ATI 3850/3870 Voltmod thread

[Eldonko]

voltmod made HIS3870ICeQ3
After a couple of seconds in 3D-mode, voltage chip falls from 1.46 to 1.15 V
What's wrong?

OCP on the HIS, once you raise the vgpu past 1.4v OCP kicks in and drops the voltage to 1.15v when you run 3D. I think that is what those extra couple resistors are doing when you compare to reference.

One thing you can try tho is a different BIOS. GeCube and Sapphire BIOS supposedly allow for more than 1.4v but I havent tried em personally. I always get the dam checksum error and am not sure how to change that.