Gold Leader,do not know if this helps,but i have a GTX 590 that i put a water block on a few years ago.
Still have some picks take a look.
There are two connectors on the pcb the green circle one is for the fan and the red one is for the leds.
You can see the led connector is a four pin connector.

GREAT NEWS!!!!!!
 
IT REALLY WORKS!!!!!!
Yeah I freaked out and I became UBAR happy for a bit there xDDDD hahaha xDDDD
 
Kram36 you made my day mate!!!! I also used GPU-Z 0.4.4 first, just to make sure it worked, after that I used GPU-Z 0.7.3 and o issues at all :)
 
So! YES!! I am about to reveal a GTX 480 no one has seen outside NVIDIA Cooperation!
 
Most of us might thing a GF100 VGA card and 1536MB 384Bit GDDR5, well I am about to reveal it's secrets!
 
Here my GPU-Z & Driver info screenshot!

 
Well it does have 480 CUDA Cores BUT it has 1280MB 320 Bit GDDR5!!!!
So Actually it's like what a GTX 570 has become... Talk about weird right!
 
So this is what it is + some specs:
NVIDIA GeForce GTX 480 PCI-E 1280MB 320Bit GDDR5 Rev.A2 5009 Gamma Board / Engineering Sample
GPU Speed = 527Mhz instead of 700Mhz
CUDA Core Speed = 1053Mhz instead of 1401 Mhz
Ram Speed is 700Mhz instead of 924Mhz
 
Talk about being entirely different!!! Maybe this card was used to design the GTX 470 & GTX 570 as a later reuse of this old idea?
Everest Ultimate is next, if any of you know other programs I can use to reveal it's inner self, please post them , So far I thank Kram36 greatly for finding that vital information!!!
 
Update!
 
After running Fire6.exe from Ex-3dfxEngineer Hank Semenec, this program was to stability test 3dfx Engineering Samples, and I was sure this was the tool to begin with as 3D went.
Fire6.exe ran dead stable with FSAA x32, AF x16 + TAA x8 Super Sampled, as you can see here:

 
After that I was very confident that I could get some games going, I chose Dirt2, as being this is the first DX11 game made and I was sure it would run it just fine.
 
The settings I used was the following:
 
max details in DX11 Mode + FSAA x8 AF x16 + TAA x4 Super Sampled.
In some places you could see that 1280MB 320Bit GDDR5 wasn't enough, as if the card ran out of ram xDDD But besides that the card ran dead stable and there was no screen issues like page tearing, banding or heavy glitching throughout the game.
 
Here I made a two 1080p video's of the GTX 480 Rev.A2 5009 in action:
 
GTX 480 Rev.A2 5009 ES Test Run 01:

 
GTX 480 Rev.A2 5009 ES Test Run 02:

 
They were made, just to verify you all that I have a stable functioning Rev.A2 Engineering Sample of the GTX 480
This is as real as it is going to get, of a functioning GTX 480 ES with 1280MB 320Bit GDDR5, so far this card has never been put online in such detail
 
I was also able to get BarsWF x64 CUDA Client running:
 
Here of the GTX 480 ES:

 
Here of the EVGA GTX 480, just to compare:

 
This is what you get when booting the system:

 
You get that cool looking white boarder around the primary image and during the Windows Startup sequence, the image is disrupted with vertical lines, when using a different driver than 258.96 WHQL your desktop will look like this also and then when you move the mouse about it's like MS Paint, as you can draw around with the mouse.
 
The only driver that is stable in Windows is 258.96 WHQL, the only place I get them vertical lines is during the Starting Windows Sequence, for the rest it looks normal and healthy.

Super! What are the temps like on this card?

Here some pics of a GTX 480 ES Rev.A1 4109:
 
Top view:

 
Rear view:

 
Closeup of the hand done rework & J503, a 7 pinned connector, pic shows 8 holes, but 7 of 8 are connected, J503 was used to debug the card's GF100 & Bios chip, it may also have been used to program them, but that is well worth finding out!

 
Here a closeup of the rear end, showing them famous PCB holes , which even the productions models also have:

 
I still seek this card and hopefully one day I will acquire it

Fascinating mod. Thanks for sharing!

Here a new photo I took of the NVIDIA GeForce GTX 480 PCI-E 1280MB 320Bit GDDR5 Rev.A2 5009 Engineering Sample in action with it's GeForce Led Logo!!

This is probably the best photo if I ever took of it as well!

Erm that black tape is electrical tape And the advantage is that this is easier to maintain But the effect is the same and some GTX 480 Engineering Samples had the leds done this way, so that being said it's not lacking anything from an original Engineering Sample for that matter, this is still 1 of 5 in the world with functioning Leds within collectors hands and I am very proud of being the owner of this ultra rare, all thanks to Loschzwerg for getting them Leds made as well

Yeah true thing is I can't do such things due to my Chronic Illness my hands are too shaky and I would only break things as for how Loschzerg done it, he did it for free for me, I am pretty sure he knows what he is doing, it is fine the way it is, the function is the same and most say --> If it works, why fix it?
 
But I know what you mean, my 3dfx Voodoo5 6000 AGP 128MB Rev.A 3700 Engineering Sample had them Black Heat Shrinks done for it's Internal Power Connectors, which was done by Sir Hank Semenec, Ex-3dfx Engineer, wo also took part of the 3dfx Voodoo5 6000 & 3dfx Daytona Programs:

 
Here the closeup:

 
But not to worry I only let people I tust fix my hardware for that matter and I know Loschzwerg all too well, he has the ability to even do BGA reflows for that matter
He did a fine job on my GTX 480 ES, no need to question him for his work either, I am Obi-Wan Kenobi from x-3dfx FYI, I have a lot of 3dfx, NVIDIA< EVGA & AMD Contacts that do similar things as such things go, this isn't new for me dude.

Burke888
Gold Leader I just wanted to say I really enjoyed the thread and your excitement for the engineering samples really shines through your posts. It was fantastic to get to see some photos of those. To a technological laymen like myself, the most fascinating aspect to me was just has drastically different the cooler for the Geforce GTX 480 engineering samples were.
 
The retail card's cooler is completely different. This was a great thread. I usually just lurk but I really wanted to express my gratitude and appreciation for posting such detailed pictures of something most of us will never see.
Thanks!

Many thanks for your kind reply Burke888
 
Well I always was very in to Engineering Samples, mainly from 3dfx in my old days, you might love to give this thread a read too 
http://forums.evga.com/tm.aspx?m=2030876
 
Lots of my 3dfx material can be found in that thread, where my passion for VGA card collecting all began and the multiple layouts of the Voodoo Table which I now name the VGA Table