And since DeLL doesn't make RAM? Hynix or Samsung odds are. 533 would be DDR2 and DDR2 is a JEDEC standard. One reason we have JEDEC is we have standards and interchangeability/compatibility. 5 DRAM MFG in the world Samsung is the largest. Many using that DRAM and making PCB's and putting DRAM on to make DIMM's of RAM.