Can I get away with a 750w PSU?

Silver_Pharaoh · Jul 12, 2016

On my folding server?

2x 280x (OC'd to 1050Mhz Core)
1x 3570K @ 2Ghz. (I will be undervolting this)
1x HDD
1x PCIe Wifi card
No keyboards or anything else.

Looking at 781 Watts according to the outervision PSU calc, and it's recommending an 830W PSU?
That seems a lot higher than it should... I thought the 280x's were 200 watts OC'd?

Lochekey · Jul 12, 2016

That calculator has issues sometimes.

I run 2 hd7970 and a 4690k all oced in my benching rig on a 750w psu without issue.

ATMINSIDE · Jul 12, 2016

500W of GPU, 77W of GPU... stock. Add 50W for the rest of the system.
Mild OC, I'd say you're around 700W worst case.

Silver_Pharaoh · Jul 13, 2016

So a 750w will do. Awesome!
Thank you guys! :thup:

Tír na nÓg · Jul 13, 2016

280x's are 250W TDP IIRC, as ATMINSIDE said. @stock.

1050 is a mild OC, if you are using stock voltage, you will be OK.

Silver_Pharaoh · Jul 13, 2016

Picked up an EVGA 750 GQ for it. So far so good!
Underclocked the 3570K to 1.6GHz to help reduce power draw where I can

Lochekey · Jul 13, 2016

Do you have a kill a watt meter, I would be interested to know what the actual draw is.

ATMINSIDE · Jul 13, 2016

Same!

Silver_Pharaoh · Jul 14, 2016

I dont, but i should be able to get the amperage draw which is just as accurate

Lochekey · Jul 14, 2016

That would work take. A voltage reading at the same time if possible.

JrClocker · Jul 14, 2016

And hope that the phase angle isn't more than 10 to 15 degrees...

Silver_Pharaoh · Jul 14, 2016

Voltage will be about 112v guaranteed. My line voltage is low sometimes

wingman99 · Jul 14, 2016

I would like to know also. My PC in my signature uses 291w at the wall running crysis3.

Silver_Pharaoh · Jul 15, 2016

Ill get the figures tonight. I was at a buddys house late last night.

I also installed the psu upside down..... The fan was completely blocked off. :shock:

Even then it was only exhausting warm air not hot air

Tech Tweaker · Jul 15, 2016

Don't know if my usage is similar to yours or not, but I was able to run a somewhat similar setup on a 650W PSU.

Intel i5 4690K
2x 8GB DDR3-1600
2x GTX 680's (195 Watts each IIRC)
1x 500GB SSD
1x 1TB HDD
10 fans (4 Gentle Typhoon AP-15's, 3 Corsair AF140L's, 2 Cougar CF-V12HB's, 1 NZXT FN-140RB)
Corsair RM650i 650 Watt

Under load (while gaming) I was maxing out at 400-425W at the wall (and system power usage was lower overall due to inefficiency).

While running Prime95 or Intel XTU I think the highest I got for the system overall was 200W total usage.

According to Extreme Outervision I should need a 700-750W PSU, but I never had any instabilities with a 650W one.

Silver_Pharaoh · Jul 15, 2016

Yeah the draw is similar. Im betting it'll be around 650 watts. Ill have the amperage reading tomorrow, currently at a buddys house for a friday night beer to end the week

Silver_Pharaoh · Jul 17, 2016

So it idles at .52 amps and runs at 3.03 amps.

62.4 watts and 363.6 watts loaded.
Not bad at all!!!

Core 0x21, Project 11706 GPU#1
Core 0x21, Project 10493 GPU#2

Lochekey · Jul 17, 2016

That puts it right about the sweet spot for psu efficiency curve.

wingman99 · Jul 17, 2016

That is good, plenty of head room for the 750w PSU.

Silver_Pharaoh · Jul 17, 2016

Yup, I measured again a few hours later, 2.99 Amps. Seems to stay around there.

So that means it only costs $36/month in power! :thup:

Can I get away with a 750w PSU?

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