PSU Chirping and Shutoff

[TheFuneral]

Hello guys,

I recently built a four gfx mining machine with 7970 Vapor-Xs and I'm hearing a chirp noise along with the system powering down. I assume this is because of my PSU? When I run the system with only three cards it stays on for days. When I put it on four cards it shuts down in hours.

PSU: http://www.amazon.com/gp/product/B00607JLWU/ref=oh_details_o05_s01_i01?ie=UTF8&psc=1
GFX: http://www.amazon.com/gp/product/B008PQAE98/ref=oh_details_o09_s00_i00?ie=UTF8&psc=1

Do you think it'd be smarter to buy a new PSU for the one extra GFX like http://www.newegg.com/Product/Product.aspx?Item=N82E16817151117 ?

Or should I attempt to sell my usd PSU for a 1600W one?

[Trillium]

Have you looked up the power draw on those cards and then estimated your PSU requirements for the rest of the PC with one of the PSU calculators? How does it compare to the PSU you are running? I'd recommend at least 20% extra (as a minimum, given the load you are running it at) to accommodate for lowering power output capability in the months/years to come. 20% should give you room for a year, if you are lucky, on whatever PSU you find you need to get to make the setup stable.

You could consider running two PSUs on the one computer. I'm sure you're not the first person to setup a rig like that around here.

You'd also do well to get a 92% conversion efficiency PSU next time, not a ~80%. If you work out the saving from that 12% at 1000 watts or more running 24/7/356... it's a lot of money.