PSU & Crossfire power consumption

[DannyH]

Hi guys,

I currently have the OCZ ModXStream Pro 700W PSU and I'm just wondering if it will run two HD7970's? I'm currently running just the one card at the moment but I'm wanting to upgrade to a 120hz monitor and crossfire.

I've read up on reviews that the crossfire of these cards takes up about 407w but at absolute full load these cards can pull out 567w combined with my 115w on my CPU this is cutting too close for comfort.

Extra question in what's the best connectors to use to run another card as my PSU only has 1 x 6 pin and 1 x 8 pin?

Will list my hardware down just for extra information on what my computer is currently running:

i5 2500k @ 4.5ghz (115 watts at full load via core temp)
XFX R7970 @ 1050/1500
8gb ddr3 ram
1 SSD & 1 HDD
RS120 Watercooling
Asus Xonar STX
4 x 120mm fans

Thanks for any answers on this, I understand it's a long question but I'm so confused and want to upgrade asap!

 

[ko888]

Measured power consumption of only the graphics cards for ASUS Radeon HD 7970 2-way CrossFireX, via PCI-Express power connector(s) and PCI-Express bus slot:

http://www.techpowerup.com/reviews/ASUS/HD_7970_CrossFire/22.html

The fact that your PSU only has one 6-pin and one 8-pin PCI-E Supplementary Power Connectors would indicate that it is insufficient. You need at least two 6-pin and two 8-pin PCI-E Supplementary Power Connectors from the PSU.