considering you got a socket 754 sempron 2800 its most likely agp , but theres nothing wrong with making sure download everest http://www.majorgeeks.com/download4181.html get into motherboard-->motherboard and look in "expansion slots" field down
hah a comedian i see. . ok, so i opened my case, and saw the offset brown slot, so i guess its agp for me. . also aliasaid, how much did u pay for that value ram?