ATI 3850/3870 Voltmod thread

[ORVILLE]

My Gecube PCB is slightly different to most others. It does not have the resistors that are used for most other pencil mods. As well as that, bios voltage mods do not work for this board (deafult always stays 1.25v in both 2d/3d).

Anyhow here is the pencil mod that works for me. BE WARNED - do not reduce the resistance too much - one or two strokes of a 2B pencil is enough and always use a volt meter. My first attempt ended in 1.76v being fed to the GPU.

Default Resitance OF 2.44K gave me 1.25v and 770Mhz limit
Modded Resitance at 2.2K gives 1.42v and 877Mhz Crysis stable