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
Answer
only DDR3 800/1066 are compatible
This is incorrect, it should read "memory supporting at least 400MHz or 533MHz".
(DDR3-800 runs at 400MHz with two actions per cycle. Marketing loves to present that as 800MHz. Which is about the same as saying "I have a car which drives 50kmph with two people in it, so it is a 100kmph car"...)
Staying with the car analogies, you are perfectly fine running a car capable to 160kmph on a highway at 120kmph speeds. It does not matter that it can go faster, but it must at least be able to drive 120kmph. Same with your memory. Yours DDR3-1600 can do 800MHz (DDR-1600), 533MHz (DDR-1333) or 400MHz (DDR3-800).
The only thing which you really want o pay attention to is the difference between DDR3 and DDR3L. Normal DDR3 operates at 1.5volt. It may or may nor work at other voltages. DDR3-L operates at 1.35v (and likely also works at 1.5v or 1.65v). You do not want to do this the wrong way around (e.g. a DDR3L only system with regular DDR3).
The last should not bother you today, but it is something to keep in your mind when you upgrade. Modern systems (and thus upgrades) usually use DDR4 or DDR3-L.
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