Okay, I've been having problems with my PC when playing intensive games for months, (the sound stalls and the screen appears to power off as if someone's yanked out the cable/videocard) and I've come to the conclusion that the PSU might be causing the problem.
Temps are fine, and I've installed a third party CPU cooler that keeps it at a sensible temperature when under load.
Reinstalled windows entirely + New drivers multiple times.
Sent GPU back to manufacturer, and they claim no problem exists under testing.
Memtest comes up clean.
Cable to the monitor is fine, and I've no reason to suspect the monitor is faulty.
Specs:
Windows 7 Home Premium 64-bit SP1
Intel Core i5 3570K @ 3.40GHz
8.00GB Dual-Channel DDR3 @ 668MHz (9-9-9-24)
ASUSTeK COMPUTER INC. P8Z77-M (LGA1155)
DELL U2311H (1920x1080@60Hz)
932GB Seagate ST1000DM005 HD103SJ ATA Device (SATA)
My PSU is a Corsair CX, which I have been told is a somewhat dodgy choice as the capacitors aren't up to the same snuff as the usual corsair offerings.
The games tend to crash more often the more intensive it is, i.e. Watchdogs has lasted 10 minutes to 30 minutes, even just after a fresh reboot, whereas team fortress 2 can run for a whole day often with no problems.
Basically, I'd like to know how to test my PSU and determine if I have grounds to send the thing back, without just trusting that they'll bother testing it very thoroughly.
To properly test it, you need a load tester and an oscilloscope and the knowledge on how to use them. Since most people don't have either of these, there is no way to properly test a PSU.
The only thing you can do is attach a voltmeter to each rail when the computer is loaded down and see if the voltages go out of spec (+/-5% of rated value on each rail.) But this isn't a complete picture because voltages can be fine and the ripple current could be out of spec and you won't see it without an oscilloscope.
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