Voodoo2 picture trouble

[Mawe]

Hello,
When playing Colin Mcrae or any other game I get a strange picture on my monitor. This happens after booting from scratch after about 5 to 15minutes. The colors are wrong and/or parts of/all of the picture look like 2D-blocks.
But when I close the game and restart it, it works perfect for hours. This is with atleast 4-5 different games.
Do I have a driver problem? Heat? Conflicting video cards?
Are downloading new drivers for my card.
Regards

Magnus

System spec
k6-2 300 not o/c
Soyo 5ehm BAT mobo
64mb EDO 72 pin
Seagate medalist
SB16 pnp
Adaptec 2940 UW
Nec scsi cd
Noname Minitower
Orchid Righteous 12mb. V2
Diamond Fire GL1000 Pro Pci 8mb.

[This message has been edited by Mawe (edited 02-11-99).]

[Maverick]

try downloading the latest drivers from 3dfx.com
and set your clock rate to 90MHz
this should work usually...

[Mawe]

Update:
New drivers made the graphics faster but it still crash my picture.
How do I adjust the clockrate?

Magnus