Which power supply?

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!
6 answers Last reply
More about which power supply
  1. 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
  2. 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
  3. 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
  4. 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.
  5. Thanks, thats the one i'll get then :)
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