9500GT beats GT220 like crazy??

[zim2dive]

Doing a system upgrade on another machine, I had a spare GT220 to play with: http://www.newegg.com/Product/Produc...82E16814127455

by most reviews (http://www.videocardbenchmark.net/gpu_list.php), its supposed to be _marginally_ better than the 9500GT (http://www.newegg.com/Product/Produc...82E16814127419) I am currently using. (460 vs 361 on the passmark site) (FWIW, in case anyone wants to use this card, I plugged in the 220 and it came right up.)

But when I ran Xbench, I see (green is the 9500GT, red is the GT220)

Quartz 268.95 -> 191.70
OpenGL 187.51-> 151.08

any ideas why its doing so badly compared to the 9500?