🇵🇱 DDR3 1RX8 RAM 8GB dell optiplex

2 sticks of ddr3 ram IT DOESNT WORK ON ALL DDR3 SYSTEMS, i dont know any specifics, i think its some kind of newer version of ddr3 that only works on newer ddr3 computers. it worked when tested on a mini dell optiplex PC but didnt on a diffrent model optiplex because it didnt support it. i wont take refunds if it ends up not working on yours 🇵🇱 shipping from poland