How do you tell if a particular RAM is compatible with your build?

[MikeHunt]

I recently found out that some RAM wont be compatible with a mobo. I know about DDR3, 2, etc. but is that the only aspect that determines compatibility?

[Guest]

ECC

[EcoBoost]

I recently found out that some RAM wont be compatible with a mobo. I know about DDR3, 2, etc. but is that the only aspect that determines compatibility?

If it works it works. Things like speed and timings are automatically adjusted by modern mobos to work optimally. 

[wng_kingsley7]

I recently found out that some RAM wont be compatible with a mobo. I know about DDR3, 2, etc. but is that the only aspect that determines compatibility?

Physical attributes is a key factor...somewhat. Price can be associated & determining how can you fully utilize it.

[Peter Vaughan Truslow]

in the desktop market, the differentiating factors are type:DDR-3 vs DDR-4 etc, 95% of desktops use Dimms, where laptops and *some* small motherboards use SO-DIMMS

ECC, Buffered , Registered etc are important for servers and high end workstations

[Sauron]

Some motherboards don't officially support certain ram frequencies. Also, for obvious reason a 4-dimm kit won't fully fit in a 2-slot motherboard. There are also "mobile-grade" so-dimms which are different in shape and won't fit on motherboards designed for normal dimms. Memory can also be ECC and not all motherboards support that. In short, find out what your motherboard supports from the manufacturer's website and buy something that fits the description.