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750W PSU - good enough?

H

hyperfine

Junior Member
This is going to be my first build, I already ordered the parts, but now I am having second thoughts about the power supply.

I got the Corsair 750TX 750W PSU which I thought would be sufficient, but then I used Power Wattage calculator on ASUS website and it recommends 1000W?

Here is the system:
Coolermaster Cosmos S case with 4 case fans
Motherboard Asus Rampage Formula
Processor Q9450
2 video cards in CrossFireX configuration: HD3870x2 and HD3870
4GB of DDR2-800
Two Western Digital WD6400AAKS 640 GB in Raid 1
DVD drive

I am planning to overclock very modestly. Do you think the power supply would be sufficient or I should get more power?

Also, if in a year or so I will decide to upgrade to two 4870x2 in CrossFireX, would that change the equation?
 
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