You're running 14x200, correct? (2.8 GHz DDR400 2-2-2)
Assuming you want to overclock higher, you have at least 3 options for what to do to increase your performance.
Obviously you've found your RAM cannot get much past 200 MHz 2-2-2.
Now normally, you'd need to either loosen timings (say run 2-3-2 or 3-3-2, 3-3-3, etc), or drop to a lower divider (say 166 divider) to be able to overclock higher.
But you have a chip with an unlocked multi, so you have a third option!
You could just bump up the multiplier to 15x200.
Basically, you need to prioritize CPU speed, & then worry about the RAM later.
Take the RAM out of the equation for now, use a lower divider.
Then see how far you get the CPU within whatever voltage/temps/speed goal you have.
Once you've got that figured out, then worry about the RAM.
Frankly, due to the unlocked multi, you have so many options for RAM speeds & timings it's ridiculous.
I'd try to keep the RAM @ 1:1 (i know, i know, that doesn't technically exist on AMD).
But anyway, keep it the same speed as the CPU if you can by employing the use of that unlocked multi...
Obviously, your max OC will end up being somewhere in between, so that's where you either decide to run a higher HTT (FSB) with looser timings, or a higher HTT (FSB) with lower RAM speed & tighter timings.
You can benchmark the different scenarios to decide which you like best for performance, but the difference won't be much regardless.