If you can run at 8-8-8-21 without any stability issues you should be running at 8-8-8-21. Why: it's not 9-9-9-24, which is not optimal for low-timing-favouring AMD.
Generic memory (aka 1333 9-9-9-24 rated) usually doesn't overclock well because generic memory isn't made to overclock; this memory is usually used in prebuilts and systems that cannot set the timings. The generic settings are at the absolute bottom end of DDR3 and any DDR3 chips/ICs can be made to run at those with 1.5V, so as a result, often lower-binned or worse-overclocking ICs are used, which often hold back your overclock if you use the ref. clock/FSB (and you have to because the 640 is locked). To sum it all up, there's usually always a 1600 9-9-9 memory kit for the same or lower price (which ~70% of the time overclocks better depending on the kit) which is why I'm hereditarily against 1333 CL9 and often facepalm at people using such memory.
-You dislike cl9 1333 (understandable)
-if the ram is stable at 8-8-8-21, I should run it there to possibly help with stability, since AMDs like lower timings.
-I should get new ram as soon as possible, which would probably fix my stability issues.
While yes, Mushkin isn't a top of the line ram company, in my opinion, they are far from generic. It seems that a lot of their ram overclocks well, the ram I got does not, and I new this before buying it. As well, I don't think Ive ever seen any Mushkin ram get bad ratings and reviews. I just figured that keeping the ram at or below stock ratings would be stable even though other stuff is overclocked.
So you understand why I chose to go ahead with low end ram (in specs, not quality), going into it knowing it wouldn't overclock much, if any: I paid $59 for the 8Gig set with free shipping, new.
Edited by Kyrle - 1/21/11 at 6:13pm