Can I get 3.3v I/O Voltage on my P5A-B somehow??

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punkrawker82
Senior K6'er
Posts: 113
Joined: Tue Jul 29, 2003 9:06 pm

Can I get 3.3v I/O Voltage on my P5A-B somehow??

Post by punkrawker82 »

Does anyone know of a program that can change your Mobo's I/O Voltage?? My P5A-B has a minimum I/O Voltage of 3.5v, and I want to get it down to 3.3v. I'm thinking that changing the voltage with software is probably impossible because I haven't been able to find any programs that do that. Are there any undocumented settings for 3.3v or lower with the P5A-B that aren't in the manual??

I believe I have
--------------------
P5A-B rev 1.05 Mobo
AMD K6-2/500/cxt CPU rated at 2.2v Vcore and 3.3v I/O Voltage

I just want to get my Mobo's I/O Voltage down to 3.3v so it matches my CPU and I can run my CPU at 5.0x100(500) rather than 5.0x95(475). It has booted and ran at 500, but it is VERY UNSTABLE AND HOT...

So if anyone knows of a program or jumper setting please let me know...
Past System
----------
Asus P5A-B rev1.05(Beta BIOS 1011.005)
AMD K6-2/CXT AFX @ 500Mhz(CPUCool 5 x 100)
128Mb PC100 SDRAM
VisionTek GeForce 4 MX 440 4x AGP @2x w/ 64Mb DDR
Creative Ensoniq PCI Sound Card
ADS Turbo Quad 4 Port USB PCI Card
Linksys NC100 v2 NIC
Western Digital 8Mb Cache SE 80Gb HD
Lite-On 52x32x52 CDR/RW
Lite-On 16x48 DVD

Current
----------
Athlon XP-A(Barton) 2600+ @ 1.91Ghz
Abit NF7-S v2.0
512Mb Kingston 3200 DDR(2.5-3-3-7)
VisionTek GeForce 4 MX 440 4x AGP w/ 64Mb DDR
fireburns
Junior K6'er
Posts: 45
Joined: Fri Jul 06, 2001 7:57 am

Jumper settings...

Post by fireburns »

punkrawker82,

To the best of my knowledge, you can't set voltage on the fly with that particular chip/board.

However, I believe you may be looking at the wrong set of jumpers. Looking at your manual, I see the following:

VIO Jumpers (VIO0 and VIO1) - deals with DRAM, Chipset and AGP voltage. Should be left at default of Shorting pins 1-2 of VIO1

FSB Jumpers (FS0, FS1, FS2, FS3) - Deal with CPU, AGP and PCI FSB. Unless you plan on overclocking the chip, you want the system to run at 100, 66.6 and 33.3 respectively. That means:

FS0 - short 1-2
FS1 - short 1-2
FS2 - short 1-2
FS3 - short 2-3

Multiplier jumpers (BF0, BF1, BF2) - Deal with CPU multiplier. Again, unless you're planning on overclocking, set at 5 to reach 500 MHz (100 FSB x 5.0 multiplier = 500 MHz)

BF0 - short 1-2
BF1 - short 2-3
BF2 - short 2-3

Voltage Jumpers (VID0, VID1, VID2, VID3) - These are the actual voltage settings for your CPU. You're using a split (dual) voltage CPU with a 2.2v core. Hence:

VID0 - short 1-2
VID1 - short 2-3
VID2 - short 1-2
VID3 - short 1-2

If you're still having heat problems after that, check the seating of your heatsink.

Hope that helps,

-fire
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