Quote Originally Posted by hollo View Post
and Vcc has worked for a lot of people, but the pentium d spec sheet i looked at suggests that Vtt is the 'correct' voltage to use.
Why do you use a pentium d data sheet? This mod is used for core 2 duo(quad) so whu dont you look at a core 2 duo(quad) data sheet?

And if i look at the c2d datasheet, this is what i see

FSB Frequency Select Signals (BSEL[2:0])
The BSEL[2:0] signals are used to select the frequency of the processor input clock(BCLK[1:0]). Table 17 defines the possible combinations of the signals and thefrequency associated with each combination. The required frequency is determined bythe processor, chipset, and clock synthesizer. All agents must operate at the samefrequency.The Intel Core2 Duo desktop processors E6850, E6750, E6550, and E6540 operate at1333 MHz (selected by the 333 MHz BCLK[2:0] frequency). The Intel Core2 Duo desktop processors E6700, E6600, E6420, E6400, E6320, and E6300 operate at 1066 MHz (selected by the 266 MHz BCLK[2:0] frequency). The Intel Core2 Extreme processor X6800 operates at a 1066 MHz FSB frequency (selected by a 266 MHz BCLK[1:0] frequency). The Intel Core2 Duo desktop processors E4500, E4400 and E4300 operate at a 800 MHz FSB frequency (selected by a 200 MHz BCLK[1:0]
frequency).

Nothing about vtt.