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GTX 260 on 550W

Last response: in Graphics & Displays
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April 17, 2009 9:02:13 PM

I have a 550W PSU from Chieftec. It has three 12V rails, 18A each (3×18=54A). Now I want to buy a Geforce GTX 260 that requires a 500W PSU and 36A power on 12V. I suppose my PSU will be fine, these 12V rails should self adjust ?? Funny thing is, the PSU only has one PCI-E cable with two 6-pin connectors.

http://www.chieftec.com/smart-power.html

More about : gtx 260 550w

a c 1410 U Graphics card
April 17, 2009 9:11:01 PM

Your psu does not have combined 54 amp 54x12 = 648 which is more than it can handle. You should try to get the rating of the manufacturers website if combined 36 you are fine.
April 17, 2009 9:28:09 PM

You are fine. Im pretty sure theres an adapter with the card. It can be found for cheaps, if not.
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April 17, 2009 11:27:36 PM

yep it's fine, unless your other parts are very high end like i7 etc
April 17, 2009 11:30:57 PM

Combined power on 12V is 360W. Geforce draws 180W so there should be enough left. My rig:

C2D E6750
4GB RAM
Geforce 9800GT
750GB Seagate.
a b U Graphics card
April 17, 2009 11:34:55 PM

You may be fine, but you can't add the rail amps. Also, if one rail is "dedicated" to the PCI-E power, than it can easily be overwhelmed. I know my old 2900XT (which drew a bit more power) did that to my 550W. Quality and age of the PSU is also an important factor.
April 18, 2009 10:12:53 AM

Just bought the card and it works. Thank you all. :D 
a b U Graphics card
April 18, 2009 4:48:01 PM

Your PSU is 30amps on the 12v rails.
April 18, 2009 4:59:20 PM

rolli59 said:
Your psu does not have combined 54 amp 54x12 = 648 which is more than it can handle. You should try to get the rating of the manufacturers website if combined 36 you are fine.


His power supply has exactly 54 Amps on the 3 +12v rails combined.....you add the max current of each rail 18+18+18...I don't know what kind of electronics theory you're using that you multiply his +12v current (54) by 12 (his voltage).....that would give you a theoretical max wattage output not current.
April 18, 2009 5:18:24 PM

How about Enrmax Liberty 500 watt and one GTX 260?
!