New PSU advice required

Hi all,

I currently have a CiT 550w PSU, I have just upgraded my machine apart from the PSU. I have had Windows7 just lock up and/or restart and was wondering if the PSU was insufficient... i know the brand isnt considered much among people so I need an upgrade!

I understand I need good current/amps on the 12v rail. How many Watts are enough? OCZ ModXstream 700w. - Dual 12v Rails @18amp/rail

I may not need all that power but for the price its worth it for future upgrades (maybe xfire)

PS everwhere in UK seems to be sold out of the OCZ!

What I have:
Phenom 955
2x Sata Hdd's
Radeon 4890
MDI 790fx GD70
3x12cm fans
DVD Drive

Thanks for your help in advance!!
3 answers Last reply
More about advice required
  1. Unfortunately I am not familiar with the CIT 550 watt power supply.

    We just had another thread asking about the OCZ ModXstream 700 watt power supply. I managed to find two technical reviews (It's usually the larger 750 watt model that gets reviewed). The psu is more than adequate for a system with an ATI Radeon HD 4890 video card.
  2. Thank you Johnny,
    I was wondering if 18a/channel is suitable for a stable system even if i wish to add say another hard drive and gfx card.

    I guess i am seeing other models with a single 12v rail that can handle 50a and thinking "is this something that would benefit me"
  3. I'm in the U.S, but I run a CORSAIR|CMPSU-750TX 750W. With almost an identical setup. I'm not sure what your options are, being in the U.K and different PSU brands/voltage.
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