Fast, Normal, ULTRA?

I've read rojapak's BIOS optimization guide as well as many other literature out there about memory settings but I still have some questions. I have the following settings in my BIOS that I can't figure out...

Fast Command: Normal, Fast, Ultra
DRAM Burst Length: 4 or 8
DRAM Queue Depth: 2 level, 3 level, or 4 level
DRAM Command Rate: 1T or 2T
Write Recovery Time: 3T or 2T
DRAM Twtr: 3T or 1T

Can someone explain what these do and recommend which setting allows for the fastest memory performance? I'm currently running XMS3200 at CAS 2-2-2-6 (sync DDR333)...

thank you in advance!

heres the explanation, they are all in there: http://www.rojakpot.com/Speed_Demonz/New_BIOS_Guide/Index.htm and as always....lower is faster

I checked the guide already, and it doesn't have the info i'm looking for...

its all there....just gotta use your imagination in what those things mean. Like wtr is Write Time Recovery

A basic rule of thumb is to set EVERYTHING to the lowest possible number if U have top end ram. Mine is set to "turbo" i.e. "ultra" and the other settings are the lowest I could set them to.