From what I have been reading the 41.03 drivers arn't the greatest, I think thats why Nvidia has held off putting them directly on their site.
I have read that alot of people just went back to the 40.72 ones, like me =+]
I also have a soyo kt333 plat and a xp2400 (which 3dmark doesn't recognize correctly so does HORRIBLE scores) but with my 1800 (oc'd to 2000) and my GF4 ti 4600 I had 11535 with 512 pc 2700 so you should probably have 8500+ score at least (as was previously mentioned)
Barak