GeForce 2 GTS

I have a problem with VIA chipset (693A ,686A).
Problem is with graphic performance or card. I use different graphic cards (AGP 2x, AGP 4x) , but no difference. Problem is , when i play like Unreal, the hard drive is active constantly , and the game is like a slide show.
Under windows 98SE ,the game is hmm good slide show . Under Win 2K , you can play game normali to resolution of 800x600 , but is not smoothly.
I upgrade BIOS , I downlowed the newest driver from VIA`s , and so on.

Hardware configuration is :
PIII 500MHZ
256MB PC133 RAM
Geforce 2 Grafic card
3Com network card
...

I`m probably overlook something , or is just VIA ?



[This message has been edited by Borut_P (edited June 28, 2000).]