Originally Posted by pash1k
I wanted to get the 996679 kit, but newegg ran out minutes before I placed my order -_- (and amazon ran out while I had it in my shopping cart, but on the phone) so I ended up getting the 996744 kit. Really excited to try out Mushkin, making this purchase because of Mushkin's PR (aka this topic). I am not too familiar with RAM timings, but I've heard that AMD CPUs can't go below 8-8-7 at 1600MHz. Is that true? Can you show me a good place to learn about RAM timings and speed? What's more important, low timings or high frequency? Thanks.
Well that's not entirely correct that AM3 can't go below CL8 at 1600, let me explain.
6-8 months ago most AMD boards were tuned for high voltage DDR3, a lot of the boards would not POST with 1.65V type ram if you set CL6 or CL7 on the 1600(1:4) memory multi, only CL8 would work. You could however set CL6 and CL7 if you used the 1333(1:3.33) memory multi.
With the increased interest in AMD, since AMD released the X6 CPUs, most of the BIOS issues with 1.65V type memory have been work out now on the higher end and newer boards.
I have a 790 mobo that 6 months ago I could not use the 1:4 memory multi at anything less than CL8 with 1.65V memory, now with the latest BIOS revs I can set CL6 without issue.
There are still some older/low end boards that have issues with the 1:4 memory multi.
Redhat_ownage is correct, the lowest timings at the highest frequencies possible is best.
Now if I had a choice between 6-6-6-18 @ DDR3-1333 and 7-7-7-21 @ DDR3-1600 I would go with the CL6 @ 1333, simply because they are basically the same performance, but 1333 is easier on the system.