Originally Posted by fabrizziop
It's fine, just use the 1.65V and 9-9-9-27 timings for both modules, it will work fine.
Actually there is no way to know for sure without testing - as many people have found. It may or may not work without errors even with "11" latencies. It just depends on how the IMC, mobo and different RAM IC's play together...
many a person has had to pull one set of RAM because two different DDR3 RAM kits or DIMMs would not play nice even though in theory they should all work fine together.
Originally Posted by Boyboyd
Another way of approaching it would be to drop the Crucial Ballistix to 9-9-9-24 and drop the voltage for both of them to 1.5v
Many times RAM rated at 1.65v doesn't run reliably at 1.5v without errors. The OP may be able to run it that way, but only testing will tell.
Originally Posted by james_rich
But wouldent I have to overvolt the Kingstons to 1.65 to get anywhere near 1866Mhz, I heard Bulldozer improves with higher frequency.
More than likely yes
you will need to run 1.65v and slower latencies just to get the two RAM kits to work without errors - if they work at all. If you're lucky they might even OC a bit. There is no accurate means to predict the outcome when mixing RAM. That's why it's a crapshoot.
As far as performance BD will run the RAM at a higher frequency than Deneb or Thurban but unfortunately objective scientific testing has shown that there is no significant gains in real world application performance on typical AMD/Intel desktop PCs with RAM frequencies of ~1333 MHz. asDDR3 at that frequency is not a system bottleneck. increased RAM frequency does help Llano APUs because the GPU benefits from the higher frequency.
The thread below has the details if you are interested, including "damric's" FX-4100 that shows no significant gains in real world apps just as Tom's Hardware, AnandTech and X-Bit Labs saw in their testing. The synthetic benches always show a theoretical gain but in real apps it's often not there or insignificant.
http://www.overclock.net/t/1237178/is-o-cing-my-ram-worth-the-trouble/10#post_16866022Edited by AMD4ME - 5/16/12 at 7:16am