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Windows 7: 2nd graphics card is running hot while the other is fairly cool?

18 Nov 2010   #51
JohnnyScience

Windows 7 64 & Ubuntu 64
 
 

Quote   Quote: Originally Posted by fseal View Post
It's not just the total wattage, you need to look at the amps supplied by the 12v rails. Especially if one of the rails is lesser amps than the other. With two video cards it can be a particular concern. If each card needs 22A max and you only have 38A of 12v...

(Of course the cards don't need their rated amps all the time, you can actually get away with it for a while but when specifically running a stress test or a game that fully unilizes the card then you could be over drawing the PSU)
I dont know how to answer you off the top of my head, where can I look to find the answer to the info youre requesting?


My System SpecsSystem Spec
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18 Nov 2010   #52
fseal

Windows 7 x64 Ultimate
 
 

The video card specs and your PSU specs (on psu it's usually on a sticker on the PSU itself) should list the ratings for the amps for the 12v lines.

So if one card requires 22 amps, x2 means the PSU has to supply at least 44 amps (and some spare for other devices).
My System SpecsSystem Spec
18 Nov 2010   #53
JohnnyScience

Windows 7 64 & Ubuntu 64
 
 

Quote   Quote: Originally Posted by fseal View Post
The video card specs and your PSU specs (on psu it's usually on a sticker on the PSU itself) should list the ratings for the amps for the 12v lines.

So if one card requires 22 amps, x2 means the PSU has to supply at least 44 amps (and some spare for other devices).
Ok took a look at the PSU & it has 12v1, 12v2, 12v3, 12v4 & all are listed as 20A

Looking for the specs for the Nvidia 9800GT, but havent found them yet.
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18 Nov 2010   #54
fseal

Windows 7 x64 Ultimate
 
 

That probably means that each of the single video card power connectors is 20 amps. If you can only hook one to the card then the card will only get 20 amps total. If you can connect two you can then get up to 40 possibly (can sometimes be hard to tell how they wired those connectors internally)

Edit:

Looks like that card needs +12V rating of 26 amps. So if there is only a single power connector on those cards, then your current PSU is underpowered to run them at full bore. If you can connect two power connectors to each card then you should be ok...
My System SpecsSystem Spec
18 Nov 2010   #55
JohnnyScience

Windows 7 64 & Ubuntu 64
 
 

Quote   Quote: Originally Posted by fseal View Post
That probably means that each of the single video card power connectors is 20 amps. If you can only hook one to the card then the card will only get 20 amps total. If you can connect two you can then get up to 40 possibly (can sometimes be hard to tell how they wired those connectors internally)

Edit:

Looks like that card needs +12V rating of 26 amps. So if there is only a single power connector on those cards, then your current PSU is underpowered to run them at full bore. If you can connect two power connectors to each card then you should be ok...
Yes each card has its own 6 pin power connector (no splitters or anything)

Dont I add up all of the 12v to get the total amps? So it would be 80 amps total?

So each card is getting 20 amps?

Someone said this on the nvidia forums:

To get the total number of amps on the +12v rails, add all the digits.

The 9800GT needs at least 26A total on the +12V rail(s)

So even if both cards needed 52 amps total, I'm still well above that with my 80amp 12v rail correct?

Am I understanding this properly?
My System SpecsSystem Spec
18 Nov 2010   #56
fseal

Windows 7 x64 Ultimate
 
 

Well I could be wrong but I was under the impression that the full 80 amps is not available on all connectors...

But if what you read is correct then yes you are definately good.

Now I have to tear apart one of my spare PSUs to determine exactly if that's true or not
My System SpecsSystem Spec
18 Nov 2010   #57
JohnnyScience

Windows 7 64 & Ubuntu 64
 
 

Quote   Quote: Originally Posted by fseal View Post
Well I could be wrong but I was under the impression that the full 80 amps is not available on all connectors...

But if what you read is correct then yes you are definately good.

Now I have to tear apart one of my spare PSUs to determine exactly if that's true or not
I cant say from my ownself, but like I said, it was from a member on Nvidia forums with about 8k posts (assume he knows what hes doing by now) and he said exactly: To get the total number of amps on the +12v rails, add all the digits.

Hopefully someone will come along and verify this.

I dont know what the other 12v cables are plugged into though? (I dont know if they are also 6pin like the two I have into each graphics card?)
My System SpecsSystem Spec
18 Nov 2010   #58
linnemeyerhere

Microsoft Community Contributor Award Recipient

Windows 7 Ultimate 64
 
 

12V is one on the mobo and 1-2 on each GPU cards and yes new cards are 6+8 pins each.
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18 Nov 2010   #59
JohnnyScience

Windows 7 64 & Ubuntu 64
 
 

So either way, I'm good to go right?

I did a lot of research when I first built this thing & this PSU was picked because it was going to be able to handle everything I wanted in a HTPC. Which included 4 monitors
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18 Nov 2010   #60
linnemeyerhere

Microsoft Community Contributor Award Recipient

Windows 7 Ultimate 64
 
 

I think so. I've gotten funny about power much like my stereo system more is better and great clean stable power is best. I wouldn't worry but be mindful of BSOD or frequent re-boots. I just recently went from 600 to 1050w on my PSU and I'm not running SLI yet.
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 2nd graphics card is running hot while the other is fairly cool?




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