I'm trying to run another app on my shop 'puter...

Its an HP D530 P4 with 512 memory. Lots more specs he
http://h18000.www1.hp.com/products/q.../11632_na.html

When it boots it says DDR 266 and runs up to 512 on the memory test. I
pulled the stick and all it says is DDR 266, no other labels.

On New Egg, this is the closest I can find:
http://www.newegg.com/Product/Produc...20266%20pc2700

Will this work? Do different size sticks work together?

Karl