is there a VI/O mod to go higher than 3.87 and get vcore to 2.6 or something

for a7v133
my VI/O is already at 3.86 but i need more and after a jump up MB voltage i will need to now how to get higher then 2.5 VCORE. syetem has 2* 300 watt psu's attached to a Y connector
(trying to get a friends duron 650 past 1140 ( 7.5 * 152) )

Hi cooked, I don't know about the voltmod, but I really need to hear if u have made some screen shot's of ur 2 gig T-bird? If u have please post them.
Thanks