which side does it go in? top or bottom?

Questions & Answers: CMS 4GB (1X4GB) DDR3 8500 1066MHZ NON ECC SODIMM Memory Ram Upgrade Compatible with HP/Compaq® Probook 6440B, 6450B, 6540B (Ddr3) - A34

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CMS 4GB (1X4GB) DDR3 8500 1066MHZ NON ECC SODIMM Memory Ram Upgrade Compatible with HP/Compaq® Probook 6440B, 6450B, 6540B (Ddr3) - A34

Computer Memory Solutions guarantees compatibility with models provided in description.
Memory Type: SODIMM, 204-Pin
Speed: DDR3-8500, 1066 MHz
1 Piece Kit
Product appearance may vary. Picture for reference only. limited lifetime warranty when bought directly from computer memory solutions