Type: Rambus RIMM 184-pin
Capacity: 256MB / 8 ECC
Speed: PC800 - 800 MHz
Part: Infineon HYR1812840G-845
Note: RDRAM runs hot - that's why it has the big black heatsink. You need RDRAM in pairs. The green stick next to it is a "C-RIMM" continuity module, used to fill empty slots.