Con,
Would that be OK for scrypt mining also?
I have 4 Sapphire 7970 OC with Boost and the only PSU available at the mo is a Seasonic X-1250W 80 Gold.
Dont want to knacker anything up, I would rather run 3 cards and be safe than risk it with 4 on LTC.
cheers,
Kev
Topic: 1Kw PSU apparently not enough juice for 2x7970's Ghz Editions... - page 2. (Read 28755 times)
Card #1 and Card #2 are the two I bought. Specifications list 600w for power requirement. I thought this was a mistake so went looking at the gigabyte website and it too lists the power requirement at 600w... Mind you AMD website states slightly different for the Ghz Editions listed below;
They did have another page which I can't seem to find now that stated 300w or so, which was kind of in line with the mining hardware comparison wiki chart. Tho I'm inclined to believe they were listing cards with lower clocks? Either way, I'm hoping I've just lost $89 in equipment rather than over 1K....
TBH, I almost always go for brand names, especially with PSU's. I really don't know what the hell I was thinking buying something that seemed suspect. One thing's for sure, I'm going to have a hard time explaining my stupidity to the sales team at the store when I go there tomorrow
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500W (or greater) power supply with one 150W 8-pin and one 75W 6-pin PCI Express power connector recommended8
850W power supply (or greater) with two 150W 8-pin and two 75W 6-pin PCI Express power connectors recommended for AMD CrossFire™ technology.
850W power supply (or greater) with two 150W 8-pin and two 75W 6-pin PCI Express power connectors recommended for AMD CrossFire™ technology.
They did have another page which I can't seem to find now that stated 300w or so, which was kind of in line with the mining hardware comparison wiki chart. Tho I'm inclined to believe they were listing cards with lower clocks? Either way, I'm hoping I've just lost $89 in equipment rather than over 1K....
TBH, I almost always go for brand names, especially with PSU's. I really don't know what the hell I was thinking buying something that seemed suspect. One thing's for sure, I'm going to have a hard time explaining my stupidity to the sales team at the store when I go there tomorrow
Not all PSUs are created equal. There is WILD variation in claims of what power they can produce and they don't measure them at meaningful operating temperatures, and they have multiple rails etc... I have an OCZ gold 1250W PSU and ran 4x7970s at average clocks of 1175 and it drew ~1100 watts at the wall and never skipped a beat.
Definitely need another PSU that's for sure but what I failed to read was the correct wattage specification for these cards.. I stupidly led myself to believe I'd be looking at between 250-300w per card when in actual fact it's 600w per card!
Correct, you'll need another PSU. Sorry to hear about your experience. Better go for a brand name next time. But 1000W is more than enough for 2*7970. Powerdraw is 250W per card at stock settings on my rig, what gave you the idea that it's 600W per card?
I think you had enough power, just PSU was bad...I had 2X7970s on 800/850W PSU running without any problems. Hope your vidcards are OK.
Recently built a mining rig and slapped in 2x7970's Ghz editions with the 1100/6000 clocks backed by what I thought would be ample power with a bargain buy Powercooler 1050w PSU. I almost shit myself when I fired up cgminer and seeing the top card's temp rocket within seconds to 99C before a loud pop and massive bright spark spewed it's way out of the exhaust of the PSU. The system switched off and isn't turning back on anymore. I'm worried that I might have fried something else aside from the PSU namely a card or two.... I tried the paper clip test on the PSU and yep she's dead as a door nail, wont turn on. Problem is my current desktop rig's PSU only has 2x6pin power plugs so I can't test the cards on it to see if they are still ok as they are 1x6pin and 1x8pin plugs each.
Definitely need another PSU that's for sure but what I failed to read was the correct wattage specification for these cards.. I stupidly led myself to believe I'd be looking at between 250-300w per card when in actual fact it's 600w per card! I really hope they are ok, they're only 2 days old, heck I could have even blown the mobo for all I know at this point - Woe Is Me!
Definitely need another PSU that's for sure but what I failed to read was the correct wattage specification for these cards.. I stupidly led myself to believe I'd be looking at between 250-300w per card when in actual fact it's 600w per card! I really hope they are ok, they're only 2 days old, heck I could have even blown the mobo for all I know at this point - Woe Is Me!
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