These were removed from a working computer and work like new. This is premium memory (see Newegg review below).
Brand: OCZ Technology
Memory Size: 1 GB x 4 modules
Memory Technology: DDR2 SDRAM
Memory Speed: 800 MHz
Number of Pins: 240
The new OCZ PC2-6400 Gold Edition was developed with gamers in mind. The latest PC games require large capacity, lightning fast memory to deliver the most powerful performance. The PC2-6400 Gold Edition is the ultimate memory solution for contemporary graphic-intensive PC titles and provides 800MHz clock speeds, unsurpassed reliability and performance to unleash every graphic possibility. The higher the data transfer rate, the faster you get on the field! This 240-Pin DDR2 SDRAM system memory facilitates lightning-fast data transfers, optimum resource management and smooth multi-tasking.
This module utilizes the latest OCZ XTC (Xtreme Thermal Convection) heatspreader design. This allows increased ventilation and heat dissipation due to an innovative honeycomb design more open to the actual memory ICs. OCZ also offers the unique Extended Voltage Protection feature, which allows the memory modules to handle voltages up to 2.2V ±5%. This memory is a great upgrade for your lethal gaming system or graphics giant.