34 & 35 & 36 & 37. PC mark 2004 is the next version to be tested and it includes a few GPU tests:

The scores of both processors are really close - only 4% apart - within the margin of error. Athlon XP memory score is better by 9%, so the extra cache helps here; however the graphics score of the Duron is 6% higher than the Athlon and that is repeatable! Something is really fishy here, let's see if the next version of PC mark has something to show us!

38 & 39 & 40 & 41. The final version of PC mark compatible with Windows XP is the 2005 one.

Things are looking really odd! Athlon XP manages an 8% better CPU score which is significant; however the real highlight is the memory: Thoroughbred is 58% better than Duron - a colossal advantage!
Again Duron scores far better in the graphics department: 15% better than Thoroughbred! I repeated the test on both CPU's many times and Thoroughbred graphics score is always worse and memory score is always far better!