PangingJr

for CPU FSB (CPU Host freq) upto 416 (416+1) MHz try using 4:5 (2.5x) or 2:3 (3x),
for CPU FSB above 417 MHz up try using 5:6 (2.4x), or 1:1 (2x).

there are 2 ways to optimize your memory subsystem performance via the motherboard's BIOS (could be more)...

the first one is...
to set 5-5-5-15, Performance Enhance as Turbo, Option 2 (for DDR2 speed over 1000 MHz, however, this can be vary, depending on your memory modules), and first leave the rest of the DRAM settings to Auto... and then save the new BIOS setting and reboot the computer.

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then enter BIOS setup program right away, and type in the rest of the DRAM settings, include the 2 values of the tRD's using the new reported values from the SPD column on the left.
and then check to make sure that you feed the vCore and vDIMM enough voltages, and save this new BIOS setting, reboot the computer into the Memtest if you like, otherwise try booting into Windows.


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and the second way is...
to set 5-5-5-15, the first tRD value enter 5 or 6 or 7 (you will need to try this out), Performance Enhance as Turbo (or you may need to leave this option to Standard, this depends on your hardwares)


note-- i cannot guarantee if you will be able to use this how to and that it'll work on your hardwares, since i only found and tried this out myself and it's only under one set of hardwares that i have tried it.

btw, the Gigabyte P35-DS4 board is one of the best board i have ever used, it's just take a few of my free time to check it out.
almost return this board on the first day i got it, when i first found out how poor the memory subsystem performance was, LOL. it's now a lot better.

this board is very stable platform, it provides more than good enough RAID subsystem performance, very easy to overclock on both the processor and memory modules, it also uses low chipset voltages, sometimes vDIMM too, there was times i forgot to check and chance vDIMM, this due to i've been booting the system like 100's times already in a week, just to play with the board and i can check all the hardware system limit or FSB walls, so there was a time, if i can recall, it boots DDR2-1000 with 1.85V, DDR2-1110 2.1V and i let it loads Windows. so check vDIMM each time after you changed its running frequency or multi or timing, cause this board boots just about anything. LOL.


third way.
with F5f BETA BIOS there is another way to optimize your memory subsystem performance... via system BIOS and then Memset program.
this one work well under lower CPU FSB, 404 - 416 MHz and when using 2:3,
in the case that you cannot set 5-5-5-15 and include the tRD value along with using the Turbo option,

for CPU FSB 404 - 416 MHz, and if you are already use a CPU with 9x you will be at 36xx - 37xx MHz, and if your memory modules can run DDR2-1212 - DDR2-1248 MHz, then try this way...

set in your BIOS... Turbo, Option 2, 2:3 (memory 3.0x), and leave the DRAM timing settings to Auto,
you should be able to boot into Windows with has already a tight memory timings and with Performance Level 7.
then you can just start the Memset, and just change the Performance Level to 5, and run ORTHOS for like 30 mins (i suggest you run it again for a longer time, when you can.), and see, if there is no error, then i think this is almost the best you can achieve, and with just some easy steps.

this way can also be used with the F4 BIOS, however, the Turbo option is still not working and the Performance Level 5 may not be workable.

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it's now has no huge system memory performance drop due to the chipset strap changes at after 417 MHz CPU FSB in... Beta BIOS F5g.

i've checked with an E6750 and ran 4:5, the system performance keeps rising after the 417 MHz, and in this BIOS the Turbo (BIOS Performance Enhance options) is fully functional, and therfore, Memset program is now just an optional, but not necessary any more. (after the Turbo is alreday set in BIOS you can check this by runing EasyTune5, and if the hardware works with this BIOS option, you will see in the EasyTune5 that, the Turbo is enabled. and you can run either Everest or Memset to see whather the memory timings and the PL level are both in a lower numbers than before)

i'm sure that BIOS F5 final should be available soon, and hoping the system performance and next BIOS will steady improve after that.