Max speed of four RAM modules in GA 790FXTA-UD5?

[thx1138]

If I want to employ all four RAM slots in the GA 790FXTA-UD5, am I correct in my understanding that I am limited to 1333 Mhz, while if I elect to use only two slots, I can attain 1866 Mhz with suitable modules? Supposing that I purchase two 2 GB 1866 Mhz modules, and wanted to add a further two in the future. Would it then be possible to add two 1333 Mhz modules or would they also need to be 1866 Mhz?

[nicolatesla]

If I want to employ all four RAM slots in the GA 790FXTA-UD5, am I correct in my understanding that I am limited to 1333 Mhz, while if I elect to use only two slots, I can attain 1866 Mhz with suitable modules? Supposing that I purchase two 2 GB 1866 Mhz modules, and wanted to add a further two in the future. Would it then be possible to add two 1333 Mhz modules or would they also need to be 1866 Mhz?

Depends on the operating system, you need 64 bit to run 8 gigs of memory in 4 slots, and you can crank the memory clock as high as you please; although going over 1100 Mhz does tend to produce quite a bit of heat. And yes the modules should be matched, but check the "approved memory" list, highly recommended it is.