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Need Help picking up a psu !!

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Jul 14, 2002
Hi building new system and i want to know what size psu i need. Sys spec is

-Thermaltake Armor +
-Asus Rampage Formula
-Intel Quad 9450
-2x2gb ocz plat ddr2 800.
-Sata dvd drive
-2x Seagate 250gb sata2 hdd
-Diamond 3870

I will probly go crossfire with dual 3870 and fill the 2 ram slot and do some OC, i want modular psu with at least 120mm fan. Psu i was considering,

-enermax DXX 850w
-Corsair HX1000

i love the enermax DXX will it be enought for my system ?? any other suggestion would be appreciate thx.
Technically, even a Zeus ST56ZF will run that without problems, but I'd suggest you go with an Indy regulated unit like the Corsair TX750 or BFG-800ES (if you are more comfortable using a larger wattage unit) as mentioned by Scott and Cabose. What is your budget, BTW?