HP/Compaq Pavilion 500 Series Desktop Memory Upgrade Configurator - choose your Model:

500a/500d/510a/510d
500s/510t/510x/520s/520w
501a/510k/510m/521a
501d
501n
502n
503a/503n/503w
503g
503k
503x
504a
504d
504k
504n
505n
505w
506x
510c/510n/510w/511n/511w
511k
511t
512a
512c
512d
512m/512t/512w/512x
512n
513a/513d
513c
513g
513n/513w
513x
514a
514c
514m
514n
514t
514x
515n
515x
520c/550n
520k
520n
521c/521n
521d/521k
522a
522c
522n
523a
523n
523w/533c
524c
524g
524w
525c-b
525w
526x/526x-b
530k/530t/540n
531w
532n
532w/533a
533w
541c
542x
543x
544a/534a
544n
545x-b
551w/560w
552w/552x
553w
553x
554e (CTO)
554x-b
554y (CTO)
555e (CTO)
563w
564a
564w
573 (CTO)
576x-b