Originally Posted by Alastair
Originally Posted by Nisrock7863
I've hit a bit of a snag...I'm still at 4.4GHz, haven't changed a thing, but had a weird lock up while playing some Dishonored. Following said lockup, I rebooted and started tinkering with IBT AVX. I'd previously run it at 4.4GHz with the same voltage at the same settings (very high) for 20 passes with no problems. It failed within two passes and speed results that were lower than I'd previously seen. I upped voltages three or four times trying to find stability before I had a lightbulb moment and shut the computer all the way down, then fired it back up again. It passed twenty times with no issues, and with speeds that were more in line with where they should be.
I decided to do a little experiment. I'd read (I believe in this thread, actually) that running IBT AVX or Prime95 with Unigine Heaven at the same time will heavily stress the power supply and check its stability, so I did just that. Within five minutes the machine locked up again. Heaven has never given me any trouble before. I've run it for hours with the settings I'm currently running my GPUs at with no hickups. I've also run IBT AVX for extended periods of time with no problems.
What are the odds that my power supply is choking, or defective? It's a Corsair CX750, running an FX 8320 OC'ed to 4.4GHz at 1.356v on an Asus M5A99FX Pro R2.0 motherboard. My GPUs are two MSI GTX 660s with just a 200MHz bump to memory. My hard drives are an 256GB Samsung Pro SSD and a 7200RPM WD Blue 1TB HDD, and the only other draw (fans aside) is a DVD drive that never sees any use. According to the calculator I used I'm well within the voltage level provided by this power supply. It's only a few months old, but I'd previously noticed that it made an odd squeaking sound that got louder under heavy load. Maybe I need to RMA it.
Any suggestions would be greatly appreciated.
Yeah definitely sounds like your PSU. I would say try and return it and get a different model or a different brand. The thing is most of the Corsair PSU 's, (with the exception of the high end AX,and AXi models and I think the TX are OK as well) are of poor quality. So CX HX GS etc etc are made by OEM' s such as CWT which use poorer quality components like Chinese Capxxon caps. Which leads to lower quality. People just assume because it has the Corsair brandname on the box means it is better but that unfortunately is not the case. The thing is most of Corsair's range is overpriced for what you get when compared to the competition. Corsair is really testing their customers loyalty by using lesser OEM's and charging more than the competition. However using lesser OEM's it's not a bad thing. Endorsement of a lesser OEM by a brand such as Corsair will eventually lead to growth of the OEM and the quality will improve accordingly. Adding to more competition and better products for the consumer at the end of the day. But that day has not come yet. So get a different brand. CoolerMaster VS series are good and so are the V series. Other brands such as Antec and Seasonic are great.
HX is up there with AX and TX. See: HX1050.
CX*M and GS are "ok"
CX non-M are, shall we say, sketchy.
The corsair brand name DOES imply that it's better, because compared to other vendors, even their crap is golden. Need I remind you of my CM GS750 that can only provide 550-600w? Makes the CX series sound great. Of course, the brand much farther implies warranty quality than build quality at low end, and he really should have found a TX650v2 instead of a CX750 non-M.
The extra price is the cost of the warranty/support. The only company that was even on par with Corsair for RMA in my experience was Gigabyte. Even G.Skill isn't as fast.