RAM will not improve game play unless the game itself uses that RAM. Almost all games run on a 32x architecture meaning the max RAM that game will use is 4Gb.
Popular games like CSGO, Battlefield 3 and Blockland all use 32x and can't use more than 4Gb of RAM. The list of games that request more RAM is so short, it still uses less if you manage your settings
Below is a list of all games (As of 2015) that COULD use more than 4 Gb of RAM
Battlefield 4
Call of Duty: Ghosts
Call of Duty: Advanced Warfare
Dead Rising 3
FIFA 15
Galactic Civilation 3
Landmark
Middle-earth: Shadow of Mordor
NBA 2K15
Ryse: Son of Rome
StarCitizen
TitanFall
Watch Dogs
Wolfenstein: The New Order
Speed of RAM is pointless, DO NOT waste your money on more expensive RAM UNLESS you are overclocking "Just for the numbers" (Google extreme over clockers competition, those are the people who benefit from it). Heres a great example and a test showing the difference between 1333Mhz and 2400Mhz
https://www.youtube.com/watch?v=dWgzA2C61z4 (2:15 if you just wana see a chart difference)
What you need to look for is compatibility across all your devices and your good. Don't go buying a 2400Mhz RAM if your MoBo can only support 1600Mhz and below.
for component speeds in gaming, gpu > cpu > ram
and extreme multi-tasking, cpu(more cores helps) > ram > gpu(depends on the programs, really)
100% Correct, so if you feel a bottleneck, start with GPU, then CPU, and finally RAM and even then if you have a CPU thats 3 years old its still gonna be powerful enough. I have a 2600k and that CPU is the last thing that requires upgrading.
P.S. - Everyone here talking about RAM speed, CAS, and what not have no clue what they are talking about.