NOTE: This is a copy of a post I put in the Mobo forum, but it applies to this forum as well, so I hope to find someone who has done this exact thing. Being new, I hope it does not violate any rule to post in two forums.
My A7M266 will OC using the FSB alone to about 143 completely stable, but becomes unstable around 144-145 (strange errors and benchmarks like 3DMark 2001 will lock up during the merry go round scene, but SiSoft Sandra tests run flawlessly) and won't load windows at 147-148. I am using Corsair PC2400, and have excellent cooling (CPU temps 45 idle and 50 load when OCd). I read many posts of folks who have increased the core voltage of the CPU to OC better, but if I move the VID (core voltage)jumpers from default (shown below), the machine won't boot or even post. My bios is 1003, 4-in-1 drivers are 4.24, and I have my mobo jumpers in the following positions:
JEN 2-3 (jumper free)
DSCKF all off (frequency selection dip switches) for jumper free
VID1-4 all in the 3-4 position as required by the manual for jumper free
VIO 3-4 (3.45 volts)
VIO1 1-2 (2.7 volts) I have also read on Mushkin's website
(I think) that they recommend removal of VIO1 jumper to make the voltage be 2.5, as they recommen, but others claim removing the jumper gets you 2.8?? In the 2.8 position, I get errors and program lockups.
Without changing any other jumpers, I tried moving the VID1-4 jumpers to 1.8/1.775 settings, from top to bottom:
VID4 1-2 VID3 1-2 VID2 1-2 VID1 2-3 (VID1 should be the one nearest to the lower edge of the board?)
but the machine will not even post. Moving them back to the default sets things back to normal. How are you OC folks changing voltage without disabling the jumper free options in bios? Is my bios 1003 restricted in some way? Has anyone been able to increase core voltage using bios 1003 like mine? Am I doing something else wrong?
If I move JEN to jumper mode, then all bios adjustments are disabled, and while I could theoretically (I haven't tried it) increase vcore voltage, my FSB would be limited to 133, the max allowed by the dip switches in jumper mode.
In the default mode, Sandra Reports the CPU voltage as 1.75.
The Athlon is an AXIA Y 1333
My power supply is a 400 watt sparkle
Running Win98
At 142FSB and the VisionTek GEForce 2 Ultra OCd to 275/500, my 3DMark2001 score is 4690, so everything seems OK.
The mobo is fast and stable, I just love to OC and tinker. As I have to leave town for a few days, I hope I supplied enough info for your appreciated replies (which I will read in about a week). Thanks
PS, I could, but don't want to, modify the board, so please limit advice to apply to an unmodified board
My A7M266 will OC using the FSB alone to about 143 completely stable, but becomes unstable around 144-145 (strange errors and benchmarks like 3DMark 2001 will lock up during the merry go round scene, but SiSoft Sandra tests run flawlessly) and won't load windows at 147-148. I am using Corsair PC2400, and have excellent cooling (CPU temps 45 idle and 50 load when OCd). I read many posts of folks who have increased the core voltage of the CPU to OC better, but if I move the VID (core voltage)jumpers from default (shown below), the machine won't boot or even post. My bios is 1003, 4-in-1 drivers are 4.24, and I have my mobo jumpers in the following positions:
JEN 2-3 (jumper free)
DSCKF all off (frequency selection dip switches) for jumper free
VID1-4 all in the 3-4 position as required by the manual for jumper free
VIO 3-4 (3.45 volts)
VIO1 1-2 (2.7 volts) I have also read on Mushkin's website
(I think) that they recommend removal of VIO1 jumper to make the voltage be 2.5, as they recommen, but others claim removing the jumper gets you 2.8?? In the 2.8 position, I get errors and program lockups.
Without changing any other jumpers, I tried moving the VID1-4 jumpers to 1.8/1.775 settings, from top to bottom:
VID4 1-2 VID3 1-2 VID2 1-2 VID1 2-3 (VID1 should be the one nearest to the lower edge of the board?)
but the machine will not even post. Moving them back to the default sets things back to normal. How are you OC folks changing voltage without disabling the jumper free options in bios? Is my bios 1003 restricted in some way? Has anyone been able to increase core voltage using bios 1003 like mine? Am I doing something else wrong?
If I move JEN to jumper mode, then all bios adjustments are disabled, and while I could theoretically (I haven't tried it) increase vcore voltage, my FSB would be limited to 133, the max allowed by the dip switches in jumper mode.
In the default mode, Sandra Reports the CPU voltage as 1.75.
The Athlon is an AXIA Y 1333
My power supply is a 400 watt sparkle
Running Win98
At 142FSB and the VisionTek GEForce 2 Ultra OCd to 275/500, my 3DMark2001 score is 4690, so everything seems OK.
The mobo is fast and stable, I just love to OC and tinker. As I have to leave town for a few days, I hope I supplied enough info for your appreciated replies (which I will read in about a week). Thanks
PS, I could, but don't want to, modify the board, so please limit advice to apply to an unmodified board
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