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PSU Amperage help

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Last response: in Components
January 14, 2011 8:11:58 PM

Hi I'm thinking of adding a Powercolor HD5750 to my OEM comp since I can get it for Can$80 but I'm getting more confused the more I read about psus and amp requirements.

My comp:
Compaq CQ5619F
Athlon II x2 2.7GHz 215 (Regor)
3GB DDR2 400MHz
sata HDD
Win 7 64-bit
250W PSU (which'll have to be replaced ofc)

I'm planning to run games like ME/ME2, SC2, HL2, Portal2, CoD, AC2 etc. My monitor is 1600x900

I need to know if I need a high amp psu for this?

I want an affordable psu (<$50 would be great) and 400-500Watt seems more than enough but some only have one 12v rail at 18-28A. The guide in these forums says to divide recommended wattage by 12 so for HD5750 the AMD site lists a 450W+ psu: 450/12 = 37.5A PSUs that list 40A on 12v rail are all 800W+ models

This PSU has 348W combined on two 12v rails so that's still only 28A
And I'm not planning to oc or anything, I might add a better cpu in the future.

More about : psu amperage

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a b ) Power supply
January 14, 2011 10:42:40 PM

anubis333 said:
Thanks for the quick reply.
So I guess I don't have to really worry about amp ratings, one of those psus has 28A but the other only has 18A

I also just found this great psu calc that shows watts and amps and it says "typical gaming 12V1 draw" would only be 7.3A

I think I'll go with this ocz 500w, only $34 with rebate

The OCZ has 36a and the Corsair 34a.

The Stealth X isn't as good as the Modx or Fatal1ty OCZ psu's and only has 1xpci-e cable.

If its $35 you need to spend then get the Corsair CX rolli recd.
a b ) Power supply
January 14, 2011 10:49:50 PM

What you pay in dollars I pay in pounds so think yourself lucky. :pfff: 
January 15, 2011 1:55:40 AM

Thanks I went with the modextreme 500w since it has PCI 6 and 6+2 connectors, and it's modular
a c 878 ) Power supply
January 15, 2011 2:23:34 AM

Good one!
January 24, 2011 11:43:17 PM

Best answer selected by anubis333.