Hello everybody, I'm back with the same problem . Sure I'm using the latest nVIDIA drivers on a clean Win98SE instal with Unoficial SP 2.1 still when I benchmark in WinXP (SP1 or 2 it doesn't matter) I get a score around 8 minutes for calculatin SuperPI 8M while in Win98SE I get around 13 minutes . That's a huge 62% slower in Win98SE . Why ? It can't be the drivers , I'm using the latest ones . It can't be a patch that I've forgot to apply , I'm using Unoficial SP2.1 . I'm sure it's about a specific procesor driver as only WinXP comes with K7.sys and K6.sys and Win98SE doesn't but the problem is no more if an Intel CPU is involved. Yes, I've benchmarked a system with a Celeron 3 (a Coppermine derived Celeron) in Win98SE and WinXP and the results are quite close . Why ? Because there is a Pentium driver in Win98 . Also , I was benchmarking on a KT266A before and I using an Abit NF7-S 2.0 now . So it can't be a particularity of the chipset or mainboard.