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4 Pin ATX to supply an unlocked 550BE?

CMetaphor

Quadfather
Joined
May 5, 2007
Messages
5,080
Location
Montreal, Canada
Hmmm... Math time:
OCZ Specifications list 2x 12v Rails @ 18A maximum each.

Ohm's law: Voltage * Current = Power (in Watts)
therefore: 12v * 18A = 216watts Max
approx. OC'd processor wattage (AMD) = 140w TDP or more. Which only leaves 66 watts for your motherboard, ram, hard drives (probably sharing the same rail as well).

What graphics card are you running with that setup? You might even hit the max combinated 12v load on the two rails if you're not careful...
 

Caldezar

Well-known member
Joined
Aug 21, 2008
Messages
2,248
Location
Edmonton Area
Check the primary in my sig, that's what I'm running with the 500W. I may just go buy the XFX 850W PSU in the near future. Just seems I'm spending way too much money recently. But at least then I'll be good to go for crossfire with another 4890...
 

Zero82z

Banned
Joined
Sep 2, 2009
Messages
5,409
Location
Montreal, QC
CPU and motherboard power duties are shared between both rails. PCI-E connector is on one and everything else is on the other. You'll have no problems with that PSU; no need to upgrade anything.
 

0o0

Banned
Joined
Oct 12, 2009
Messages
851
Location
Toronto ON
What I'd do is post that psu up for sale, and use it until someone buys it so you can cover some of your upgrading expense. Theoretically it'd be just fine with the 4pin, but I think there must be a reason why mobo's have 8pin atx plugs lol
 

Zero82z

Banned
Joined
Sep 2, 2009
Messages
5,409
Location
Montreal, QC
I think there must be a reason why mobo's have 8pin atx plugs lol
Not really. The EPS12V connector was designed for server applications. Desktop CPUs don't require it when running at stock speeds. The only time it becomes a concern is with a heavily-overclocked CPU.
 

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