I have an Athlon II 630 processor running with some DDR3 1600 memory. I've read numerous postings around the net alluding to the fact that AMD Athlon II CPU's cannot run with DDR3 memory over 1333, and that the board will automatically underclock the memory if it is set any higher. Is this accurate, is there no reason to set the memory to anything above 1333 for Athlon IIs.
Don't confuse Memory Controller speed with Memory speed; it doesn't take into account multipliers. i7 has a 1066 MHz but the Memory speed is a multiplier of BCLK X Memory Multiplier; others use FSB multiplier but the principle is essentially the same; similar to CPU multipliers - imagine a CPU with (1); 1 X BCLK will be pretty slow.
"the max memory speed is from the memory controller which right now for both Intel and AMD is inside the cpu, and i would imagine that loneninja is probably right about why
though from what it seems most of these memory controllers are fine and can run at much higher speeds than they are rated, thoguh it is possible to get one that can only run at the advertised speed "
"Ram speed has nothing to do with CPU speed at all. Both can be under/overclocked independently. For example with Intel systems, both have their own multipliers, linking them to one general clock, namely the FSB for older systems or the Baseclock for i-x systems.
To conclude, you can run any ram on any cpu, however you'll have to make sure your mobo supports both speed and type of ram. To do that, read reviews. You won't have to OC the CPU to be able to clock the ram at higher speed, unless there's some kind of technical limit, like not having a high enough ram MP, to get the desired ram speed at the current general clock, however that's not likely. Even then you can still up the general clock and lower the cpu mp to keep it at the same speed."
That answers my question, thanks for all the info.