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I have 4 x 7950 and when they mine bitcoin consumption from wall is around 850-900W depending on clocks, but when I tried scrypt on semi aggresive settings it pulled over 1000W from wall. So be careful when mining scrypt as it drains more power.
I managed to get 1-2 minutes of BTC mining before the unit blew it's guts... I noticed the hot card was only pulling around 590MH/s whereas the other card started @ 650MH/s. I would have tried scrypt mining but alas I didn't get a chance to before the PSU decided to fail.
It sounds like that card's the problem. I don't think it should hit 99C within seconds. I doubt the PS would cause that.
On idle, the top card was @ 47C and the bottom one 40C. Once I started mining, both began to increase temps as normal except that the top one jumped to 80C almost immediately while the bottom one was still at ~65C. Within say ~30 seconds the top card had hit 99C and the bottom card was just about to hit 75C before the system shutdown.
A PSU also should not be light. If you pick up a 900W power supply and it feels light it is probably crap. Pushing out high power takes serious components that have weight to em. I have found some off brand supplies that have done well, like Rocketfish. I get Rocketfish 900W supplies and treat them like 700W units. Out of 6, not have died over two years.
This one seems neither heavy nor light... Actually it feels lighter than it should be for what it's 'rated' at. My Lian-Li 650w has been going great guns and is rather heavier than this cheapo CoolerPower.
Without actually testing the hardware itself I couldn't tell you, but this really sounds like a capacitor blowing (which if the rest of the components did their job correctly, saved any hardware aside from the PSU from getting fried).
Looking through the vents on the PSU with a cree torch I can't really see any burning or blown capacitors tho I don't want to open it up just yet to really have a look before as it's going back to the store over the weekend.
As far as projects though, I am using one of their higher-end models. It might be overkill (for both my purposes and yours) but I would suggest at least checking it out - HCP-1000 Platinum. This particular PSU actually has 4 dedicated 12v rails in case you ever want to get crazy with more cards. A great thing too is it really is an investment product. All of Antec's PSUs come with a modular cable design, but this unit and a few others are actually future proof when it comes to the needs of motherboards and other hardware that has yet to be released. I've really thrown a lot at mine (more than I should to be honest, but I figure with a 7-year replacement warranty, why not? =p). Also since you'll likely be running your system 24/7, it's nice that it's 80 PLUS Platinum certified (that basically means that there is very little power that goes to waste due to heat or power leaks). Again, we're looking at an extreme version; but I would never buy a PSU that wasn't at least 80 PLUS Bronze certified. If you decide you need less power they have lots of different models with various features (what everyone recommended above is golden info)
Ultimately, I'd like more power... overkill or not I do have the 990FXA mobo and was thinking eventually to add more cards on powered risers but that idea is shelved for a while at least till I can sort out the current issues. This dodgy PSU is 80+ certified tho as with the rest of the info listed on the unit, I call BS
- This reminds me of an upgrade I done to my now defunct Compaq Presario some 7 or so years ago. I kept the PSU which was just a shitty 250W rated one but everything it powered (Intel e8400, 8GB Crucial Ballistix Tracer RAM few sata HDD) was running sweet as a nut. I threw everything at that system and it never skipped a beat... I've never had an issue with any Antec I've bought and still have a 350W SmartPower PSU that was running an old AMD Athlong 64 rig. I used it last night to trial the paper clip test with 
I'm thinking of grabbing either the HCP-1000, Seasonic X-1250 or perhaps Silverstone 1500w. The downtime on this rig atm is rather depressing mainly because I can't do anything really till I go back to the store and grab another PSU.
dude, NEVER FUCKING BUY a bargain priced PSU thats of no brand, especially a cheapass highwattage PSU..
Their a flatout lie, and yes they can get away w/ it for some reason legally...no fucking idea why, it should be fucking outlawed to lie that much to a customer.
But yes, manufactures often can fake the logos for many of the certifications they have to pass to be 'safe'
Such as UL etc...
There are cheap high watt PSUs all over the place that make me fucking pissed off. They can handle most like maybe 200watts when they are labeled 600+ watts.
On top of that .. the shit PSUs feed horrible quality DC to your PC components...causing all sorts of stress on their VRMs ... its a sad situation.
Their a flatout lie, and yes they can get away w/ it for some reason legally...no fucking idea why, it should be fucking outlawed to lie that much to a customer.
But yes, manufactures often can fake the logos for many of the certifications they have to pass to be 'safe'
Such as UL etc...
There are cheap high watt PSUs all over the place that make me fucking pissed off. They can handle most like maybe 200watts when they are labeled 600+ watts.
On top of that .. the shit PSUs feed horrible quality DC to your PC components...causing all sorts of stress on their VRMs ... its a sad situation.
Don't worry, I'm pretty pissed off myself... I mean I could have gone to the casino and blown 1k easily and probably got more in return than what is happening currently. I got the unit for $89 on sale, but it's $127 atm. It's the cheapeast purchase I've made on a PSU in my 20 or so years of building PC's. I was just a little retarded when deciding to buy it due to it being on sale at the time and that decision has probably cost me alot more than I'd bargained for... None the less, I've sent off an email to the store and await their reply heh.
