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houseofbugs · 20-August-08, 10:06 PM

8-20-2008:

Welcome back! So between about 6pm yesterday and 5am this morning I have been working on the Vmod on my FoxConn card. I was able to get it installed and looking great but my card kept raising the voltage on its own up to 1.61 and then the over-voltage circuit protection would stop the card. I removed the mod and tried different resistors and that still did nothing. Now I was told by a friend that works for EVGA that the measuring points that the Vmod guide gives you will cause the capicators to burn up/explode. Now seeing as there are 100's of people that did the mod and no one reported any issues I decided to stick with it...not a great idea. Long story short my FoxConn 8800GTX is now short 1 SMC (surface mount capicator) but amazingly it still works (2D and 3D). In addition to losing a SMC the SMR (surface mount resistor) that regulates the memory voltage got messed up from the heat of the iron. I was able to correct that by removing the bad resistor and just soldering one end of a VR to ground and the other to where the SMR was and it worked! I currently have a steady 2.35 volts going to the RAM. I guess this is my guinea pig card for mods and accidents. When I was trying out TRI SLI I was pulling out the middle card and the FoxConn was on the bottom. Long story short the middle card did not come out normally and the back plate of the middle card wreaked some havok on the DVI port 2 circuitry. I was able to fix that as well (see last picture). I will say that since my old FX5600 Ultra these 8800's are the cards that I am now most familiar with. I know that if you just add a 10K ohm resistor from GND to the Vram SMR you will get 2.3-2.35V and to get the Vcore to 1.4-1.45V you need to add a 250 ohm from CND to the Vgpu SMR. They are really nice cards and relatively cheap.
Now I just have to try this out:
"Alternative points to measure the volatge on GPU of capacitors c565, C566, C567, and on the memory c622, C647, C688. They are located not far from the microcircuits, which control the appropriate volatge." ~XTReview.com
Apparently all these capicators have the capibility to measure the Vram and Vgpu voltages. I do not know if they will have issues but seeing as I have the money to replace 1 8800GTX and the FoxConn has seen better days I will be giving it a try later tommrow.
That is basically everything for now. I have some pictures of the Vmod installed on the card. The only change is that instead of a 10K ohm resistor that is on the board in the pictures I have replaced it with a 1K ohm VR. The 1Kohm VR will only be on the FoxConn card because of the SMR for the ram getting killed.
Pictures:

20-August-08, 10:06 PM		#3 (permalink)
houseofbugs Apex Advanced Techie	Re: 8800GTX Voltage Modding Worklog 8-20-2008: Welcome back! So between about 6pm yesterday and 5am this morning I have been working on the Vmod on my FoxConn card. I was able to get it installed and looking great but my card kept raising the voltage on its own up to 1.61 and then the over-voltage circuit protection would stop the card. I removed the mod and tried different resistors and that still did nothing. Now I was told by a friend that works for EVGA that the measuring points that the Vmod guide gives you will cause the capicators to burn up/explode. Now seeing as there are 100's of people that did the mod and no one reported any issues I decided to stick with it...not a great idea. Long story short my FoxConn 8800GTX is now short 1 SMC (surface mount capicator) but amazingly it still works (2D and 3D). In addition to losing a SMC the SMR (surface mount resistor) that regulates the memory voltage got messed up from the heat of the iron. I was able to correct that by removing the bad resistor and just soldering one end of a VR to ground and the other to where the SMR was and it worked! I currently have a steady 2.35 volts going to the RAM. I guess this is my guinea pig card for mods and accidents. When I was trying out TRI SLI I was pulling out the middle card and the FoxConn was on the bottom. Long story short the middle card did not come out normally and the back plate of the middle card wreaked some havok on the DVI port 2 circuitry. I was able to fix that as well (see last picture). I will say that since my old FX5600 Ultra these 8800's are the cards that I am now most familiar with. I know that if you just add a 10K ohm resistor from GND to the Vram SMR you will get 2.3-2.35V and to get the Vcore to 1.4-1.45V you need to add a 250 ohm from CND to the Vgpu SMR. They are really nice cards and relatively cheap. Now I just have to try this out: "Alternative points to measure the volatge on GPU of capacitors c565, C566, C567, and on the memory c622, C647, C688. They are located not far from the microcircuits, which control the appropriate volatge." ~XTReview.com Apparently all these capicators have the capibility to measure the Vram and Vgpu voltages. I do not know if they will have issues but seeing as I have the money to replace 1 8800GTX and the FoxConn has seen better days I will be giving it a try later tommrow. That is basically everything for now. I have some pictures of the Vmod installed on the card. The only change is that instead of a 10K ohm resistor that is on the board in the pictures I have replaced it with a 1K ohm VR. The 1Kohm VR will only be on the FoxConn card because of the SMR for the ram getting killed. Pictures: