Thermaltake Litepower 700w Crossfire 5770s?

[Nerdbox87]

Hi,

A friend of mine bought the following PSU for his system and is thinking of adding a second 5770 for crossfire - i'm however very concerned about whether it will be able to cope and run safely.

http://www.thermaltake.com.au/Products/PowerSupply/W0356/Litepower700W.aspx

His specs are;

890GPA-UD3H
x6 1090T w/ Thermaltake Frio
8gb Elixir 1333 (2x4gb)
Powercolor 5770
Thermaltake v5 LAN w/ additional 120mm fans
Single HDD / DVDRW


From what I can see his PSU is actually max continuous output 600w and does not appear to be 80+ certified and has two 12v rails (30A and 22a). (which makes me nervous in many ways, <3 my HX-850)

It does however have the required PCI-E pins and claims to have Over-Current/Over-Voltage protection.


The plan is to take his 1090T to a decent overclock (obviously with as near to stock voltage as possible to keep power consumption down) and add a cheap secondhand 5770 for crossfire (these won't be overclocked).


Would love to hear whether anyone thinks this PSU would be OK for this??


(PS - i'm aware a 6850/GTX460 would be the safer alternative for slightly reduced performance, but that'd cost $120 (incl. sale of his current 5770) vs 80$ to add a second 5770) *Australian Prices*

 

[rolli59]

600watts is plenty for 2 x HD5770 in CF. Total system power under load is 390 watts http://www.anandtech.com/show/2856/13 so plenty of overclock headroom as well.

 

[beanoslim]

On paper it should work, a 600w+ is recommended as long as it is a quality unit.

If you switched to GTX460's you would then need 4xpci-e cables, 2 for each card.

Unless the psu is poor quality it should work ok.

 

[Nerdbox87]

Thanks for the quick replies - I'd be very comfortable running his system with a good 600w (corsair/seasonic etc), however this specific budget unit?

Also - the Phenom II X6 chips chugg down a fair bit of power especially when overclocked.

You're still fairly confident?

(PS the switch would be just to a single GTX460/6850, which isn't that attractive as more expensive and less performance, just less power req.)

 

[rolli59]

It would never have been my choice of PSU but it is rated at 600watt constant load and the +12 volt rails are good so I am confident it will run it.

 

[Nerdbox87]

Agree - if I was involved in picking the parts he would have a TX-650 or similar but it seems this may just scrape through for his needs.

Thank you both for your help.

 

[Nerdbox87]

Best answer selected by Nerdbox87.

 

[Nerdbox87]

As would I but bought/built without my input months ago

 

[Mousemonkey]

This topic has been closed by Mousemonkey