This is where most overclocking begins. Using a lower multi allows you to up FSB and better RAM as well, since you now get to make better use of 1:1 for best stability. If your CPU allows, you can also get same CPU clock but now at higher FSB for more system bandwidth. It can be faster in apps that love bandwidth.
If on the origional ASUS cement for SE version, these can be good temps if if you've OC'd a bit on the mobo and a NB of 1.5v. @1.504v, I get 42c on NB & 39c on SB @ 1.10v with Fusion block.
Not sure what spacific devider you need or want, but if you leave the strap to Auto, you can get the various mixed deviders on the DRAM Frequency menu. I get 1:1/5:6/5:4/4:3/3:2/1:2. 1:1&1:2 or the most stable for me, but 1:2 is only gonna really be usefull on DDR3 so not much use here unless you got older CPU's to under 300FSB. Dont get me wrong, those early core 2's loved the 1:2 devider especially the 800FSB units. Regardless of what ratio, you need to loosen up timings a tad, increase NB, FSBT and NB GTL Ref plus Vdim to get stable. If running 4 slots, relax even further.
Here's a quick 7mn test as 480x8 in a 5:6 devider;
http://img227.imageshack.us/img227/9...31volt3xe0.png