RAM Clock vs CAS?

[Trann]

I asked yesterday how i would go about changing the RAM timings of my CL 4 memory to actually be CL4 in bios.

Sure enough, my computer did not boot after i changed my ram from CL 5 to CL 4 It's running at 907 mhz CL5 atm, and can do a bit higher than that.

My RAM is 4 sticks of Corsair XMS2 800mhz CL4 1GB on a Gigabyte P35-DS4.


If i want my memory to run at CL4 i have the following options:

a) Lowering the CPU clock so that the memory clock lowers with it and reaches stable levels. Which will mean less clocked ram AND cpu.

b) Lowering the memory speed multiplier, but do that, i need to do a giant leap from 2.4 to 2! That means my memory will run at 756 mhz, which is below spec! The only multipliers availible are 2, 2.4, 2.5, 3 and higher.

Both options seem horrible to me, is it really worth the 1 less cas latency?
Or are there some tricks that i don't know about

 

[Trann]

I have the motherboard set to auto regulate all the voltages, i have no idea what it's running at

Or what it's supposed to run at, for that matter

 

[Trann]

I believe that standard DDR2 voltage is 1.8v so that's what you ram is currently receiving

Actually i don't think so, because i have the motherboard set to auto REGULATE the voltage, not to set it to factory defaults.. it works somewhat like.. the more you overclock, the mode voltage your components get.. but yes, i will try to manually specify it when i get home from work today.

But still, i'd like to know how much CAS can improve the memory performance?
To put it in rather simplish way...
CL4 800mhz to CL5 800 mhz is like.. CL5 800mhz to CL5 xxx mhz

fill in the xxx