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Re: DFI LP UT P35-T2R bios templates
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28-08-2007, 04:18 PM
#2 (permalink)
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Bios settings explained:
Explanation of some bios settings from windwithme at
http://www.xtremesystems.org/forums/...d.php?t=154151 and from DFI.
Exist Setup Shutdown: Mode 1 versus Mode 2- Mode 1: when the system was boot-up, it will run a little “diagnose”.
- If the CPU frequency doesn’t change too much, it will skip the “shutdown”
- function and rewrite the clock generator directly.
- Mode 2: no matter how little the clock or DRAM’s ratio has been changed, the system still “shutdown” and reboot by itself.
Clock VCO Divider: This function is use to fix the clock generator’s divider and “NB Strap” by its jumper. Then, system wouldn’t be reboot again because it presumed itself is
not in an overclock status. (this function needs to cooperate with particular jumper)
Boot-up clock: This function can help you out by setting a lower boot up clock as a buffer, when your FSB is tweaked too high in the beginning. The process will to be : system boot up with “Boot-up clock” first, after that it will change to your highest FSB.
PCIE Slot Config: PCIE2 / PCIE3 / PCIE4 slot speeds:
- 1X 1X : PCIE 2 / 3 / 4 are running with 1X model
- 4X NC: PCIE2 is running 4X mode, PCIE 3/4 will be disable and on board LAN1 will be disable as well.
GTL+ buffer Strength: It is adjustment option for North-Bridge reference voltage strength.
Host Slew Rate: It is adjustment option for North-Bridge voltage driving strength.
Enhance Data Transmitting: DFI specifically designed a “fine-tune mode” for DATA transmitting performance, Normal for lowest performance, Fast for highest performance, Default AUTO will automatically adjust performance based on current system Front Side BIOS.
Enhance Addressing: DFI specifically designed a “fine-tune mode” for DATA addressing, “Normal” for lowest performance, “Fast” for highest performance, Default AUTO will automatically adjust performance based on current system Front Side BIOS.
CLK fine delay: (there are channel 1,2 in current bios, it going to separate to be 4 items for DIMM1~DIMM4 in upcoming BIOS):
- Giving an easy explanation, after the CPU, PCIE, DRAM locked the clock phase by “PLL phase locked loop”, we can utilize the DRAM DLL to adjust DRAM operating phase by tuning DRAM DATA output phase forward or backward to create a better match with current DATA operating phase.
- The BIOS will automatically calculate a parameter after system boot up.( The latest update BIOS will show the current value of this parameter.)
- The best tuning range for finding the best DATA operating phase will be 3 ranks before or after this current value.
Performance level: It is tRD of DRAM parameter
Read delay phase adjust: It is the fine-tune feature for tRD
MCH ODT Latency: DRAM ODT read/Write latency. Basically ODT is On Die Termination, it likes a variable resistor termination to protect DATA signal integrity from high frequency interference.