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basic GPU question

post #1 of 18
Thread Starter 
My apologies, the highest card I've owned to date is a gtx 660.
On higher end cards that have an 8 pin + 8 pin (or 8 pin + 6 pin) connector how is it hooked up from the PSU?
1) From a single cable on the PSU the GPU cable daisy chains (series) two plugs (8 + 6 if i recall correctly)
2) Two separate cables from the PSU

My apologies for such a newb questions.

I have the following GPU if it matters and plan to pick up a 770 soon.
www.newegg.com/Product/Product.aspx?Item=N82E16817151132
post #2 of 18
Quote:
Originally Posted by buffnerd View Post

My apologies, the highest card I've owned to date is a gtx 660.
On higher end cards that have an 8 pin + 8 pin (or 8 pin + 6 pin) connector how is it hooked up from the PSU?
1) From a single cable on the PSU the GPU cable daisy chains (series) two plugs (8 + 6 if i recall correctly)
2) Two separate cables from the PSU

My apologies for such a newb questions.

I have the following PSU if it matters and plan to pick up a 770 soon.
www.newegg.com/Product/Product.aspx?Item=N82E16817151132

Your psu will be fine.

and to answer the question either way will work.

currently I have a 290x, and am currently running it off one cable that has both 6 pin and 6+2 pin conenctors on it to rid of cable clutter and it loads and OC's just fine. thumb.gif

Always better to ask and be sure, than to not ask and have something potentially bad happen.
post #3 of 18
Thread Starter 
Quote:
Originally Posted by Xinoxide View Post

Your psu will be fine.

and to answer the question either way will work.

currently I have a 290x, and am currently running it off one cable that has both 6 pin and 6+2 pin conenctors on it to rid of cable clutter and it loads and OC's just fine. thumb.gif

Always better to ask and be sure, than to not ask and have something potentially bad happen.

Thanks for the help there.
To ask another question related to PSU. What is the +12v rail (single) etc. mean?
post #4 of 18
Quote:
Originally Posted by buffnerd View Post

Thanks for the help there.
To ask another question related to PSU. What is the +12v rail (single) etc. mean?
12v rail is the line that delivers power to PCI cards via external power. So an example would be the 8 or 6 pin connectors. The 3.3v and 5v are all to different areas of the computer. I'm not sure what they go to exactly.
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post #5 of 18
Quote:
Originally Posted by AcEsSalvation View Post

Quote:
Originally Posted by buffnerd View Post

Thanks for the help there.
To ask another question related to PSU. What is the +12v rail (single) etc. mean?
12v rail is the line that delivers power to PCI cards via external power. So an example would be the 8 or 6 pin connectors. The 3.3v and 5v are all to different areas of the computer. I'm not sure what they go to exactly.

Quote:
Originally Posted by buffnerd View Post

Quote:
Originally Posted by Xinoxide View Post

Your psu will be fine.

and to answer the question either way will work.

currently I have a 290x, and am currently running it off one cable that has both 6 pin and 6+2 pin conenctors on it to rid of cable clutter and it loads and OC's just fine. thumb.gif

Always better to ask and be sure, than to not ask and have something potentially bad happen.

Thanks for the help there.
To ask another question related to PSU. What is the +12v rail (single) etc. mean?

I beleive the benefits of a single 12v line have to do with uneven load accross the psu. some higher end psu's with multiple 12v rails manage ways around this by having them seperated from the rest of the psu.

I am not 100% sure on this, I will see if we can get someone like shilka to enlighten us.
Edited by Xinoxide - 3/11/14 at 2:06pm
post #6 of 18
Quote:
Originally Posted by Xinoxide View Post

I am not 100% sure on this, I will see if we can get someone like shilka to enlighten us.
+1 for shilka. We could also use TwoCables.
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post #7 of 18
I know shilka is online, not sure on twocables. I linked shilka here, should be a nice short answer for him. biggrin.gif
post #8 of 18
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post #9 of 18
Sory i dont understand the question
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post #10 of 18
Personally I prefer to have a single large 12V rail than multiple smaller rails, just because it can simplify load distribution. On a unit with separate rails, you need to pay closer attention to "where" you plug the devices in on the PSU. It's possible to overload individual rails by plugging too many devices into modular plugs that feed off the same rail.

Biggest down-side against PSU with single 12V rail designs is that in the event of a short circuit, you're more likely to have a fire or serious component damage inside the case. It's up to the PSU manufacturer to implement over-current protection on individual modular outputs, and quite a few don't do that.

Greg
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