I was doing some search on XMP RAMs and Motherboards. I wanted to know if i could run a ram faster than the 1866 Mhz that Athlon II x4 840 Supports on an XMP Motherboard with rams that Support more than 1866 mHz?
Using quality modules (none of that ValueRAM garbage and the like) you're limited by your motherboard's supported speed.
getting ram with better timings will be a far greater improvement than higher speed.
Actually with DDR3 the primary gains for the GPU section of an APU is in RAM frequency of ~2133 MHz. Beyond ~2133 MHz. there is little system gains. When moving to DDR3, RAM timings and frequency became far less important for CPUs as DDR3 RAM running at 1600 MHz. is not a system bottleneck like DDR/DDR2 were and thus faster RAM or RAM timings offer no tangible system gains for CPU powered systems. With APUs the bandwidth is a little too narrow so faster RAM up to 2133 MHz helps system performance a bit.
You will not see any tangible system performance gains above ~1866 MHz. DDR3 RAM on single CPU powered AMD desktop systems because DDR3 running at 1600 MHz. is not a system bottleneck. It's always difficult finding tech info. on AMD processors but these CPUs should support ~2133 MHz. RAM if you feel the need to try faster RAM. APU powered systems see a small gain in the GPU section with up to ~2133 MHz. because the graphics bandwidth is a bit too narrow.
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