Up for sale is an NCR DDR2-667MHz (PC2-5300) non-ECC, unbuffered 200-pin SO-DIMM. This module is single sided, single rank. The chips are made by Micron.Module part number is AVK6464U60E6800F1-AP.This same module is also sold by Avant Tech, although the label says NCR. They are the same module.This module was purchased to add memory to a laser printer that was extremely picky about memory modules. This module, like 10 others tried, was not compatible. Only one module was. So it was only used to boot the printer to check whether the correct amount of memory was installed.If you are looking at this, you probably have a similar picky device that needs this specific module, in which case I sympathize.Satisfaction guaranteed. Check my response history.Absolutely no returns will be accepted.