Not sure if that helps but I noticed that in the 4850/4870 voltmod thread,one of the Vgpu mod possible point is labeled C601 ... It may indicate that the LED D601 and Vgpu are somehow related
Here are the posts about C601: http://www.xtremesystems.org/forums/...7&postcount=35
http://www.xtremesystems.org/forums/...&postcount=108
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