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Will 400W do the job? - Page 3

post #21 of 29
Thread Starter 
Quote:
Originally Posted by redsunx View Post
It'll do fine. What are you planning on doing with it? While the 18 Amps is....CHANCEY it'll probably still work.
planning on doing some LIGHT overclocking. And most likely do a bios mod on the 7900GTX , but other than that nothing since i will be selling it on ebay to make a profit.
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alpha
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post #22 of 29
Quote:
Originally Posted by redsunx View Post
Ummm no...there's a user on here that has a 400w 17amp PSU and he's using an 8800GT on it.
Well good for them. Nvidia probably overstates the amperage for safety but they don't just pull these numbers out of thin air either. I would say he's going to be pushing it with only 18amps, especially if he plans on overclocking.
i7 monsta
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post #23 of 29
You can give it a try first. It may work but that's only 12-13A on that single 12v rail, which is little for a 400W psu to me. I have an old Enermax 340w and single 12v rail but it has full 18A. It is still working fine with e2160 at 3.5G and 8600GTS.
post #24 of 29
Ok ignore everyone else in this thread. 18A will be fine.

See my rig, antec quattro 850W, my 12V rails are rated at 18A. So you guys are telling me that my 8800gt wont run fine. LOL. My PSU will happily run crossfire 2900xt's which drain some serious juice.

The biggest mistake people have when building a computer is they go over the top when getting the psu. The specs most companies list for their products, in terms of power supply, are normally way over the top. As long as you have a decent make of psu, will good outputs then you'll be fine. Make sure you get one with pci-e power connectors. Rigging them up to molex connects with a converter is never a good idea.
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post #25 of 29
Thread Starter 
Quote:
Originally Posted by Sikozu View Post
Make sure you get one with pci-e power connectors. Rigging them up to molex connects with a converter is never a good idea.
oh.. thats what i would be doing...
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alpha
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post #26 of 29
Sikozu, you have 4 18amp rails. Your card maybe pulls less than 10 amps by itself.
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post #27 of 29
Quote:
oh.. thats what i would be doing...
Noname - I think you'll be fine. Trying costs nothing anyway (even if it does brick the PSU, its a good quality one and your components will be safe)
I say try it, but watch the voltages carefully, and make sure its well stress tested.
post #28 of 29
I think it will be fine. Give it a try.

A 12v rail is rated at 18A doesn't mean it is able to produce adequte 18A. It is just a max current limit for each 12v rail. In multi-rails (can be a real multi rails or not) PSU, we can't just add them up. We need to figure out what the actually wattage goes to those 12v rails. For example, like Antec NeoPower 650W, it has three 12v rails with rated 19A each. The total amperage is 54A instead of 19x3.
post #29 of 29
Thread Starter 
okay sweet. +rep to all who helped

you guys are so smart
alpha
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alpha
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