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PSU Too much amps on 12v rail ? - need electronic expert

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Last response: in Components
May 25, 2012 5:27:07 PM

Ok I bought CHIEFTEC Nitro 88 series SPS-750C model PSU. link >

My PC which i also bought recently:

Gigabyte GTX 560 ti (factory OC)
WD Caviar Black 500GB 7k
Kingston V+200 SSD 60GB
2x2GB DDR3 1600Mhz dual channel Kingston (XMP)

Im not asking if "this PSU is too strong". I googled a bit and saw thats a stupid question. Because the PSU can only be too weak, not too strong right?

I was wondering about something else, like my thread title says. Look in this picture for my model SPS 750C >, It has 60A on 12v rail. I dont know what this means, I was just wondering if it can be "too much" and "backfire" on my motherboard or components, or stuff like that

Sorry if its a stupid question but i had to ask .I registered because i think this is a credible community. Many thanks and PS sorry for bad english

More about : psu amps 12v rail electronic expert

a b ) Power supply
May 25, 2012 5:32:52 PM

No I'm not an electronics expert, but the answer is no. You psu puts out 720w on the +12v rail.

The computer only draws what it needs. Your system probably draws around 300w under full load.
May 25, 2012 5:34:32 PM

Im not talking about the wattage. I mean what does 60a on 12v rail mean, can someone explain?

here > my model is SPS 750c

And sorry i realized i posted this as an "discussion" instead of "answer" (new member here :D )
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May 25, 2012 5:36:20 PM

Read this.

Amps (A) and Watts are a function of your load (all the combine parts). You can't oversize your PSU, just undersize and fry it. Oversizing just waists energy.
May 25, 2012 5:37:45 PM

60 A on the 12v rail is how much current it can deliver.
May 25, 2012 5:46:34 PM

price_th said:
60 A on the 12v rail is how much current it can deliver.

Ahhh I see now

Wattage is maximum capacity
60A on 12v rail = how strong current it can deliver on that voltage (12v)

Did i get this right?
a c 159 ) Power supply
May 25, 2012 5:51:43 PM

60A on the 12V rail means that the PSU can support power draws on the 12V rails of up to 60A; those are nice 12V specs. It means that the PSU has the capacity to provide that amount of power. The PSU will only provide the power that is required by the PC and no more; there is no chance of the extra capacity in the PSU damaging your PC components. My reservations about that PSU are from the ripple on the 12V rail; while it is decent at lower loads it gets up to almost 90 at high loads. High ripple causes premature wear on components; it is within spec, but higher than you should expect in a 80+ Silver PSU.

The two major draws on the 12v are the CPU and the GPU and you won't come near to 60A of power draw. Unless you SLI your 560ti and do some OCing you won't come close to putting a heavy load on this PSU so ripple should not be an issue with your current PC setup.
May 25, 2012 6:18:25 PM

Rugger thank you very much for your detailed response. Everything is much clearer now.

I was thinking if I should change this PSU (SPS-750C) for another one - Thermaltake XT TPX-675M .

Considering my pc components in the opening post, what do you reckon? Im thinking the nitro one is too strong for my pc
a c 159 ) Power supply
May 25, 2012 6:23:48 PM

Don't worry about it - keep your current PSU. No such thing as having a PSU that is too strong after you already own it.

If you didn't already have a PSU, then I would tell you to get a good quality 550W unless you were wanting to SLI your 560ti.
May 25, 2012 6:28:53 PM

Actually i dont already own it. I ordered it through however i can cancel the reservation. There is quite a limited offer at the moment here in southeastern europe thats the thing. What about Thermaltake XT TPX-675M then? I can find it here. Here is the link (scroll down) >

EDIT: Im worrying about not using the high potential of nitro. and maybe it would also result in more heat inside the case nitro being a very strong PSU. Would this change your advice?
May 25, 2012 6:55:33 PM


watts = voltage *current

its perfectly safe to have a higher amps output than you need.

afterall the number is the maximum rated output and your computer only draws what it needs
a c 159 ) Power supply
May 26, 2012 12:20:38 PM

It actually has one 6-pin and one 6+2-pin PCIe connectors. The 6+2-pin connector can act as either a 6-pin or an 8-pin PCIe power connector.
May 26, 2012 4:20:47 PM

Still good for what i need (gtx 560 ti) :) . The 575 only has one I think