An Apple equivalent 4GB Unbuffered ECC DIMM (PC3-10600) from Hypertec.
Hypertec 4GB PC2-3200 (Legacy) memory module 1 x 4 GB DDR2 400 MHz
Hypertec 4GB PC3-10600 memory module 1 x 4 GB DDR3 1333 MHz
Hypertec 4GB Kit PC2-5300 (Legacy) memory module 2 x 2 GB DDR2 667 MHz
Hypertec 4GB PC3-12800 memory module 1 x 4 GB DDR3 1600 MHz
Hypertec 4GB KIT REG DDR2 (PC2-4200) (Legacy) memory module 2 x 2 GB 5
