PSU Advice? Running short on power

komodo13 · Oct 3, 2013

Hi,

I recently upgraded my graphics card to an HIS 7950 IceQ Boost Clock. Since then my PSU has been struggling a little, it works and doesn't crash at full load but now beats the GPU and CPU as the main heat creator in my system, and (according to GPU-Z, I know software doesn't always read it right but here goes) the 12 volt rail reads 12 volts at idle but drops to 11.41 volts when loaded, which is only just in spec. My PSU is a cheap thing, £30 for 550 watts, and considering I'll be wanting to overclock the GPU in the future (this version is voltage unlocked) and add more RAM, I'm trying to find a good PSU for a good price. I've heard seasonic are great but they're pricey, so I was hoping for a rebranded one that was cheaper.

System is AMD Phenom quad core 9950 Black edition,

4GB DDR 2 RAM,

4 SATA HDDS (2 desktop 2 laptop)

Radeon HD 7950

+2 PCI cards

I know its an ancient system with a beefy GPU but I can't afford to be upgrading right now.

Thanks in advance for any help, hopefully I haven't made the post too long!

Edit: am hoping to try to stretch to a 700 watt supply, but if this is way over the top for this system let me know

rolli59 · Oct 3, 2013

German prices OCZ 550 watt have one of these running 3570K and HD7950 http://de.pcpartpicker.com/part/ocz-power-supply-oczzs550w and XFX 550 (made by Seasonic) http://de.pcpartpicker.com/part/xfx-power-supply-p1550sxxb9
I believe it is the right decision to replace your current one.

kulmnar · Oct 3, 2013

Best PSU for your build that I could recommend: Seasonic S12II 620W: http://uk.pcpartpicker.com/part/seasonic-power-supply-s12ii620bronze
Here's another PSU (Corsair CX600, 600W)...this is a budget gaming PSU, go for this if you can't afford the Seasonic: http://uk.pcpartpicker.com/part/corsair-power-supply-cx600m

komodo13 · Oct 3, 2013

Sorry, should have said I'm after a higher wattage, 700 watts I'd prefer to have to cope with any new hardware I eventually get.

kulmnar · Oct 3, 2013

komodo13 :

Ok then, I'm assuming you want something available in the UK...

This is the best at 750W, Corsair TX750 V2: http://uk.pcpartpicker.com/part/corsair-power-supply-cmpsu750txv2

The cheaper version, Corsair CX750, 750W PSU: http://uk.pcpartpicker.com/part/corsair-power-supply-cx750

rolli59 · Oct 3, 2013

550 quality watts runs almost every single GPU on the market if you want higher go 750 so you can use dual GPU's. XFX 750 watts http://de.pcpartpicker.com/part/xfx-power-supply-p1750xxxb9

komodo13 · Oct 3, 2013

They both look good, is there any real difference between the 2? why is one more expensive?

rolli59 · Oct 4, 2013

The XFX in the UK http://uk.pcpartpicker.com/part/xfx-power-supply-p1750snlb9
Corsair TX is better than CX and comes with a longer warranty.

kulmnar · Oct 4, 2013

komodo13 :

If you're referring to the price difference between the CX750 and the TX750V2, the TX750V2 is guaranteed to deliver 750W of power at a temperature of up to 50 degrees celcius...the CX750 will actually deliver less power as it's temperature increases...it will probably start delivering less power at 30 degrees celcius and above.

komodo13 · Oct 4, 2013

the TX750V2 looks to be worth the extra then. rolli59 does the XFX have any disadvantages or is it effectively the same reliability at a cheaper price?

rolli59 · Oct 4, 2013

It is a very popular brand with great reviews it is made by Seasonic and is easily in class with the Corsair TX. Available as well as semi modular http://uk.pcpartpicker.com/part/xfx-power-supply-p1750xxxb9

kulmnar · Oct 4, 2013

komodo13 :

The XFX has no temperature guarantees...the TX750V2 is guaranteed to 50 celcius by Corsair: http://www.corsair.com/enthusiast-series-tx750-v2-80-plus-bronze-certified-750-watt-high-performance-power-supply.html

komodo13 · Oct 4, 2013

Just taken apart my desktop (had a stuck exhaust fan) and have found 2 things. 1. this thing is a 650 watt. 2. it has 2 rails each rated at 18 amps, meaning my entire output is only 432 watts on the 12 volt rail. im guessing this means i could get away with a much leaner power supply and still have plenty of power to spare?

rolli59 · Oct 4, 2013

kulmnar :

What do you mean it delivers 931.2 watts before it shuts down and temp is over 50°C http://www.hardwaresecrets.com/article/XFX-PRO-750-W-Power-Supply-Review/1182/8
It is rated at 50°C just like the TX Corsair and comes with 5 year warranty just like the TX Corsair.

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