Vrzone.com Article: Overclocking the EVGA 8800GTX ACS3

Printed On: May 16, 2008, 7:40 pm
Category: Overclocking
Type: Guides
Posted By: Shamino
Date Posted: November 11, 2006, 8:11 am

EVGA 8800GTX ACS3 Edition

What do you do when you have 2 of these babies sitting on your bed?


Get some mad cap High Def gaming going!

 

Or get ready for some Overclocking fun. Now, these cards are pretty challenging for third party coolers, as there aren't that many ready to be bought yet. So what do I do? First, I took a small copper chipset cooler and mounted on with nuts, bolts and a small cut out plastic clamp plate.

Take note that the 2 holes are not directly centered over the small chip, so I made the clamp plate a little fatter on one side to compensate. There... will that do for cooling the chipset though? Yes, it's more than adequate these chips don't run hot at all.

Next, I took some RAM sinks I got from UVnium and stuck them onto the PWM area:

 

What about the core area? The core is huge with the heatspreader, and the mounting holes are different from previous cards. The mounting hole dimension is 58.25mm from center fo hole to center of hole, and a square around the core. You will need 2mm to 2.5mm screws to pass through the mounting holes.

To do some nice Dry Ice/Liquid Nitrogen Cooling on the card, I got my friend Vinnzz to cook me up some solid copper Containers:

So... what's next?? Well I know many of you are messaging me to get this out so here it is, the voltage mods for the cards!!

*Take Note that all physical Modifications Void your warranty!*

First you've got your GPU Core mod:

Locate the Primarion PX3540 Core Voltage Regulator. Solder a 400ohms to 500ohms variable resistor to the side of resistor seen above. Connect other leg of VR to ground, and set VR to maximum resistance. Tune down resistance to increase voltage.

For Memory voltage, spot the small AT regulator and solder a 20K ohms VR to side of resistor marked above. Or you can pencil it to increase voltage.

Here's where you'll measure voltages:

Default VGPU is 1.26v under load and default Memory Voltage is 1.95v. Please be sure to have very good cooling when you voltage mod!


Single and SLI Overclocking!

Now, let's put this altogether and slap the cooler onto the EVGA 8800GTX ACS3 Edition!!! But what board to run this on?

My Cascaded and Volt-modded EVGA NForce 680i SLI!!

 

Now let's do some Dry Ice runs! With -40C cooling, I got this card to 842MHz Core, and 1240MHz Memory!!

What da hell?? 17,597 3D Mark 06 with just single card?? That's easily over what extremely overclocked 7900GTX SLI can get! Good stuff!! But.... time to go SLI yea??

 

I love this picture man, the solid container is so masssive I had to use a wooden peg so she doesn't snap the motherboard!!

22,799 3D Mark 06 with just 822/1240!! In SLI Mode, it's all CPU bottlenecked now, I need more CPU Power. Like in Game Test 1, I get same frame rate at stock GPU clocks. More overclocking to come for sure!

Remember, this was done on a pair of these babies:

Check out our review of the 8800GTX and the EVGA NForce 680i SLI!


Discuss This Review in our Forum

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