Friend and novice Over-clocker owns P45 mobo

[BonzaiDuck]

CPU PLL Voltage:

I can eventually find this. I don't have this feature on my 780i mobo.

What is it? what does it do? What are considered acceptable limits?

[Big Lar]

CPU PLL Voltage - Values range from 1.5v to 2.78v in 0.02v increments. In a nutshell, before anyone asks, a CPU PLL is a low voltage differential signal. Raising this may help stabilise high frequency FSB's on the CPU.

^^Borrowed from a thread by Dee at Xtremesystems.

Larry

[BonzaiDuck]

I see over-clocking examples with the P45 chipset in which this voltage is left on "Auto."

I'm guessing that this feature auto-sets to the minimum? 1.5V? So it might be useful to knock it up a notch or two when encountering troubles above -- what? 400Mhz? 450Mhz?

Also, there is a feature called something like "DRAM skew for channel [1/2/3/4]." The over-clock examples I've seen leave it set to "auto" as well. What are those settings for?

With these new additions to BIOS options for Intel chipsets, we should help Graysky update his Over-Clocking sticky again.

[scruffypup]

The cpu PLL voltage on this chipset should be on auto. You should have no problems hitting a good overclock without messing with this.

Now, if you want to get a very high FSB (no magic number,.. just overclock as normal to get where you want) and are getting close to stable, but not quite,... then yes you might want to try bumping it up a little at a time to see if you can get that stable,.... I have heard that going over 2.0 on this setting can sometimes damage the processor,... so use cautiously I would say.

The DRAM skew, I am not quite as familiar with, however looking at it, I would say definitely leave on auto when clocking higher, especially with tighter ram settings as it looks like it could really create a mess in the RAM if one doesn't fully understand the interations of other ram timings, overclocked ram and skewing in conjunction (This is just my opinion on what it looks like it does though)

[BonzaiDuck]

Originally posted by: scruffypup
The cpu PLL voltage on this chipset should be on auto. You should have no problems hitting a good overclock without messing with this.

Now, if you want to get a very high FSB (no magic number,.. just overclock as normal to get where you want) and are getting close to stable, but not quite,... then yes you might want to try bumping it up a little at a time to see if you can get that stable,.... I have heard that going over 2.0 on this setting can sometimes damage the processor,... so use cautiously I would say.

The DRAM skew, I am not quite as familiar with, however looking at it, I would say definitely leave on auto when clocking higher, especially with tighter ram settings as it looks like it could really create a mess in the RAM if one doesn't fully understand the interations of other ram timings, overclocked ram and skewing in conjunction (This is just my opinion on what it looks like it does though)

How many years have we been screaming at mobo makers to write manuals that didn't just have entries like this:

"CPU VTT Voltage [Auto] . . . Configuration options: [Auto] [1.2V] [1.25V] . . . . [1.5V]"

Once I wrote to ASUS saying "You're user-manuals suck!" They didn't like that. I stopped getting responses to my questions. Do you think that mobo-makers have a "black-list" of user-inquirers?