Lenovo - DDR2 - 512 MB - FB-DIMM 240-pin - 667 MHz / PC2-5300 - CL5 - Fuldt bufferet - ECC - for IntelliStation Z Pro 9228; BladeCenter HS21; HS21 XM; System x3400; x3500; x3550; x3650

Why do I find that the same product is available on different item numbers?

Manufacturers often release the same product with different item numbers, typically just different versions of the packaging. For example, the packaging may be targeted at different countries. We try our best to unify the products, but it can happen that the same product appears on different item numbers in our system.