Please Post All New Or Uncovered BIOS Options Here!

Discussion in 'BIOS Optimization Guide (BOG)' started by Adrian Wong, Jan 14, 2003.

  1. lammypie

    lammypie Newbie

    CPU Disconnect

    CPU Disconnect - couldn't find this in the guide. Anyone know what it does?

  2. Chai

    Chai Administrator Staff Member

    I presume it's from Abit's NF7? It's for Idling your CPU when it's not used, hence reducing temperature. If you want in detail, please post in complete format. Thanks.
  3. lammypie

    lammypie Newbie

    Cheers, sorry new here - here you go in 'complete format'

    BIOS Option : CPU Disconnect
    Options : Enabled, Disabled
    Description :
    Motherboard : ABIT NF7-S v2.00
    Chipset : NVIDIA nForce2
  4. Max_87

    Max_87 huehuehue

    Cannot find these three settings in the BOG, so i post it here :mrgreen:

    BIOS Option : Row Precharge Time
    Options : 2T, 3T
    Description : This item controls the number of cycles for Ros Address Strobe (RAS) to be allowed to precharge. If insufficient time is allowed for the RAS to accumulate it's charge before DRAM refresh, refresh may be incomplete and DRAM may fail to retain data. This item applies only when synchronous DRAM is installed in the system.
    Motherboard : MSI KT4V
    Chipset : VIA KT400

    BIOS Option : RAS Pulse Width
    Options : 6T, 5T
    Description : This setting allows you to select the number of clock cycles allotted for the RAS pulse width, according to DRAM specifications.
    Motherboard : MSI KT4V
    Chipset : VIA KT400

    BIOS Option : RAS to CAS delay
    Options : 3T, 2T
    Description : When DRAM is refreshed, both rows and columns are addressed separately. This setup item allows you to determine the timing of the transition from RAS to CAS.
    Motherboard : MSI KT4V
    Chipset : VIA KT400
  5. Max_87

    Max_87 huehuehue

    found three more here :mrgreen:

    BIOS Option : DDR DQS Input Delay
    Options : Auto, 18, 08, 0E, 0F
    Description : This setting allows you to set the delay time of DQS to improve the setup time and hold time of the data, and improve the stability.
    Motherboard : MSI KT4V
    Chipset : VIA KT400

    BIOS Option : Fast Command
    Options : Ultra, Fast, Normal
    Description : This item controls the internal timing of the CPU
    Motherboard : MSI KT4V
    Chipset : VIA KT400

    BIOS Option : Fast R-2-R Turnaround
    Options : Disabled, Enabled
    Description : Burst read operation can be interupted by new read of any bank. Random column access is allowed. READ to READ interval is minimum 1 CLK.
    Motherboard : MSI KT4V
    Chipset : VIA KT400
  6. cognitius

    cognitius Newbie

  7. drsbaitsowb

    drsbaitsowb Newbie

    BIOS Option: AGP Read Synchronization
    Options: Enable or Disable
    Description: The field allows you to enable or disable the AGP Read Synchronization feature. Settings: Enabled, Disabled
    Motherboard: MSI KT3 Ultra2-R
    Chipset: VIA KT333
    BIOS Manufacturer: AMI Version 5.7

    Have searched the internet high and low, and have not found a definition of what exactly this does, my guess is it has something to do with synchronizing the AGP bus with something else, but besides that, I know squat? HELP PLS! Thanks
  8. mjb

    mjb Newbie

    Motherboard: SOYO SY-5SSM
    Chipset: SiS 530
    Bios: Award

    BIOS Option: Ref/Act Command Delay
    Options: 5T,6T,7T,8T
    Description: set the DRAM clock of the refresh command to refresh/active command delay

    BIOS Option: Refresh Queue Depth
    Options: 0,4,8,12
    Description: set depth of refresh queue

    These were found under "Chipset features setup". I could not find info on these options anywhere.
    Maybe they are also known as by some other option name?
  9. forumid

    forumid Newbie

    A8V (VIA K8T800Pro)

    Adrian's Rojak Pot BOG is by far the best resource I've found on the Internet regarding BIOS options. The subscription is totally worth it! :thumb:

    Here’s a list of BIOS options for the Asus A8V motherboard (VIA K8T800Pro chipset) that I couldn’t find a reference to in the BOG. I apologize if any of these are listed there already under a different name; I tried to screen for that as much as possible, while looking like I’m working at my day job.

    BIOS Option : Node Interleaving
    Options : Auto, Enabled, Disabled
    Description : Sets whether to allow memory accesses to be spread out over BANKS on the same node or across nodes, decreasing access contention.

    BIOS Option : TRFC
    Options : Auto, 9-15 CLK (increments of 1)
    Description : Sets the TRFC.

    BIOS Option : TRWT
    Options : Auto, 1-6 CLK (increments of 1)
    Description : Sets the TRWT.

    BIOS Option : TWCL
    Options : Auto, 1-2 CLK (increments of 1)
    Description : Sets the TWCL.

    BIOS Option : Asynclat
    Options : Auto, 4-9 CLK (increments of 1)
    Description : Sets the Asynclat.

    BIOS Option : Read Preamble Setting
    Options : Auto, 2.0-9.0 ns (increments of 0.5)
    Description : Sets the Read Preamble in nano seconds.

    BIOS Option : Search for MDA Resources
    Options : Yes, No
    Description : Sets whether to allow search for MDA Resources

    BIOS Option : ACPI 2.0 Support
    Options : Yes, No
    Description : Allows you to add more tables for ACPI 2.0 specifications.

    This last one seems straighforward enough, but I was wondering what the recommendation would be for it:

    BIOS Option : Legacy USB Support
    Options : Disabled, Enabled, Auto
    Description : Allows you to enable or disable support for legacy USB devices. Setting to Auto allows the system to detect the presence of USB devices at startup. If detected, the USB controller legacy mode is enabled. If no USB device is detected, the legacy USB support is disabled.
  10. scottwv

    scottwv Newbie

    Here's one I don't know and can't find.

    BIOS Option : ATA 66/100 CABLE MESSAGE
    Options : Enabled, Disabled
    Description : "The choice is enable or disable". Really, you don't say!
    Motherboard : Shuttle AK32V / AK32VN
    Chipset : VIA KT266A

    I believe this will display a message if not using an ATA-133 compatible IDE cable, but not sure. As you see, the desc. in the manual is of no use.
  11. ccon

    ccon Newbie

    AGP Performance Control is another name for AGP Wait States. Disabled=2T, Enabled=1T.
  12. ja08

    ja08 Newbie

    Help with Asus P5GDC-V Delux AMI Bios

    Some of these may not be new but I'm interested in optimizing these bios settings manaully. Anyone know what are optimal settings?

    Asus P5GDC-V Delux
    Intel 915G

    Advanced > AI Overclocking
    PCI Express Frequency - [Auto] [90....150]
    PCI Clock Synchronization mode [Auto] [To CPU] [33.33MHZ]
    Spread Spectrum [AUTO]

    Advanced > Chipset
    Configure DRAM Timing by SPD [Enabled] [Disabled]
    DRAM CAS# Latency [3] [2.5] [2] Clocks
    DRAM CAS# Precharge [2] [3] [4] Clocks
    DRAM CAS# to CAS# Delay [2] [3] [4] [5]
    DRAM CAS# Activate to Precharge Delay [4] [5] ~ [15] Clocks
    DRAM Write Recovery Time [2 - 5 clocks]

    PEG Buffer Length
    Link latency
    PEG Root Control
    Slow Power

  13. DataFMT

    DataFMT Newbie

    Hello, I have three more for you.

    Motherboard : MSI KT3 Ultra ARU, BIOS 5.7
    Chipset : Via KT333

    BIOS Option : AGP Read Syncronization
    Options : Enabled, Disabled
    Description : I have no idea.

    BIOS Option : CPU HALT Command detection
    Options : Enabled, Disabled
    Description : I think it has to do with how the system will react when it reaches its maximum temprature. It is a AMD XP feature.

    BIOS Option : Clear NVRAM
    Options : No, Yes
    Description : I have no idea.

    I will ask on MSI forum and come back with more info when I got it.

  14. eLPuSHeR

    eLPuSHeR Newbie

    Hi, everyone!

    First off, forgive me if this isn't the appropiate place to post.

    Motherboard : Many
    Chipset : Many?

    BIOS Option : PCI Delayed Transaction/PCI 2.1 Compliance
    Options : Enabled, Disabled
    Description : This enables PCI delayed transactions and it is already covered in BOG.

    I just wanted to add that enabling it can make some cards (some Creative models for instance) to output crackling or poor sound. If you are having any odd problems with your sound card and you have this option enabled, try disabling it. If you have just a few pci cards (or none), the performance gain is minimal, anyway (i think it is because there are fewer PCI arbitrations).
  15. Adrian Wong

    Adrian Wong Da Boss Staff Member

    Many thanks, everyone for posting here. As always, I will be researching them and will add to the guide ASAP.

    ja08, most of the BIOS functions you posted have already been covered in the guide.

    eLPuSHeR, don't forget there are other PCI devices to consider like the PCI-to-ISA bridge, PCI-to-AGP bridge, etc.

    So, don't assume that just because you don't use any PCI add-on cards that PCI Delayed Transaction will not have any effect on your system. :mrgreen:
  16. eLPuSHeR

    eLPuSHeR Newbie

    Adrian, I know, I know but thanks for refreshing my memory. I have this option enabled in my bios. My ASUS A7V333 has a built-in (integrated) CMI8738/C3DX audio chipset. Seems to be unaffected by delayed pci transaction. That's why i have left it enabled. Cool. :wave:
  17. DataFMT

    DataFMT Newbie

    This feature seems to be related to the S2K Bus Disconnect technology. The CPU will be "shut down" if it is idleing. It will take less power and it will also be generated less heat. I have testet this function now, and it works great. Idle temp is down to 29 degrees C from 39 degrees C. I have a AMD XP 2600+ CPU.
  18. BIOS Option: REF to ACT/REF to REF (Trcfc)
    Options: 12T, 13T, 14T, 15T
    Description: Allows you to set the REF to ACT/REF to REF timing
    Motherboard: Asus A7V880
    Chipset: Via KT880
  19. Covenant

    Covenant Newbie

    Search for MDA Resources

    Theres some bits about this in odd places - people seems to think this is Monochrome Display Adaptor, to tell the AGP bridge whether to search on the PCI/(ISA if present) bus to see if it needs to map the memory space of a possible monochrome secondary display adaptor.
    Seems an odd BIOS option to add to imo though...

    ACPI 2.0 Support

    Seems odd that this is disabled by default on the A8V
  20. henka

    henka Newbie

    BIOS option: CPU Read DRAM Fast Ready
    Options: Enabled, Disabled
    Description: none

    BIOS option: CPU R/W DRAM 0WS
    Options: Enabled, Disabled
    Description: none

    Motherboard: Asrock M266A
    Chipset:VIA P4M266A

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