Computer Randomly Turns Off

For the past couple of week my computer has been turning itself off without warning and without the BSOD. Initially I thought it was overheating since I am overclocking my q6600 pretty hard in the summer on air cooling. However, after turning my OC down to 3.0 and looking at my CPU temps while running prime 95, the tempe were fine and the PC never powered off. Just as a test, I put the OC back to 3.4 and ran prime 95. The temps were averaged around 68-70c but surprisingly the PC did not turn off. This was the point where I realized it wasn't the heat or the over clocking that was turning it off.

It seems to only happen when I play games. At this point I am thinking that my five year old power supply is starting to go on me. Maybe the Graphics card + the CPU is taking too much power for it these days. Bear in mind that I have been using the same GPU,CPU and power supply together for the better part of a year.

I am going to do a couple of more tests to make sure everything is working in my device manager and also make sure I am clean of malware and virus'. I also got an SSD a couple months ago but I don't think it's the cause.

If it does turn out to be my power supply; What is a good modular power supply to get these days? Is there one, or should I stick with the regular power supplies? I think 750w will be good enough since I will only ever use a single GPU. However, I am building a new PC when the next Intel (tock) chips come out and I will overclock both the CPU and GPU.

So you're waiting on Haswell? Next year for a CPU then? Okay, well, regardless of which cpu you get it'll probably use less power than a Q6600, overclocked or not. I'm simply basing this on estimates of Haswell and the fact that Ivy Bridge tops out at ~80w before overclocking. All this you probably know.

And since Nvidia came down to Earth with their power requirements, we can reasonably assume a good 750w PSU will be enough for any single-card solution.

That said, I haven't been keeping up on the day-today news of PSUs so take this with a small grain of salt. Corsair is still making some good PSUs, but I'd go with a Seasonic. They consistently make some of the highest quality PSUs with amazing performance. Your OCZ, as far as I can tell, wasn't actually 80+ certified, though the OCZ site says it runs at 83% efficiency, which means you're probably not quite getting that good of performance (probably in the 70% range). With a 750w PSU and, say, Gold efficiency you'll be pulling out more power for less money. Yay!

I'm rambling. Check out what Seasonic has to offer and if their prices are something you're willing to pay. I mean, they come with a 5 yr warranty for a reason. Corsair has that on their higher end units also, though I'd shell out the extra $20 or $40 for a Seasonic, especially since you're not in the midst of a full build right now.

Also, browse JohnnyGuru and HardOCP and see what they've reviewed, especially considering that efficiency isn't the end all be all in power supplies. You're looking for quality builds and voltage regulation, which is something only in-depth reviews can tell you.

I had Seasonic on my mind but I'v always backed off in the past decade because of the the premium price. I may go with it this time. With the advent of more power efficient GPU and CPU what are the chances a 650w PSU can do the job? Or should I just stay focused on the 750w since I will overclock?

After reading a bit more I think I am currently suffering from an "overload shutdown". I wonder if PSU efficiency degrades over time because I was fine with this configuration for quite awhile.

garion333 wrote:

Also, browse JohnnyGuru

This is the best advice out there when it comes to picking a power supply. HardOCP's reviews are good too, but generally I just read jonnyguru and go from there. I picked up my 750w XFX supply shortly after he raved about how great it was.

PSU efficiency definitely degrades over time, which is why paying the premium for a better PSU is a good option in the long run. How much it degrades, well, I'm not sure. Depends on the parts used and how well it was constructed. When Malor's PSU died he bet that it was because he didn't have enough headroom over what his system was pulling, which is exactly where you could be.

I would say that a 650w would likely do the job, yes. I'd probably go with the 750w (which is what I have) just to make sure since we don't actually know what the specs on the future CPUs and GPUs are going to be. I'd rather spend more money now to avoid a headache later.

If you want to save some money and go with someone other than Seasonic, then use the reviews to figure it out. JohnnyGuru has given plenty of Corsair, OCZ, etc. PSUs high ratings, but they are usually dependent on model of the PSU since many get OEMs from different companies and then modify them. For instance, Corsair will use Seasonic as the basis for some of their PSUs.

Glad I waited a bit. The Seasonic X750 gold is $40 off at Newegg. $119 for a nice Seasonic PSU is a great deal.

Ok I got the awesome sounding Seasonic x750. It got great reviews everywhere even on Johnny Guru.

I pretty much confirmed that it's my PSU by running furmark and Prime95 simultaneously. Temps were fine and it shut down within 3 minutes.

Nice grab. That's a great price ... ya bastard.

Seasonic power supplier are top shelf. I've got the same X-Series model and it's fantastic. I'm a bit of a PC quiet fetishist and I really love how when it's not under load, it's efficient enough that it can actually shut the fan off entirely. That's the one place I always tell people to put top dollar into. A good power supply is one of the best reliability investments you can make and a really good one will last you through years of upgrades. FYI for the future, Corsair power supplies are rebranded Seasonics so if you see them cheaper, you're getting a very similar product.

Adaptive double

Parallax Abstraction wrote:

FYI for the future, Corsair power supplies are rebranded Seasonics so if you see them cheaper, you're getting a very similar product.

I'm pretty sure Corsair sources supplies from more than one company, or at least were still doing so as recently as late last year.

In fact I'm pretty sure the majority of both the TX and HX lines are built by Channel Well Tech with the exceptions being the 650 watt models that are from Seasonic.

I'm on my phone so I'm having trouble digging up facts quickly, but the more I think about this the more sure I am. Most of Corsair's PSU's are Channel Well units.

According to HardOCP, XFX are Seasonic.

Seasonic packages their PSUs like they are Maserati's. Certainly get what you pay for though. Never thought I'd see a PSU in a felt case. 

It came with plenty of wires in their own case of course which is awesome and I love that it's modular. Of course, if your case does not have good pathways for wire management like mine, it doesn't really matter.

I ran prime 95 and furmark and the PSU fan did not even need to turn on. Pretty impressive. Oh, and my computer never turned off even after going back to my higher voltage overclock.

So just confirming to any future readers that my power supply was definitely the problem.

TempestBlayze wrote:

Seasonic packages their PSUs like they are Maserati's. Certainly get what you pay for though. Never thought I'd see a PSU in a felt case. 

It came with plenty of wires in their own case of course which is awesome and I love that it's modular. Of course, if your case does not have good pathways for wire management like mine, it doesn't really matter.

I ran prime 95 and furmark and the PSU fan did not even need to turn on. Pretty impressive. Oh, and my computer never turned off even after going back to my higher voltage overclock.

So just confirming to any future readers that my power supply was definitely the problem.

Awesome!