Are u trying to change the multiplier or just increasing the FSB?
Try this because I have a 900 Tbird @ 1 gig.
1 Connect L1bridges
2 Max Voltage
3 Set FSB 100 Multiplier x 9.5 (make sure to download the jumper setting from asus.com)
4 If success then keep upping the Multiplier till u hit the limit (x 10 was all mine will take 🙁 )
5 Once u find the limit start uping the FSB (105 will probably be max)
6 U can try different combos like 100FSB x 10 or 105 X 9.5 both = 1 gig
I kept my FSB at 100 for maximum stability but every system is a little different.
And remember your 900 might be a dud or hit over 1 gig.
I all most forgot, Use 1005c Bios and use AFLASH.EXE not AsusUpdate .
Good luck