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The vmod on the GPU is on the ISL chip. Pin 5 to ground. At 15K Ohms the voltage increases from the stock setting of 1.45 to 1.5v. Ran it up to 7.54K Ohms and got 1.55v. This allowed me to bench at 525/976 on 2001 and 520/976 on 2003. Cooling has still not been modded as of yet so I did not take it any farther. Ran the mod on the 6012 chip however got heavy artifacting even though it would run up to 525/1009. This indicates to me (at least as of this time) that the ram is not up to the task of running at those speeds. Without the vmod with the card at 525/990 it would kick down to the slower speeds seen in 2D. For now 976 will have to suffice and I will not leave the 6012 mod in place. Now for the results.
Ran the voltage up to 1.65v on the GPU. This achieved 535/976. Not bad for the 5900XT. Brought up 2003 and started running it. Scores where looking really good however I was somewhat alarmed when about half way through the artifact free run, there was a spectacular ball of flame and sparks that came from the vid card. We are talking a rather large ball of fire. Really brightened up the room it did. One of the benefits of testing at night is the spectacular fire works show. For those unaware, this really is not a desired effect. I now have a very burned, eight leg chip (id unknown due to the numbers being burned off), located next to the ram, towards the end of the card on the front side. Seems that though the GPU can handle the voltage, there appears to be a circuit that can not on the 5900xt. Too bad as the in the first test, when the fighter is firing, the fps got up to 1,000. Would have been a good run however it needed to complete it without frying the card.
At any rate no further damage done to the computer and presently have a backup 4200 in it.
I hope this helps you, and me too, because yes, I'm looking for a GPU Vmod too for my Club3D 5900XT ;)