Your system AMD XP 1800 CPU@1.5Ghz(266 DDR fsb unless you are overclocking it) Asus A7A266 Mobo GeForce 4 TI 4400 512 MB PC133 SDRAM 60gb HDD Windows XP Pro 3dmark2001SE : 6039 Geforce 4 Ti 4400 Fill Rate : 4.4 Billion AA Samples/Sec. Operations Per Second : 1.12 Trillion Memory Bandwidth : 8.8GB/Sec. My system AMD Athlon 1.4Ghz@1.5Ghz(286 DDR fsb) Asus A7M266 Mobo Geforce 3 256 MB DDR2100 20GB HDD Windows 98SE 3dmark2001 : 6511 Geforce 3 Fill Rate : 3.2 Billion AA Samples/Sec. Operations Per Second : 800 Billion Memory Bandwidth : 7.36GB/Sec. I have read online and printed articles saying that windows98SE is better for gaming (proven with Benchmarks) but not that much that your score should be dramatically affected. But I would be tempted to stick in some DDR ram to see how that boosts the system performance rather than the old SDR PC133 ram... Also make sure you have installed the motherboard chipset drivers that are needed. Check Asus website for latest ones. I know that for my A7M266 I need the northbridge AMD760 AGP driver installed. Maybe you need the ALi equivalent. You can get the drivers direct from ALi but I would try Asus first. Also the chipset on your motherboard isn't the best DDR one out of the 266 range. The KT266a and nForce ones beat it and so does the AMD760 in a lot of performance benchmarks But yet again I don't think this can be held responsible for your low 3dmark2001SE performance. Actually I am not so sure about DDR making a difference, especially in UT. Check out Tomshardware here, they bench the A7A266 with SDR and DDR so you can see the difference in framerates, but bear in mind that they test it with the Asus V7700 AGP, nVIDIA GeForce2 GTS, 32 MB DDR SDRAM and not a GF4.