4GB Kit 2GBx2 DDR2-667mhz MacBook Pro Late 2007 and Early 2008
The 4GB Kit contains (2) 2GB DDR2-667, PC2-5300, Latency 5-5-5, Non-ECC, Unbuffered, 1.8V, 200pin SO-DIMM.
MacBook Pro Mid/Late 2007 and Early 2008
The "Original" MacBook Pro has a silver bezel around the screen, and runs DDR2-667 memory. The maximum memory that can be installed is 6GB (1x2GB and 1x4GB.)
Non-Stacked IC's: Eagle Memory uses a Non-stacked module for the 4GB DDR2-667 module for the MacBook Pro. The cheaper stacked IC variety of 4GB SO-DIMM draws more power, which increases heat and decreases battery life. Eagle Memory ONLY uses premium non-stacked chips.