does. I’ve had bad experiences with pcie risers in general but might try again with them after about 2 years for my A770.
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Well the good news is that the 7 GPUs appears to be possible with the gen.1 version of the SAGE motherboard as per Puget:
Some long shot ideas to try that I didn’t see above.
- Make sure Fast boot is off in the BIOS, there is also a setting to add some extra time in the section.
- Turn off all the powersupplies before rebooting to ensure that the system does a full “reset/training” upon booting.
- I don’t think it’s the case here, but I’ve had issues in the past where the jumper wire gets loose and consequently one of the power supplies doesn’t turn on. A bit of electrical tape can take this out of the equation.
- Make sure the onboard VGA DIP switch is turned off on the motherboard.
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From Zotac page :
- Recommended Power Supply: 1000W
If they recommend 1KW for one card, them you might be under-powered.
- Can you get a single 8KW PSU?
- (Have doubts about daisy-chaining smaller PSUs, if not designed for that use.)
- Can you get a 8KW UPS?
- Suggest a “continuous conversion” UPS.
- Protects against “brown-out” if wall-circuit cannot meet power peaks.
Just a guess, the above.
I was just reading this post for the fun / porn. I was woundering, This single pc, is equal in compute with a Super Computer from how long ago ?
4090 = 83 Tflops
IBM Blue Gene / L 2004 - 2007
looking at the motherboard manual.
it supports up to 4 gpu’s on its 7 pci-e slots.
so if you managed to get 7 working before then its probably down to not having a micocode update installed.
when it was finally installed 7 gpu’s stopped working.
or it could be something as simple as a bios/eufi setting.
That applies to non-ATX 3.0 power supplies, which aren’t built to deal with the high transient power spikes in recent generations of cards. That’s also for total system power. With just two GPUs per 1500 watt power supply that should be fine.
Also OCP is generally +20-40%, so add another 300-600W to get an actual overpowered circuit trip.
I don’t have 7 Gen 4 risers, but I did manage to get 3 hooked up, and it didn’t make a bit of difference.
I also put the two 6-pins that are on the side of the mobo on their own 1300W power supply. So the PSU that was powering a single GPU + the entire mobo wasn’t using as much power.
I did notice that when I hook up 7 GPUs, it shuts off quick. If I hook up 6-GPUs it lasts a bit longer, if I hook up 5, it’ll last longer (even POST), still shuts off shut off before making it into windows though, then once I have 4 GPUs, it fully works.
Yeah, I bet you need to talk to Asus about it.
I’ve been doing some more testing/thinking on this, and I’m wondering if the power requirements for 5+ cards is just too much for the mobo to handle. As many have mentioned each card draws up to 75W per card. So Perhaps the two 6-pin connectors on the side just aren’t enough to power 5+ cards.
Is there any product out there that lets me give power to the PCIe connection from the power supply instead of the PCIe cable delivering it from the mobo. I’m thinking something that goes in between the riser and the GPU that I can plug in a 6-pin from the PSU. In other words, Mobo > Riser > [Alternate Power Thing] > GPU
(Still working on talking with ASUS)
Yes, there is a Gen3 cable that can supply extra power to the GPU:
adt.link/product/R33V42-Shop.html order "R33SL-BK-4.0 and add a note “R33SL-BK-PW-4.0”, which is a PCIE gen 4 riser with additional power connector. Source: reddit
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