Instead of dropping the Ram divider IE 1600 to 1333, you can over volt the Ram. Most Ram is ok up to 1.65v without active cooling. Also while keeping the Same divider if you come into stability issues, you can loosen the Cas latencey from 8 to 9 for example. Usually Cas 9 is good up to and beyond 933 or 1866mhz.
The key is to overclock a little at a time, write down your settings, and test. 10-20 reference clock jumps aren't the right way to do it unless your really familiar with your system like most guys here are already.
When I OC my 8320, I notice the board automatically sets the HT speed from 2600 to 2000mhz linked to the NB. This is fine unless your running SLI/XFire x2-3 ect. cards. Most NB speeds are good around 2500mhz. I keep mine here or under after a high reference clock just for stability. Having the HT at this speed is perfectly fine linked cause it's native is actually 2.6ghz so there no need to OV the HT. The Cpu/NB voltage may need a bump, usually no more than 1.35v.
Cpu voltage can be set to whatever your usual multiplier OC is. So if your using say 1.4125v @ 4.4ghz multi only, likely you won't need more at the same speed using reference clock overclocking.
Hopefully some of this info helps, it would be easier with system specs and cpu-z's. Could walk you through it (with the help of all the members here) you'll have a nice OC in no time.