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My new GPU requires 42A on the 12v rail, am I okay?

post #1 of 15
Thread Starter 
This is the PSU I'm using.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151027

+3.3V@24A, +5V@30A, +12V1@18A, +12V2@18A, +12V3@18A, +12V4@18A, -12V@0.5A, +5VSB@3.0A

Does the 12v rail being split matter?

Combined it's 72A, but on the sticker it says 41A max. Will being 1A short actually make a difference? I always take PSU recommendations from GPU manufacturers with a grain of salt since they've always been so inflated (the card in question, the GTX 770, also recommends a 600W PSU even though you'll use use around 370W at full load).
post #2 of 15
Quote:
Originally Posted by Apolladan View Post

This is the PSU I'm using.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151027

+3.3V@24A, +5V@30A, +12V1@18A, +12V2@18A, +12V3@18A, +12V4@18A, -12V@0.5A, +5VSB@3.0A

Does the 12v rail being split matter?

Combined it's 72A, but on the sticker it says 41A max. Will being 1A short actually make a difference? I always take PSU recommendations from GPU manufacturers with a grain of salt since they've always been so inflated (the card in question, the GTX 770, also recommends a 600W PSU even though you'll use use around 370W at full load).

That model is at least 7 years old and thats a very long time for a PSU i would look around for a new one

And yes 41A is too litle for the newest high end video cards as you said it has 1A too little
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post #3 of 15
Thread Starter 
Quote:
Originally Posted by shilka View Post

That model is at least 7 years old and thats a very long time for a PSU i would look around for a new one

And yes 41A is too litle for the newest high end video cards as you said it has 1A too little

This review shows the card consuming around 200W at full load.

http://www.guru3d.com/articles_pages/geforce_gtx_770_review,5.html

Isn't that 16A?
post #4 of 15
Quote:
Originally Posted by Apolladan View Post

This review shows the card consuming around 200W at full load.

http://www.guru3d.com/articles_pages/geforce_gtx_770_review,5.html

Isn't that 16A?

I am not an expert on what parts use how much power on what loads and that sort of thing
But i can tell you 7 years for a PSU is like having a 50 year old car its very old
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post #5 of 15
Thread Starter 
Quote:
Originally Posted by shilka View Post

I am not an expert on what parts use how much power on what loads and that sort of thing
But i can tell you 7 years for a PSU is like having a 50 year old car its very old

I was told otherwise.

http://www.overclock.net/t/1352920/is-there-any-reason-whatsoever-to-replace-a-fully-working-power-supply-from-2007-for-my-next-build
post #6 of 15
If the PSU were new or slightly used, it would be more than sufficient for most systems equipped with a single GTX 770.

However, if you have had that PSU for a very long time, or used it heavily for several years, it might be rather borderline. They do age and degrade.

Don't put too much stock in the recommended PSU requirement; that's just the manufacturer covering it's bases in case of a shoddy PSU. A high quality one of much less than recommended rated power will be superior to a mediocre PSU that superficially meets recommendations. A single GTX 770 doesn't use any where near 42A on the +12v.

Rail splitting is largely irrelevant. If the rails are even independent, the OCP point is probably higher than 18A each, and you'll likely have two rails feeding the 770 and 36A is about double what a 770 will draw.
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post #7 of 15

I did not say you sould not use it i said it was old

Dont you have money for a new one since you want to use the old one
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post #8 of 15
Thread Starter 
Quote:
Originally Posted by Blameless View Post

If the PSU were new or slightly used, it would be more than sufficient for most systems equipped with a single GTX 770.

However, if you have had that PSU for a very long time, or used it heavily for several years, it might be rather borderline. They do age and degrade.

Don't put too much stock in the recommended PSU requirement; that's just the manufacturer covering it's bases in case of a shoddy PSU. A high quality one of much less than recommended rated power will be superior to a mediocre PSU that superficially meets recommendations. A single GTX 770 doesn't use any where near 42A on the +12v.

Rail splitting is largely irrelevant. If the rails are even independent, the OCP point is probably higher than 18A each, and you'll likely have two rails feeding the 770 and 36A is about double what a 770 will draw.

This is what I figured. At the very least, it's an extremely high quality unit and was very highly rated at the time. Also, while I've used it for a long time, I don't think I've ever pushed it past 300W (I have an E6750 and a 5770).

41A is 492W and even with degradation I probably won't come anywhere close to that.
post #9 of 15
Thread Starter 
Quote:
Originally Posted by shilka View Post

I did not say you sould not use it i said it was old

Dont you have money for a new one since you want to use the old one

I really like the fact that it's silent, so if I don't absolutely have to, I won't change it.
post #10 of 15
Quote:
Originally Posted by Apolladan View Post

I really like the fact that it's silent, so if I don't absolutely have to, I won't change it.

Answer to that could be this

Fanless PSU


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