Hi guys, I've been reading around alot at different PSU's, rail voltages and of course the wonderful phenom bug and I would appreciate some expert advice on how stable my system is: so here are the specs.

MB: Asus M3A32-Deluxe non wifi (New as of last month)
RAM: 2GB Corsair PC-8500 (New as of last month)
Processor: Amd Phenom 9500+ ~2.2ghz (New as of this post)

Gcard: XFX 8800GTX 756mb (New as of last weekish)
PSU: 550W Antec Truepower 2.0 (Approx 1 year old - good use)
Soundcard: Soundblaster Extreme Music (Approx 1 year old)

Hard disks:
2x storage 750gb + 500gb WD caviars (SATA 2-4)
1x OS + Software 150gb WD raptor (Sata 1)
2x Gaming 75gb WD raptors in RAID 0 (raid 0-1)

1 Dvd Drive (not rw)
1 fan controller with LCD display
1 blue LED HD rack

3 fans, 1 exhaust 12cm, 2 front intake on HD racks 12cm

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Basically most of the items are new except the PSU and souncard. The system performs well on everything however last 2 days I've had system instant power-offs playing COD4 (after maybe 1hour or so) and after a bit of research was wondering if my system has enough juice? After playing around with a MB monitor my 12v rail fluctuates a bit between 11.09 (low) and 12.10 (high), +5v seems constant @ 4.86v as well as 3.3 rail (3.22v).

I have latest nvidia drivers, cpu drivers, soundcard drivers and run dual screens. Oh and I also use a APC backup power unit 230v @ 1000VA sounds about right.

Any ideas?

That fluctuation is high. The psu is being stressed too close to its limit. You should consider get a new one. Also, what's the rating on that 12v rail or rails?

36A max on 12v1 and 12v2

If that's 36amps per rail, then it's good and shouldn't produce those fluctuations. If it's 36amps total, it's not good. Either way, with fluctuations like that, it's a good idea to get a new powersupply.

First test might have been an anom, second test is better, 11.97 - 12.10 staying mainly around 12.03 with occasional spikes to 12.10 and maybe 1 to 11.09 when alt-tabbing back in?

Its 36A for both together

That's not bad, but 36amps for both is pushing it. If you have the cash, upgrade the psu.

http://www.scan.co.uk/Products/Pro [...] tID=602505

thats within my price range, found it from the tiered list, I will be upgrading in around 6months to either a new gcard/proc or SLI gcards - so would it be worth getting a better on than that?

That should do it. In fact, 54 amps on a single rail is outstanding. Most psus spread the ampage over multiple rails, which means a small loss in total power due to switching. This is what I use right now, for comparasion purposes: 850watt, 4 rails at 20 amps each. It was only $110 when I brought it, now they jacked up the price.
http://www.newegg.com/Product/Prod [...] 6817101029