Actually I may be still running the stock Bios as well. It may have been my AMD MSI board I upgraded the Bios on. Anyways it works great with PC2100 ram the way it is, so for me I am going to leave it alone. Wit hthe price of ram skyrocketing and me sitting here with a bunch of PC2100 I will leave well enough alone. I wish I could get my Asus P4B533 to run PC2100 at those speeds though.