Which power supply?

[professorG]

Hi guys,

My winpower psu i ordered was DOA (not suprising apparently). I'm now looking for a replacement.

My main issue is i need to power a HD 4870 and a HD 4870x2 in tri crossfire.

http://www.guru3d.com/article/radeon-hd-4870-x2-review-crossfire/ - this reckons that 2 hd4870x2's
use about 740w max so i figured 750w would be fine.

These are my choices (max price £65 if you would like to suggest other options)

http://www.ebay.co.uk/itm/LIAN-LI-SILENT-POWER-SUPPLY-750W-ATX-PSU-MOLEX-SATA-PCI-E-PFC-120MM-FAN-/130737447341?pt=UK_Computing_PowerSupplies_EH&hash=item1e708f21ad

http://www.pcworld.co.uk/gbuk/ocz-zs750w-uk-zx-series-atx-psu-750w-11342078-pdt.html

http://www.ebuyer.com/219542-xenta-800w-psu-13-5cm-fan-kk9999-800p

I'd like to know about which ones are good/bad quality and if they will last a long time

Thanks!

 

[abekl]

If you are going to be doing tri crossfire, then you need more than 750 watts. 850 watts would be more appropriate.

The Lian LI PSU is a good one but underpowered.
The Xenta PSU is junk
The OCZ PSU is ok, but underpowered.

Keep looking for an 850 watt PSU, and stick to the major brands. I think you'll have to set your price ceiling a bit higher, but it's worth it not to have troubles down the road.

Here's one PSU:
Corsair 800W GS Series PSU
http://www.ebuyer.com/263997-corsair-800w-gs-series-psu-cmpsu-800guk

 

[DavidY]

XFX Core Edition 850 watt Pro Series (Seasonic) for about 80 pounds:

http://www.amazon.co.uk/dp/B0045L4BNW/?tag=pcp0f-21

Reviews here:

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=217

http://www.hardwaresecrets.com/article/XFX-PRO-850-W-Power-Supply-Review/1205

http://www.kitguru.net/components/power-supplies/zardon/xfx-pro-series-850w-power-supply-review/

 

[professorG]

Are you guys sure i'm going to need 800+ watts? On the guru3d review on hd 4870 xfire, the quad crossfire uses 740w on full load and has very similar specs to mine, so i thought that 750 would be enough for tri crossfire??

I really don't want to spend over £70 on a psu

 

[DavidY]

This user is suggesting that a 750 watt PS would be satisfactory for a tri crossfire:

http://forums.anandtech.com/showpost.php?p=29921095&postcount=10

XFX 750 watt Core Edition Pro Series for about 74 pounds:

http://www.amazon.co.uk/dp/B0045L4BJ6/?tag=pcp0f-21

 

[Silvune]

You can get the Corsair GS800 for cheaper:
£71 @ Scan
http://skinflint.co.uk/570151

I wouldn't bother with Pixmania unless you already have a power cord you can use as I'm fairly sure they'll send you one with an EU power cord.

Out of the three you listed I would suggest using the OCZ ZS series 750W.

 

[professorG]

Thanks, thats the one i'll get then