Best PSU for high-end Haswell System

Now I'm home I'm running PC as normal and testing stability. Sadly I've had some unusual stuttering occur.

These manifest as mouse stutters as it jerks across the screen, audio lag (where the audio slows right down) and sometimes the PC locks up and needs resetting. Seemingly random and inexplicable.

At first I thought it was my Creative ZxR Audio card, but the same happens with onboard audio, and even with audio disabled in bios, and all drivers removed.

In an attempt to resolve this, I have tried many solutions:

- Original BIOS it happened (which is also the most recent)
- Disabled Intel SpeedStep, energy saving in BIOS.
- No overclocks or XMP
- No other tasks are being done - simply just browsing the internet, or simply on the desktop.
- Updated all drivers (GFX, Audio, Chipsets, Mouse, all onboard controllers)
- I've installed a new SSD and reinstalled Windows 7 and fully patched (and repeated all above steps).
- I've reseated CPU (and checked pins) too.
- CPU temps are 25-50'C depending on if stressed.
- Motherboard temps are 25-30'C
- I've removed my HD 6990, and it still occurs with a 770 card.


I'm of the assumption that the CPU and/or Motherboard is faulty as I can think of no other reasons for the system to slow down intermittently.

Might anyone have any ideas that I can test before I look to replacements?
 
All I can suggest is make sure the SSD is on a Intel SATA port (if there are third party ones on that board?).

Build it up with the absolute bare minimum needed to run and test.
 
PSU seems quiet enough, and no capacitor whine that i've noted thus far!
RAM has XMP'd fine too :)

Sadly, just when I was testing the system in Youtube with some Gangham Style, the audio sllooowwww thing occurred and the system stuttered again. This time with HD onboard Audio (i've sent my ZxR back).

So i've changed:

PSU
RAM
SSD
Audio


All that is left is Motherboard, CPU, Case, and, at a push... the GFX.

(GFX handled Furmark for 15mins fine, didn't go above 69'C, CPU did 25mins of Prime95 and reached 59'C, despite being cooled by H100i - but extra heat could come from Prime95 as well as the XMP'd 2400MHz TeamGroup RAM).


Any thoughts on next course of action? - I'm tempted to look to CPU and Motherboard next. Obviously I am mindful of DSR here...
 
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I just bought the Corsair AX860 and it just works so i would highly recommend that. Its also able to deal with an OCed Fx8350 and 2 OCed 7950 without making a sound. This is all in the Corsair Carbide 540 Air case. I would also recommend you change your H100i Fans if they are stock to something like noctua Noctua NF-F12 PWM 120mm for much reduced noise without loosing cooling performance.
 
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