untrue about you're assumed RAM speed requirements for FX 8 series CPUs, you can run it on DDR2 even. any GPU will work, even nVidia, currently i have FX-8320 and i had at first used it on DDR3-1600 but now use it on DDR3-2133, the only difference you may notice will be in features with GPU's, if you use an AMD GPU you will get the option for AMD Optimized Tesselation, and the ability to do HPC. No you will not gain insane abilities by mixing an nVidia with an AMD like a PhysX Drive, nVidia has thoroughly prevented that from happening at all anymore. But you will notice significant performance gains using AMD products for AMD designed games, and same goes for nVidia with PhysX enabled games. You should not worry the choice of RAM, there are plenty to select, Kingston is a good brand, but i use AMD Radeon Memory, Corsair is another good choice, but i found the Vengence RAM to be too tall for my CPU Cooler at the time i used the CoolerMaster Hyper 212 Plus great cooler, but wide, hung over the first DIMM slot which is why i switched to the AMD Radeon Memory, it is low profile.
Summary:
-No, there is no required RAM speed for the FX series CPU's but they do offer a much higher DDR3 clock speed than the AM3 Phenom II CPU's
-No, there is no required GPU clock requirement for the FX series GPU, and your game will only be held back by your GPU speed so a super high end CPU is not necessary unless you intend on doing Adobe Premier Pro video editing.
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