Do I have enough headroom for a 3090?

13oots2

13oots2

13oots2

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I have a 10980XE with a lot of drives and am overclocked to 4.7gHz on all cores, my power draw at the wall with processor is about 770W-780W CPU maxed out with a 1070Ti doing nothing. My PSU is a 1200W Zalman Acrux Platinum, that roughly leaves me with 420W to play with, power usage calculators seem to give me a green light with a 3090, am I cutting things a little close, or will I have to consider a new PSU or lowering my overclock?
 
13oots2 said:
my power draw at the wall with processor is about 770W-780W CPU maxed out with a 1070Ti doing nothing.
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Remember that you need to account for the inefficiency of the PSU. Platinum is 90% efficient IIRC so it's supplying a little over 700W. This leaves you 500W.

13oots2 said:
am I cutting things a little close,
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Possibly. You say your 1070 is idle but how many monitors is it running? Nvidia cards may not idle when multiple monitors are attached. Normally you would be fine but the 3090 is known for power spikes so you'll just have to suck it and see.
 
Quartz said:
Remember that you need to account for the inefficiency of the PSU. Platinum is 90% efficient IIRC so it's supplying a little over 700W. This leaves you 500W.



Possibly. You say your 1070 is idle but how many monitors is it running? Nvidia cards may not idle when multiple monitors are attached. Normally you would be fine but the 3090 is known for power spikes so you'll just have to suck it and see.
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Just the 1 monitor, so pretty much idle. Last time I sucked on a PSU, I got a nasty tingling sensation.
 
13oots2 said:
I have a 10980XE with a lot of drives and am overclocked to 4.7gHz on all cores, my power draw at the wall with processor is about 770W-780W CPU maxed out with a 1070Ti doing nothing. My PSU is a 1200W Zalman Acrux Platinum, that roughly leaves me with 420W to play with, power usage calculators seem to give me a green light with a 3090, am I cutting things a little close, or will I have to consider a new PSU or lowering my overclock?
Click to expand...
Reading this extract from a review, I’m not hugely confident in it:

In summary, the ZM1200-EBT is a competitively priced, fully modular PSU with very good overall performance. We feel that it will be enticing for users that are looking to combine value with aesthetics. The company covers it with a five-year warranty, which is acceptable for a high performance PSU nowadays. However, hardcore enthusiasts and overclockers that demand exceptional electrical performance and are indifferent about the appearance of the PSU are likely to look elsewhere.

/end of review

I’m not saying it will be a problem, it probably will work for a 3090Ti, but I prefer a PSU that has great reviews because then I know it should be more than ok.

Try it and if you find the overcurrent protection kicking in, swap it out immediately.

I got the SF750 because I know it can handle more than it’s rated power output and has excellent power delivery making it a very safe option for several upgrades .
 
The EBT is an entirely different lower tier PSU, I have the Acrux which has a 7 year warranty.

Any ways have bought a Thermaltake Toughpower Grand as I have another issue that needs addressing that could be PSU related, if not I have a backup that I can build a second PC out of.
 
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