Hello , Ok for the last 4-5 days my pc has just shut down whilst in-game ,eg bf4 and Assassins Creed Unity , once or twice a night , event viewer says -The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly. The PC has never shuts down when doing everyday tasks eg surfing the net watching movies ,downloading and so on. I've done a clean install of the O/S to rule out software related problems, also i've done a battery of stress tests ,eg prime95 whilst running FurMark for a hour or so and no shutdowns also run Valley and 3dmark firestrike for a couple of hours too still no shutdowns (all temps are good ) As i've been running said tests one has been monitoring system voltages i've noticed that the 12volt rail dose drop to 11.75 volts with the tests and the 3 volts are pretty much stable sometimes a very small drop eg 2.93-2.90 volts. When stressing with OCCT and FurMark the 12volt rail can drop to 11.56 volts When gaming with bf4 and ACU and monitoring the 12 rail is dropping 11.50 vlts is the lowest ive seen. However tonight i've played BF4 with a good overclock on my cards @ plus 62mv for a good 3hrs and no shutdown but still had volt drop on the 12 rail to 11.56. Could the shutdowns that i'm experiencing be my PSU beginning to fail or is there something else i'm overlooking (PSU about 4-5yrs old i think and has been well used . All temps are great , cpu overclock is over 1 and a half years old and never crashed in that time ever , its been well tested with overnight prime95 . Any help with this is very much appreciated as i don't want to buy a new PSU if i don't need one Is dropping 11.50volts on the 12 volt rail to big of a drop that maybe the cause of my problem? PS ,pc is the one in my profile. As always many thanks for any help
Yep, fo' sho'. Not quite outta spec but near enough. You might get away with running a single 780 for now, What's your budget?
ive been using hwmonitor for the software and on my motherboard, i also have voltage measurement points and have been using a multimeter today which has given pretty much the same measurements as hwmonitor sometimes shows a very silghtly more drop on the 12 volt 11.45-11.48 under heavy load , So today i've have backed off my CPU over clock to stock and also running GPUs at stock . I guess i will now go ahead and purchase a new PSU ,will probably go for a 1200w-1300w , but will wait for the sales to start which in the UK start the day after Christmas as i love a good deal , dont want to buy now then in a weak see the same product with 20-30 percent off as this drivers me insane . Was thinking of something like this http://www.overclockers.co.uk/showproduct.php?prodid=CA-007-SF&groupid=701&catid=123&subcat=2464 BIG Thanks to you chaps for your help and input , i pretty much thought it was the PSU but just needed a little help ,,, thanks again Case closed Merry Christmas to u all ...
Just a qiukie ,, do you think that this is a good deal as i think in ends tonight if sunday is the last day of the week http://www.overclockers.co.uk/showproduct.php?prodid=CA-007-SF&groupid=701&catid=123&subcat=2464 as i'm not sure that even in the sales if overclockers have one i would get it cheaper ,,, i like to buy all my PC parts from overclockers as they have good customer experience and no hassle RMA ,well this has been my experience with them ...
Just another quick update , i've just used the webby to calculate my power requirements . http://www.extreme.outervision.com/PSUEngine and including my water pump and fans, hard drives x6 wd blacks 2xSSDs and lights and overclocks, it comes in @ 1197 watts so im surprised that i've not had problems sooner than i have.
Those calculators tend to overestimate power requirements. You could get away with 850W, 1000W would be better and if you want another card then 1200W is ideal. Your OCZ has enough power but way too much 12v droop, so it's probably getting old. Don't know much about that Super Flower, see if there is a review on JonnyGuru. At $170 I wonder how it compares with the $150 Corsair AX860 or $100 Seasonic M12II 850 Evo....
I would go for that Superflower, it would be better than the Corsair. Not only that, Superflower make great PSU's and it should serve you well. If the PSU calculator suggests almost 1200 watts you would be an idiot to get an 850 W power supply. Yes, they overestimate in the calculators, but you don't want to run your PSU at or close to 100 percent.
850W is hardly idiotic. http://www.guru3d.com/articles_pages/asus_geforce_gtx_780_strix_6_gb_graphics_card_review,7.html Add another 234W for SLI and you get 600W draw with 20% headroom. That's nowhere near 100%....
That system load is only for the example, it isn't overclocked, with peripherals, any add on cards, 6 hard drives, 2 SSD's, water cooling, fans, and lights like he said he has. Considering the Corsair AX-860 is £149.99 the £169.99 for the Superflower isn't a bad idea. This is especially true considering it's the same price as the Corsair AX-860i. Also: System in IDLE = 119W System Wattage with GPU in FULL Stress = 343W Clearly states system in idle at 119 W, and GPU at full load. Adding two lots of the GPU loads together and the system at idle wattage is a very false indication, since when gaming the system will be possibly at full load too. Also consider the hard drives may not be in idle mode and everything else, it could easily go beyond 850 watts. You don't want to be paying for a new PSU only to find that there are occasions where it suits down due to over current protection like newer non crappy PSU's will do. If you still think the 1200 W is overkill, what about the 1000 W Superflower platinum for £149.99? Still, considering the price I'd prefer the extra headroom.
What are you talking about? It couldn't be more transparent: System Wattage with GPU in FULL Stress = 343W GPU power consumption = ~ 234 Watts Therefore total power draw at full load for SLI = 343W + 234W = 577W, call it 600W. This includes 4.6Ghz CPU OC and 780Ti. Where is the problem? Do you have any idea how much power a HDD uses during r/w operations? About 7W. But OK, add on 50W for 6 drives, and while we're at it throw in 20W for 10 case fans and another 20 for a water pump. So now we're up to 690W load on our AX860, leaving 170W spare, which translates to 20% headroom. You still think I'm an idiot? If I was forced to upgrade and price wasn't a factor I'd prob take 1000 over 850. However, if I added a second GPU but already had an 850W PSU then I would def keep it without hesitation. For that price in dollars I'd take the 1200W, assuming same quality.
Just going to add that PSU's are most efficient between 50% and 80% load. The "sweet spot" depends on the platform, but it will always fall between that range. My rule of thumb is to always shoot for double (or a bit less) of my system's theoretical max draw.
Can you rma your current psu? It might be faulty. If its under warranty give that a shot. a 1kw psu should be fine for all your stuff.
That's what I was alluding to, at least the 1000 W would be more suitable. It's also about price, the fact the 1000 W Platinum Superflower is the same price as the AX-860, and the 1200 W the same price as the AX-860i, I know which one I'd go for . This is of course, taking quality into consideration. Hey, if he decides to upgrade to a X99 platform and better graphics cards or whatever, least he wouldn't have to even think of whether the PSU is enough. If the PSU only ever had to supply a maximum of 750 W, at least it won't be stressing out, warming up, requiring the fan to run etc. The old PSU was powerful enough in theory, and of at least okay quality, but didn't have the headroom. Therefore, it had to work harder, it wears out quicker... You really want a PSU where you never have to consider replacing it unless there's a major hardware architectural change.