12gb ddr3 / i7 920 / 4850 x2 system

[rockyrococo]

Basically I am unsure how much power I will need for my system. I plan to run with one 4850 X2 video card, 6 sticks of 2GB DDR3, an i7 920, 2 SATA hard drives, 1 DVD RW drive, and maybe a Blu-Ray reader and SS drive. I want to make sure I have plenty of headroom for overclocking. I did a power estimate at http://extreme.outervision.com/PSUEngine and got a recommendation of 672W. These are two power supplies I am looking at:

OCZ StealthXStream OCZ700SXS 700W - $80 minus without $20 rebate
http://www.newegg.com/Product/...x?Item=N82E16817341019

Output:
+3.3V@36A,
+5V@30A,
+12V1@18A,+12V2@18A,+12V3@18A, +12V4@18A,
-12V@0.8A,
+5VSB@3.0A

I am unsure if I should add up these four rails to 72A for +12V to compare to the Corsair PSU:

CORSAIR CMPSU-850TX 850W - $140 without $20 rebate
http://www.newegg.com/Product/...x?Item=N82E16817139009

Output:
+3.3V@30A,
+5V30A,
+12V@70A,
-12V@0.8A,
+5VSB@3A

If someone has a good recommendation for another PSU I would very much appreciate it!

Thank you for your help.

 

[theAnimal]

The Corsair is definitely better quality and has considerably more 12V amps (the OCZ is actually 50A max).

My suggestion would be to replace the 4850x2 with a 4890, roughly the same performance and no CF issues. In this case I would recommend a Corsair HX520.

Also 6 sticks of RAM will limit your OCing a little more than 3; unless you really need 12GB, go with 6GB.

 

[rockyrococo]

thanks for your suggestions ^-^ i appreciate the feedback very much

 

[A5]

Also, you can almost certainly get by with the 650W or 750W Corsairs for a bit less money.

 

[joutlaw]

Originally posted by: theAnimal
The Corsair is definitely better quality and has considerably more 12V amps (the OCZ is actually 50A max).

My suggestion would be to replace the 4850x2 with a 4890, roughly the same performance and no CF issues. In this case I would recommend a Corsair HX520.

Also 6 sticks of RAM will limit your OCing a little more than 3; unless you really need 12GB, go with 6GB.

I have the HX520 that has been powering my rig for almost 2 1/2 years

GA-965p-DS3
e4300 @ 3.0
4x1GB of gskill DDR2 RAM
2x74GB Raptors

Recently added a MSI 4890 and it's running solid.

The HX520 is a modular PSU which is pretty nice.

 

[RavenGuard]

To give you an idea of the kind of power you need:

I run Phenom II 940 @ 3.7ghz
4GB of Mushkin XP2-8500
790FX Chipset
HD4890
HD4870
Asus Xonar DX
3 hard drives and 2 optical drives

I do this with a PC P&C 610 watt and it works flawlessly.