it's not the ram.
whats the cpu/nb speed?
Main timings mean little of the subtimings are maxed out.
I suspect that maybe your RSY PSU is not providing the power it needs.
Jonny guru rates it "below mediocre."
However power supply issues is not always indicative of the power supply not being able to push the power (although it usually is), but if it is not capable of pulling the power from the wall you can still have issues even without tripping the breaker or blowing a fuse.
I do not know where you live, but even in my area power if you live in an old house you can have issues.
First try moving your PC to a dedicated breaker. If this absolves the problem figure out what else is on the circuit you usually use and remove the high draw devices. I recommend this because it is the free test.
the next test is getting a kill-a-watt or some other load draw (nothing fancy just something you can watch the load on) and check you peak wattage when frame rate drops. I bet you are pushing over 450W. Which for a good PSU is nothing. But that one.... it is only rated for 480W on the 12v line, and that is in ideal manufacturer conditions.
You obviously have some type of monitoring software running. This increases overhead, but add on CPU monitoring too it. Does CPU performance hit 100% when the GPU frame rates drop? that is indicative of CPU bottlenecking in conjunction with a drop in frame rates. (i assume it always the same spot of the game?)
I agree that 1600 MHz RAM is the optimal for the 965BE higher if you go BD, but the difference is still minimal and nothing you would actually notice in performance, only in framerates that are monitored.
Lastly, the BD cores are poorer performers per core than the phenom II and thubans. If anything I would say get a used thuban (phenom II x6 cpu) or a zosma, but I personally would not use a hyper 212 on anything more than an ath2 dual core. Oh wait I am
the problem is not in the cooling ability but their low maximum load capability. once you hit it the delta increases way too fast.
However all this is moot if you are decrypting BDROMS or running HD video on a second monitor while you are gaming, in that case, yes. MOAR CORES!!!
I been playing through MW3 on my AIWHD (3650) and an ath2 270 (stock because of a cheap motherboard that cant OC past 205 HTT), and I am HDD limited. How do I know? well my Vrap is 90% full and I only get stuttering at loading screens
EDIT: Fixed spelling but one more thing. I mentioned the second monitor and watching videos because that is what I do while playing CPU demanding games like civ5 or total war. I currently can not do to my "below mediocre" setup lol