Power draw on the 12v rail of some components

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Haysbury

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Aug 6, 2014
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Hello,
If somebody knows, I would like to know how many amps would a gtx 750 and AMD Athlon X2 5200+ (65w TDP) cpu draw from the 12v rail of the power supply? Any ideas? :??:
I have a relative that will buy this gpu (gtx 750) on 2nd hand at a good price, but has a psu which offers tops 15 amps on the 12v rail. I strongly advice him in buying a new one, but could it actually work as is? Just asking. :D
Thank you!
 
Solution
hunter315
The 65W CPU is going to need ~5.5A for itself. The GTX 750 has a TDP of 55W so it will need ~ 4.5A, which puts you at 10A just for the CPU and GPU. Each drive needs ~1A, fans need ~0.3A, and a motherboard usually needs about 30W so ~2.5A, so two drive, two fans, a 30W motherboard, 5200+ and 750 put you at 15.1A.

This is all assuming that the PSU is rated at real temperature, hasn't lost much capacity due to aging, and could actual do its label rating for an extended period of time. PSUs generally lose capacity at 1-3W/C above their rating, so running a 400W PSU that was rated at 25C in a 45C case means you only have about 340W left.

Be careful with low wattage PSUs, they are low wattage for a reason.
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hunter315

hunter315

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May 12, 2009
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The 65W CPU is going to need ~5.5A for itself. The GTX 750 has a TDP of 55W so it will need ~ 4.5A, which puts you at 10A just for the CPU and GPU. Each drive needs ~1A, fans need ~0.3A, and a motherboard usually needs about 30W so ~2.5A, so two drive, two fans, a 30W motherboard, 5200+ and 750 put you at 15.1A.

This is all assuming that the PSU is rated at real temperature, hasn't lost much capacity due to aging, and could actual do its label rating for an extended period of time. PSUs generally lose capacity at 1-3W/C above their rating, so running a 400W PSU that was rated at 25C in a 45C case means you only have about 340W left.

Be careful with low wattage PSUs, they are low wattage for a reason.
 
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