***ASUS Rampage IV Extreme Owners Thread***

[Raja@ASUS]

Not sure about this "bclk sweet spot" theory. What do you asus guys have to say about that?

Assuming there are no major differences in memory frequency, it is entirely possible that asking the internal PLL for a greater level of multiplication of the reference clock produces more phase error or increases jitter. If that were to be the case, increasing Vcore and tuning the voltage of any other related bus becomes necessary to counter any loss in sampling margin (may not always be successful either).

[Eldonko]

Very interesting, tested and confirmed this myself and for this CPU Im finding bclk 130-133 to be optimal. For example, dropping to 100.00 x 50 requires 0.045v more on vcore for stability than 131.6 x 38.

Are all CPUs going to be totally different for optimal bclk or is a 130-133 range going to be optimal for several CPUs? I would try for myself but I only have 1 CPU here right now.

Assuming there are no major differences in memory frequency, it is entirely possible that asking the internal PLL for a greater level of multiplication of the reference clock produces more phase error or increases jitter. If that were to be the case, increasing Vcore and tuning the voltage of any other related bus becomes necessary to counter any loss in sampling margin (may not always be successful either).

[Raja@ASUS]

Very interesting, tested and confirmed this myself and for this CPU Im finding bclk 130-133 to be optimal. For example, dropping to 100.00 x 50 requires 0.045v more on vcore for stability than 131.6 x 38.

Are all CPUs going to be totally different for optimal bclk or is a 130-133 range going to be optimal for several CPUs? I would try for myself but I only have 1 CPU here right now.

You may find that going to 125MHz and upwards is a bit more forgiving than 100 BCLK when it comes to Vcore on all CPUs (where possible).

-Raja

[Eldonko]

Good info thanks. I dont think many ppl realize this and shoot for 100 x 50 or similar like they have been doing on SB-E and as a result have to use more vcore. Ive been running 132 all along but that was just out of luck bc it was what I needed for mem optimization.

You may find that going to 125MHz and upwards is a bit more forgiving than 100 BCLK when it comes to Vcore on all CPUs (where possible).

-Raja