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how to change Vcore
Name: rb6sn Date: April 19, 2003 at 22:37:34 Pacific OS: XP CPU/Ram: 2.66 512 ddr 333
Comment:
I am using a shuttle ab48 motherboard when i try to overclock it becomes very unstable.. i thought it would help if i change the vcore setting. the vcore settings in my bios do not let me adjust them. they are set to 1.50v. am i looking at the wrong place or does my motherboard just not allow it?
Name: johnoh Date: April 20, 2003 at 02:28:50 Pacific
Reply:
A wild guess is that half the motherboards made and 5% of the motherboards in use allow vcore adjustment. Yours does not. There is probably a hardware mod procedure that will allow it, but hardware mods are on the out being so much more trouble than they're worth.
Here is how you adjust the vcore via a hardware mod to a Shuttle AK31. If you hunt around you might find one for the ab48.
http://www.vr-zone.com/guides/Shuttle/AK3x/
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Response Number 2
Name: rb6sn Date: April 20, 2003 at 13:40:27 Pacific
Reply:
so i wouldnt be able to overclock much with this motherboard because i cant change the vcore?
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Response Number 3
Name: johnoh Date: April 20, 2003 at 14:39:32 Pacific
Reply:
Well not being able to increase the vcore might hold you back, but at this point you don't really know what will be the weak link. Your motherboard may be unstable before vcore would have helped, or the memory (if the board does not allow memory speed to be independant of fsb speed) may hold you back.
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Response Number 4
Name: rb6sn Date: April 20, 2003 at 14:51:05 Pacific
Reply:
in my bios im only get 1.48 for the vcore... when i overclock my p4 2.66 to 2.90 my prime95 gets errors. is there any other way to fix this besides changing the vcore?
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Response Number 5
Name: rb6sn Date: April 20, 2003 at 15:05:59 Pacific
Reply:
and is there any way to change the vcore using software?
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Response Number 6
Name: johnoh Date: April 20, 2003 at 17:51:09 Pacific
Reply:
If your cpu was cooler it would help.
Are you jumping straight from 2.66 to 2.9? The p4 2.66 is not a big overclocker.
vcore is not adjustable through any software I know of other than your bios.
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Response Number 7
Name: rb6sn Date: April 20, 2003 at 18:42:07 Pacific
Reply:
i fail on the 4th test using prime95 running at 2.82ghz. idle temp is 34C.
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Response Number 8
Name: rb6sn Date: April 20, 2003 at 18:53:13 Pacific
Reply:
and no im not going straight from 2.66 to 2.9 im increasing 1mhz fsb at a time. when i get to 141mhz prime95 fails on the 4th test.
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