ATI 7990 - PSU ?

p0wp0w

Hello boardsies,

I'm looking to add an ATI 7990 to my current setup.

In future, I may want to add a second one.

Unfortunately I know little / nothing about hardware and building - I'm more knowledgable in the area of software / distributed systems.
I'm a little lost here.


Heres what I have / where I'm at -

MOBO - ASUS P8Z68-V LX S1155 Intel Z68
1 x HDD , 1 x SSD
CPU - Core i5-2500K 3.30GHz S1155 6MB
OPTICAL - DVD-RW
RAM - Corsair 16GB (4 x 4GB) XMS3 DDR3 1333MHz
Case (Pretty crap) - VSK 1000 Cost-Efficient Mid Tower Case
Generic 500W PSU - having issues with this , installing the one mentioned below


Corsair 430W Builder Series CX 80+ Bronze ATX Power Supply (Yet to be installed).
Arctic Cooling Freezer 7 Pro Rev.2 CPU Cooler (Yet to be installed).

Is there anyway to run these cards on less power while squeezing as much performance out as possible (think price/power ratio rather than gaming performance).

Luck100

I think the 7990 might be the most power hungry card out there. It's dual gpu on a single card. You'll need a better power supply than 430 watts. If you want to run on less power that's not the card for you.

Twothirdsoff

That GPU can use up to 375W, there's absolutely no way a 430W PSU is sufficient. Fill in your details to a PSU calculator and find out but off the top of my head I'd be looking at 600W minimum.

Wonda-Boy

There is no way in hell you would run 2 7990's in a rig....total overkill. You would need a coal burner out the back to power them! You would need a very good make of PSu to power a single 7990. I have the 6990 and its hungry but a very very good card. I would be looking at a top brand 600w bare minimum but 800w for piece of mind.

marco_polo

Yeah honestly you aren't even going to power one with that PSU so don't try or it will almost certainly pop under load. Just sell it and put it towards get minumum 650-700W for one 7990 (for comfort so the PSU won't be too near 100% load while gaming), and 1000W if you are planning on dropping two in there.

http://www.anandtech.com/show/6915/amd-radeon-hd-7990-review-7990-gets-official/16

Gumbi

If you want to save some cash http://www.overclockers.co.uk/showproduct.php?prodid=GX-327-AS

There were selling for as low as 400 pounds recently, but I doubt we'll see them again that low.

p0wp0w

I should have been clearer in my original post.
I'm not crazy enough to think that a 430W PSU will run this :-).

What happened was, I had purchased the 430W as a replacement for the crappy 500W generic PSU.
Now that I'm looking at this card (potentially two of them), I'm looking for advice on the PSU that would be required in both cases (with 1 and 2 7990's). I will be using them to mine litecoin - not for profit (I'm not that crazy either).

I'm guessing that another obstacle here might be cooling / case - if anyone has any suggestions on that I'd be interested be hear.

smileyj1987

http://www.tomshardware.com/reviews/radeon-hd-7990-crossfire-overheat,3539.html

The only way I would get them in crossfire is if I had a case with great airflow or liquid cooling . They do run hot and they don't vent the hot air out the back of a case like alot of gpu's .

Also for your PSU I would seriously consider something in the 1000 watt range .

Luck100

If mining litecoin is your goal, you might want to take a look at some other gpu options and rank by flops per watt. From what I understand your electricity bill will be the important cost factor, not a few euros more or less on the gpus, psu, or case.

After bitcoin got popular some of the gpu reviews started including hashing benchmarks as that's well correlated with performance on bitcoin mining. I assume same for litecoin? So your metric should be hashing ops / watt consumed. Probably that means you also don't want any extreme overclocking either as ops / watt gets worse.

dwighet

Corsair ax 1200 watt for sure...
I wouldnt look at anything else for 2 x 7990

Rob2D

Wonda-Boy wrote: »

There is no way in hell you would run 2 7990's in a rig....total overkill.

I plan to add another 7990 in my own rig in the new year for the laugh. With that idea in mind I was sure to get myself a ax1200i. Shur we only live once:pac: