I have an HP-Pavilion dm4-1150ca. The CPU is a first gen. Intel Core i5 450m.
When I looked at the specifications page of this processor, I saw that it said only DDR3 800/1066 are compatible. However, the RAM that came physically installed with the laptop are (Micron) DDR3 1333MHz.
I used Crucial's advisor tool and it said PCL-12800/DDR3-1600 are compatible. Corsair's SODIMM Vengeance DDR3 claims to be backwards compatible with First gen Intel Core i5 processors. I just bought 2x4GB Corsair Vengeance RAM (which are DDR3L-1600). I am waiting on the arrival of the product for testing. I've read that generally RAM is more or less "plug-n-play". However, how come these manufacturers list contradictory compatibilities?
Is it because, implicitly RAM is compatible with most computers provided the DDR version is correct?
UPDATE: 2x4GB DDR3L 1600MHz SODIMM Corsair Vengeance installed, fully working. However, memory is being clocked-down to 1067MHz. Memory voltage is 1.35V