What your hardware specification first?
Then go search for particular thread that are existed in OCU.

-pWs-

Why u wanna OC your ram only? OC your CPU by bringing up the FSB will also OC your ram together is u have a 1:1 divider~

Why u wanna OC your ram only? OC your CPU by bringing up the FSB will also OC your ram together is u have a 1:1 divider~

fsb:dram ratio is something like multiplier. it works like this:

base clock x dram multiplier = dram clock

let say in this setting:
cpu in stock setting = 2.4GHz, 266MHz base clock,
fsb:dram = 1:1 = 1/1 = 1
base clock x dram multiplier = dram clock
266 x 1 = 266MHz
for this setting, your dram clock is 266MHz.

let say another setting:
cpu in stock setting = 2.4GHz, 266MHz base clock,
fsb:dram = 2:3 = 3/2 = 1.5
base clock x dram multiplier = dram clock
266 x 1.5 = 400MHz
for this setting, your dram clock is 400MHz

let say another setting:
cpu in overclocking setting = 3.0GHz, 333MHz base clock,
fsb:dram = 1:1 = 1/1 = 1
base clock x dram multiplier = dram clock
333 x 1 = 333MHz
for this setting, your dram clock is 333MHz

its ok, just let your ram run at 400MHz, since your ram is DDR2 800.

what application you are using? 4gb ram still not enough?
not sure about the conflict.

you using windows 7 32 bit version?
how much is your ram usage?  

32bit normally they will reserve some memory so you won't get to use all of it

i see., i think in this case you may consider change to 64bit windows, but make sure those online game support 64bit windows, if not you cannot play also.
i think overclock ram didn't help much in this problem, because even you can overclock your ram to DDR2 1200, but it also eat up to 3gb ram when you load all your online game. just the bandwidth will be wider and the data rate will be faster only.