I'm surprised I didn't see a topic on this, so I thought I'd start one. If you have a Core 2 Duo CPU, please post your undervolting experiences! I'm done testing the overclocking limits, so now I'm going in the other direction.
Intel Core 2 Duo E6600 2.4 GHz
Gigabyte GA-P965-DS3, F7 BIOS
2 x 1 GB Patriot PDC22G5300LLK DDR2-667
ATI Radeon X1900XT 512 MB
SeaSonic S12-500, Rev. 2
BlueGears b-Enspirer 7.1
P3 International KILL-A-WATT AC power meter
3.5 GHz (389x9), 1.487v, 157W idle, 214W Prime95, 239W TAT
3.4 GHz (378x9), 1.425v, 147W idle, 200W Prime95, 220W TAT, 14.9s SuperPI
3.3 GHz (367x9), 1.375v, 141W idle, 188W Prime95, 205W TAT, 15.5s SuperPI
3.0 GHz (334x9), 1.250v, 126W idle, 163W Prime95, 173W TAT, 17s SuperPI
2.4 GHz (266x9), 1.325v, 117W idle, 163W Prime95, 170W TAT, 21.1s SuperPI**
2.4 GHz (266x9), 1.1625v, 117W idle, 145W Prime95, 146W TAT, 21.1s SuperPI**
2.4 GHz (266x9), 1.025v, 109W idle, 133W Prime95, 134W TAT, 21.1s SuperPI**
* EIST disabled, C1E halt enabled for all tests. CPU normal vcore reads as 1.325 volts. Memory kept at or above DDR2-667 (4-4-4-12) using 2.0-2.5x multiplier. All results were verified stable by passing 12 or more hours of Prime95 (actually, SP2004 with custom settings to max out memory usage) AND 12 hours of 3DMARK06 (racked up 100 KWh this month on computer alone to prove it!).
** This result is using stock settings, except for 2.5x memory multiplier to reach DDR2-667. EIST and C1E were enabled.
I'll post more results as I have them.
EDIT: 11/6/06 - More data: stock results, SuperPi
EDIT: 11/12/06 - Results at minimum EIST voltage (1.1625v)
EDIT: 11/13/06 - Results at 1.025v
Last edited by GHz on Mon Nov 13, 2006 8:53 am, edited 4 times in total.