RAM & Memory Upgrades
6GB (4GB + 2GB) DDR2 667MHz PC2-5300 200-PIN SODIMM MEMORY KIT COMPATIBLE WITH MACBOOK (LATE 2007 - EARLY/LATE 2008 - EARLY 2009) & MACBOOK PRO (MID/LATE 2007 - EARLY 2008)
SIZE/CAPACITY: 6GB KIT (4GB + 2GB) VOLTAGE/POWER CONSUMPTION: 1.8v CAS LATENCY: CL6 SPEED: PC2-5300 (667MHz) TYPE/INTERFACE: 200-PIN DDR2 SODIMM 200-PIN MACBOOK & MACBOOK PRO DDR2 SODIMM
https://www.bizrate.co.uk/ram_memoryupgrades/6gb-4gb-2gb-ddr2-667mhz-oid4507779273.html