- Nov 4, 1999
- 24,123
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[update]Confirmed yes - Vcore, CPU PLL, NBv & vFSB term., possibly not vDIMM (to be confirmed).
I know the vcore is automatically bumped up as FSB speed is increased, I can see that in the bios & CPU-Z etc.
Does the bios do the same thing to the chipset voltages?. Annoyingly the bios does not show actual chipset voltages etc, unlike the ROG version.
[update] All my voltages on manual now.
Anyone know for sure?
TIA
Btw this mbrd is running a Q6600 G0, currently @3.35GHz, 372 MHz FSB.
[update] So far I have found out that not just on auto, but also on the lowest (base) manual setting for the CPU PLL & vFSB that this mbrd heavily over volts these 2 settings above a certain (unknown) FSB.
This article originally linked by n7, shows that at 400MHz FSB the CPU PLL is at 1.83v on the 1.5v setting & the vFSB is at 1.43v on the 1.2v setting!:Q. They latter found out that with a 45nm CPU the vFSB over-volts far less on auto or the lowest setting but it's still worth chosing at least the 2nd lowest manual setting. (Checkout their thread related to the article for numbers).
My rig is at 372MHz FSB & I found (using a Digital Multi Meter & measuring points from the linked article above) that the CPU PLL was at 1.81v for the 1.5v setting! & the vFSB was at 1.31v for the 1.2v setting, not as bad but still significant.
Setting the CPU PLL voltage to 1.52v brought it inline to 1.54v.
For my Q6600 G0 (65nm), vcore setting 1.40625v
At all the tested FSB speeds I noted the following :-
CPU PLL 1.52v setting = 1.545v
vFSB Term. 1.22v setting = 1.229v.
At 362,372 & 392 FSB CPU PLL & vFSB Term at base manual settings of 1.5v & 1.2v was exactly the same as auto (& probably is for all FSB speeds).
'Actual' voltages are measured using my digital multi meter.
FSB _ CPU PLL setting _ actual _ FSB Term. setting _ actual
333 ______ auto ______ 1.722 ______ auto _______ 1.315
342 ______ auto ______ 1.820 ______ auto _______ 1.315
352 ______ auto ______ 1.820 ______ auto _______ 1.315
362 ______ auto ______ 1.820 ______ auto _______ 1.315
372 ______ auto ______ 1.820 ______ auto _______ 1.315
382 ______ auto ______ 1.820 ______ auto _______ 1.315
392 ______ auto ______ 1.820 ______ auto _______ 1.424 (x8 multiplier)
Hardware Canucks readings for E6400 (65nm)
400 ______ auto ______ 1.83v ______ auto _______ 1.43v
400 ______ 1.5v ______ 1.83v ______ 1.2v _______ 1.43v
400 ______ 1.54v _____ 1.58v ______ 1.24v ______ 1.26v
Asus told me that vcore would affect auto voltages too so I choose just 2 FSBs & then altered the vcore.
372 MHz FSB
vcore setting _ CPU PLL setting _ actual _ FSB Term. setting _ actual
1.4v ________ auto & 1.5v ____ 1.82 ________ auto & 1.2 __ 1.315
1.39375v ____ auto __________ 1.82 ________ auto _______ 1.315
I had to drop the multiplier & FSB so I was sure my CPU would boot (does not effect auto voltages at these speeds, see above).
342 MHz FSB (x8 multiplier)
1.35v _______ auto __________ 1.82 ________ auto _______ 1.315
1.3v ________ auto __________ 1.82 ________ auto _______ 1.315
1.25v _______ auto __________ 1.82 ________ auto _______ 1.315
No change for those 2 settings then, maybe it alters the NBv etc? but I can't easily test those .
So to avoid heavy over-volting of the CPU PLL & FSB Term. set to the 2nd lowest manual setting. Clever Asus! :roll:
I know the vcore is automatically bumped up as FSB speed is increased, I can see that in the bios & CPU-Z etc.
Does the bios do the same thing to the chipset voltages?. Annoyingly the bios does not show actual chipset voltages etc, unlike the ROG version.
[update] All my voltages on manual now.
Anyone know for sure?
TIA
Btw this mbrd is running a Q6600 G0, currently @3.35GHz, 372 MHz FSB.
[update] So far I have found out that not just on auto, but also on the lowest (base) manual setting for the CPU PLL & vFSB that this mbrd heavily over volts these 2 settings above a certain (unknown) FSB.
This article originally linked by n7, shows that at 400MHz FSB the CPU PLL is at 1.83v on the 1.5v setting & the vFSB is at 1.43v on the 1.2v setting!:Q. They latter found out that with a 45nm CPU the vFSB over-volts far less on auto or the lowest setting but it's still worth chosing at least the 2nd lowest manual setting. (Checkout their thread related to the article for numbers).
My rig is at 372MHz FSB & I found (using a Digital Multi Meter & measuring points from the linked article above) that the CPU PLL was at 1.81v for the 1.5v setting! & the vFSB was at 1.31v for the 1.2v setting, not as bad but still significant.
Setting the CPU PLL voltage to 1.52v brought it inline to 1.54v.
For my Q6600 G0 (65nm), vcore setting 1.40625v
At all the tested FSB speeds I noted the following :-
CPU PLL 1.52v setting = 1.545v
vFSB Term. 1.22v setting = 1.229v.
At 362,372 & 392 FSB CPU PLL & vFSB Term at base manual settings of 1.5v & 1.2v was exactly the same as auto (& probably is for all FSB speeds).
'Actual' voltages are measured using my digital multi meter.
FSB _ CPU PLL setting _ actual _ FSB Term. setting _ actual
333 ______ auto ______ 1.722 ______ auto _______ 1.315
342 ______ auto ______ 1.820 ______ auto _______ 1.315
352 ______ auto ______ 1.820 ______ auto _______ 1.315
362 ______ auto ______ 1.820 ______ auto _______ 1.315
372 ______ auto ______ 1.820 ______ auto _______ 1.315
382 ______ auto ______ 1.820 ______ auto _______ 1.315
392 ______ auto ______ 1.820 ______ auto _______ 1.424 (x8 multiplier)
Hardware Canucks readings for E6400 (65nm)
400 ______ auto ______ 1.83v ______ auto _______ 1.43v
400 ______ 1.5v ______ 1.83v ______ 1.2v _______ 1.43v
400 ______ 1.54v _____ 1.58v ______ 1.24v ______ 1.26v
Asus told me that vcore would affect auto voltages too so I choose just 2 FSBs & then altered the vcore.
372 MHz FSB
vcore setting _ CPU PLL setting _ actual _ FSB Term. setting _ actual
1.4v ________ auto & 1.5v ____ 1.82 ________ auto & 1.2 __ 1.315
1.39375v ____ auto __________ 1.82 ________ auto _______ 1.315
I had to drop the multiplier & FSB so I was sure my CPU would boot (does not effect auto voltages at these speeds, see above).
342 MHz FSB (x8 multiplier)
1.35v _______ auto __________ 1.82 ________ auto _______ 1.315
1.3v ________ auto __________ 1.82 ________ auto _______ 1.315
1.25v _______ auto __________ 1.82 ________ auto _______ 1.315
No change for those 2 settings then, maybe it alters the NBv etc? but I can't easily test those .
So to avoid heavy over-volting of the CPU PLL & FSB Term. set to the 2nd lowest manual setting. Clever Asus! :roll: