MB not running cpu at normal system bus speed.....

[brother cannon]

My problem is that I have a mb that lets you change the system bus speed and when I use my slot a thunder bird in it I can only us it at the lowest setting (90mhz) instead of the default (100mhz). Thus my 800 t-bird is running at only 720 instead of 800. I have put a 550 athlon classic on the mb and I it works a 100mhz system bus speed. I don't want to over clock anything. I paid for a 800mhz cpu and I want to use it at 800mhz.

What I have done to try to fix it.

Update bios,
switch settings in bios,
try all the setting on the dip switches on the board. It will run unstable with the system bus running at 95mhz, any higher and the system will not boot.

Thinking of trying,
Using first version of bios. The manual says that there is an option to set the cpu thermal slow ratio in the bios but it is not availble in the versions that I have tried. Might solve problem.

wondering if I need a more powerful power supply. I only have a 250 watt ps, and amd reccomends 300 watts.

the specs,

550mhz slot a athlon classic works at 100mhz
800mhz slot a T-bird, only works at 90 mhz
Gigabyte ga-7ixe mb
250 watt deer power supply
12.6 ibm hdd
floppy drive
pioneer 16x dvd
iomega 8x4x32x cd-rw
Herculees 3d prophet 4000
256 ram, 128 is micron, other 128?
diamond modem
linksys nic
fire wire card

[Bovon]

I am not a slot cpu user, and do not know the specs, but are you certain you have the core voltage set properly?.

If Vcore is too low, it would probably do exactly what you are stating it does.

The possibility of the power supply being to little may be part of your problem if Vcore is low. Try upping Vcore a tad and see if it will boot.

[brother cannon]

I checked the v core an it is at 1.7 volts. I couldn't find any way in my bios to change it. Any suggestions other than getting a 300 watt power supply?

[Bovon]

Well, I couldn't believe there wouldn't be some way to set Vcore to something else, so I downloaded the manual...and you are right, I do not see any jumpers or bios configuration to change it.

The only reference I saw was on the bios page 'PC Health Status' where it shows some Vcore voltage in red, I don't presume you can change that can you?...thats probably just a reporting screen, but I can't tell from the pictures in the pdf manual.

Tell you what. Disconnect everything from your power supply that you can. Leave the hard drive, motherboard and cpu fan on, and disable any cd rom drive, and any other drives, pull all other cards out of the pc. In other words, reduce the power consumption as much as possible and then see if it will work. That could tell you if you are low on power or not.

Other than this, you will have to hope somebody comes along that has this board and has first hand experence with it. You could try writing Gigibyte and ask them about your problems. I have read where others have had some problems that went away with a better power supply, but maybe you can prove thats your trouble before you go out and buy one.

[brother cannon]

In the bios you can see what the v core is running at but you can not change it. I have already wrote Giga-Byte but I fear it will take some for them to get back to me if at all. I'll try unplugging all the non-essential and see if that works. Thanks for the ideas, and I'll keep you posted.

And next time I'll use a asus board.