I'm having problems getting a 3rd GPU working / folding.
 
I have a MSI x58 Pro-E motherboard which has 3 PCI-E x16 Gen2 (2x16, 1x4) slots 
Evga GTX 580 SC  <--- Only card w/ Monitor connection. OCed and folding fine
Evga GTX 260  <---- Add 4 days ago. OCed and folding fine
MSI GTS 8800  <---- In the 1x4 slot.  Just moved from another working system
Nvidia 285.79 Windows 7 64-bit drivers
 
Windows Device Manager shows "Video Controller (VGA Compatible)". If I go to right click. update drivers, it say the Nvidia GeForce 8800 GTS is already installed and up to date.
 
Neither Evga Precision v 2.1.1 or FAH GPU Tracker v2 v3.54 see the MSI GTS 8800 card at all.
 
I'm at a lost for how to better troubleshoot. Any thoughts?
 
 

pull it out. 
start up your machine and allow to boot fully.
 
shut down.
re-install the card
 
re-boot
 
sometimes does the trick
 

how big is your power supply and if you do get it to work keep a eye on your 24 pin power plug  these two yellow wires watch them
  and yep them 2 yellow wires are alittle burnt

good catch Asus! I forgot about that.
 
might be a good idea to pick up one these OP
 

ohh i need 1 of those  cause a 1000watt  and three cards don't work for me

asus939


ohh i need 1 of those  cause a 1000watt  and three cards don't work for me

It doesn't really have any interaction with PSU capacity - rather, that modern video cards tend to draw too much power from the motherboard (more than they should), and that much draw can damage the motherboard power connection.
 
So the purpose of the adapter is simply to provide another channel of power to the PCI-E slots off the PSU that does not have to go through the motherboard connector.

Using the Cosair AX 1200.. Spared no expense here, so it better not be the PSU. 
 
Wires are all black, but appear fine at the +4 connector.

bowlinra

 I'm having problems getting a 3rd GPU working / folding.

I have a MSI x58 Pro-E motherboard which has 3 PCI-E x16 Gen2 (2x16, 1x4) slots 
Evga GTX 580 SC  <--- Only card w/ Monitor connection. OCed and folding fine
Evga GTX 260  <---- Add 4 days ago. OCed and folding fine
MSI GTS 8800  <---- In the 1x4 slot.  Just moved from another working system **Non-Working One**
Nvidia 285.79 Windows 7 64-bit drivers

Troubleshooting Steps:
1. Kept GTX 580 (In First slot x16) Removed GTX 260 (In Mid Slot) and Reseated GTS 8800 (In bottom 1x4 slot) Rebooted and didn't see the GTS 8800 cards. (No Good)
2. Kept GTX 580 (In First slot x16) and Moved MSI GTS 8800 (In Mid Slot x16)  Rebooted a few times and EVGA Precision & FAH GPU Tracker could see and manage both cards. (Better)
3. Kept GTX 580 (In First slot x16) and kept GTS 8800 (In Mid Slot x16) and Add GTX 260 (In Bottom Slot x4) Rebooted, had to rearrange all the icons on my desktop and EVGA Precision & FAH GPU Tracker could see and manage all cards. (SCORE!)
 
Side Effects:
- Had to rearrange all my desktop icons.
- EVGA Precision GPU # doesn't match the FAH GPU Tracker GPU # (It's not in the same sort) * Anyone know how to change the GPU # in either program?
- I presumably EVGA Precision due to several card changes lost all the OC profiles.
- GTX 260 is in a PCI-E (x4) slot ** Any thoughts to PPD impact on the slower slot?
- GTS 8800 is in the Mid slot (x16) and OC (620/1240/850) is running hot 86C with 100% fan.  **Update cards is overheating, dropped back to stock speed and over night it hit 96C.
- With 3 GPUs I needed to jump up the auto Fan monitor profile up by 10% for the GTX 580 & 260 and running fixed to 100% on the GTS 8800.
 
Conclusion:
- I'm thinking the MSI GTS 8800 will not run in the (MSI x58 Pro-E Bottom PCI-E 16 slot in x4 mode), but the GTX 260 will.
Any other theories?

Glad everyone agree with me..

it's an odd one. They should all run in any of the slots x16 x8 x4. 
Things could be being picky because you are running 3 different generations of cards at the same  time, which is hard on the drivers.
 
If worst comes to worst, take the 8800 out.  You'll probably get your ppd back on the CPU by removing that GPU plus you'll have less heat.
 
AFAIK you cannot change the slot#. Try disabling gpu folding in Tracker, stop the program, exit, wait a few minutes, then re-start and re-enable gpu folding (make sure you tick the auto detect gpu box).  If that does not work, try deleting and re-installing tracker.
 

Simba123

 If worst comes to worst, take the 8800 out.  You'll probably get your ppd back on the CPU by removing that GPU plus you'll have less heat.
 

I agree with you and removed the 8800. The new 803x project units was creating a heat build up problem with the GTX 580 right next to it.

I've pulled out the GTS 8800 and brought in a GTX 460
Evga GTX 580 SC  <--- Top Slot (closes to CPU) Stock 797/1594/2025 @ 83C w/ fan at 85% (Getting too hot)
Evga GTX 460  <--- Mid Slot OC 850/1700/1800 @ 64C w/ fan at 70%
Evga GTX 260 <--- Bottom Slot (closes to PSU) OC 735/1584/999 @ 58C w/ fan at 60% (Can't overheat this one)

and to get it this cool, I have my window cracked open with 7C air flowing directly on the case. Closing the window causes the GTX 580 to climb to 90C.
 
Maybe switching the 260 & 460 cards? Although the 260 appears EE and longer than the Non-EE 460. The 580 has to same in the Top slot for gaming and monitor connection. Thoughts?

Leave it where it is.
 
 If you swap the 460 and 260, the 260 will just end up sucking in hot air from the 460, and being and EE model, they don't like that and tend to overheat more quickly than non EE models.
 
Though if you really want to, you could try swapping them, but I think you'll find the temps increase.
 
If you have the side off the case, put a desk fan there. that will help lower the temps.  Taking the side off destroys the natural airflow in the case; putting a desk fan against the open side basically blasts everything with fresh air and will lower your temps.
 
 

Simba123

 If you have the side off the case, put a desk fan there. that will help lower the temps.  Taking the side off destroys the natural airflow in the case; putting a desk fan against the open side basically blasts everything with fresh air and will lower your temps.

My Cooler Master HAF 932 has a 230 x 30mm (9in) fan over the video cards, and 2 more on both the Top and Front, rear has 140 x 25mm. I was hoping that was enough.

Simba123
 
If you swap the 460 and 260, the 260 will just end up sucking in hot air from the 460, and being and EE model, they don't like that and tend to overheat more quickly than non EE models.

So what the proper card setup EE or Non-EE for 3 GPU side by side? Should they be all EE or all Non-EE? Mixture?
 
 

what are your top fans set to? intake or exhaust? if they are intake, change them to exhaust.
 
I only mentioned the desk fan because you said you have the window cracked open - I now see you mean window to your house, not window to the computer .
 
Generally I put EE cards at the bottom because they have a tendency to overheat more easily than other cooling solutions, so having them above other graphics cards where they are sucking in hot air is a situation to avoid where possible.
 

Simba123

 what are your top fans set to? intake or exhaust? if they are intake, change them to exhaust.  Set to Exhaust

I only mentioned the desk fan because you said you have the window cracked open - I now see you mean window to your house, not window to the computer . Yea open the window just while I sit here on the internet.

Generally I put EE cards at the bottom because they have a tendency to overheat more easily than other cooling solutions, so having them above other graphics cards where they are sucking in hot air is a situation to avoid where possible.

Yea my GTX 580 is EE and on the Top, it must be pulling in the hotter air below.
 
How is everyone else running 3+ GPU OCed and not cooking the Highest card in the stack?