Used. Untested. No Returns. As is. Worked when pulled many years ago and has been stored in an anti-static bag.The Nanya NT256D64S88AG-7K 256MB DDR-266MHz-CL2 PC2100U-20330 is a single DIMM module of DDR-266MHz memory with a total capacity of 256MB. It features ECC memory, is registered, and fully buffered, making it suitable for reliable and high-performance use in computers. The model number is 0234.K963719, and it is designed to operate at a bus speed of PC-2100 (DDR-266). This memory unit is a dependable choice for enhancing the speed and efficiency of a computer system.