Please Post All New Or Uncovered BIOS Options Here!

- BIOS Setting: AC'97 Audio
- Options: Enabled, Disabled
- Motherboard: GA-7ZXE
- Chipset: VIA KT133A (I think)

Since I have an SB Live!, and I've disabled the onboard Realtek sound, is it worth keeping this setting enabled? The mobo manual implies that it's a codec chip, separate from the Realtek processor. What does AC'97 en/decode, anyway?

 

- Upon investigation, this actually is the master Enable/Disable control for the onboard 'VIA Audio'. It threw me off initially, since there's a setting below to enable/disable 'Legacy Audio Support'.

 

I Recently Upgraded To An ABIT UL8 Motherboard, And While Going Through The BIOS I Found A Number Of Things That I'm Not Familiar With From Previous BIOS Experiences, Google Failed Me For The First Time When Trying To Find Information On The Terms, And I'm Hoping Someone Here Will Be Able To Help Me.

BIOS Option : M1689 Gated Clock
Options : Disabled/Enabled
Description : Unknown
Motherboard : ABIT UL8
Chipset : ULi M1689
-------------------
BIOS Option : PCI/14M/USB CLK Powerdown Or PCI/14H/USB CLK Powerdown — The Manual Lists Both In Contradictory Fashion
Options : Disabled/Enabled
Description : Unknown
Motherboard : ABIT UL8
Chipset : ULi M1689
-------------------
BIOS Option : M1689 HTT Tristate
Options : Disabled/Enabled
Description : Unknown
Motherboard : ABIT UL8
Chipset : ULi M1689

Thanks For Any Info.

 

Hi, everyone!

Does anybody know what this bios option do?

BIOS Option : CPU Disconnect Feature
Options : Disabled/Enabled
Description : Unknown
Motherboard : ABIT NF7 2.0
Chipset : nVIDIA nForce 2

TIA.

 

Another obscure setting from my bios. I think it could be a misnomer for PCI Delayed Transaction/PCI 2.1 Compliance but I would like Adrian or anyone else would confirm.

BIOS Option : Enhance PCI Performance
Options : Disabled/Enabled
Description : Unknown
Motherboard : ABIT NF7 2.0
Chipset : nVIDIA nForce 2

 

No idea what these options do. Any ideas the best settings for these?

BIOS Option : Memory hole

Options : Enabled, Disabled

Description : "When enabled, allows the rom area f000h ffffh to be cacheable when cache controller is activated.

Motherboard : p4m 800t

Chipset : VIA PT800



BIOS option: Direct frame buffer

options: enabled, disabled

description: None (its located in the agp and p2p bridge control)

Chipset VIA PT800

 

Located in "Advanced Chipset Features" \ "LDT & PCI Bus Control"

BIOS Option : HT Stop Tristate

Options : Driven (Default), Tristate

Description : n/a

Motherboard : Abit kv8pro 1.1 revision with BIOS .23

Chipset : VIA K8T800 Pro

Edit: Found this today. Quoted from here

I still have no clue which setting is better.

 

P4P 800SE Power Mystery

Adrian-
I bought the book and reviewed the updates but can't find any reference to the following setting in the BIOS of the
Asus P4P 800SE mobo:
Asus P4P 800SE/ NB=Intel 865PE/ SB=Intel ICH5R
2x512MB of Corsair XMS DDR400 PC 3200
CPU= P4 2.6GHZ Northwood Core 800FSB (temp 30c w/ Zalman 7000)
1x XFX6800nu AGP (Temps 50c w/ Zalman 700)
1 x WD 160GB 8MB cache SATA
PSU=PC P&C Silencer 360ATX: 360watts continuous, 400 watts peak, 21a on 12v

BIOS Option : i.e. Repost Video on S3 resume
Options : i.e. yes , no
Description : i.e. POST video BIOS on S3 resume

BIOS Option : i.e. ACPI 2.0 SUPPORT
Options : i.e. yes no
Description : i.e. Allows you to add more tables to the ACPI 2.0 Specifications

BIOS Option : i.e. ACPI APIC SUPPORT
Options : i.e. Enabled, Disabled
Description : i.e. Allows you to enable the ACPI support in the APIC. When enabled ACPI APIC table pointer is included in the RSDT pointer list.

 

BIOS option: LBA/Large Mode [Disabled/Auto]
Mobo: Asus P5GPL
Chipset: Intel 915PL
Found under Primary IDE Master (hard drive)

Can't find it here. What setting should I put?

BR szm

 

Thanks Adrian and the book is great! I have learned quite a bit from it. It just amazes me that Asus would put such arcane settings in the BIOS of what is a rather mainstream mobo. I installed the P4P in my wifes PC because I wanted a simple, easy to use, straightforward mobo that would O/C slighty and then never have to be touched again. Yup, that's what I was thinking. LOL I can get my A8N SLI Deluxe to sit up and beg but this mobo has me scratching my head. Any help or guidance would be appreciated.
Merc

 

Hey, everyone!

I have found out what CPU Disconnect Feature does.

MAINBOARD: ABIT NF7 (PCB 2.0)
CHIPSET: NFORCE2 Ultra 400 (Crush 18)
BIOS: Latest (v.2.7)

when set to enable the system will disconnect the S2K FSB (Athlon bus) on a C1 state thus decreasing your CPU temperature (some people say even 15C degrees) and also allows CPU for better idle time usage.
Some other people report better performance when this setting is DISABLED.

 

As for Enhance PCI Performance....

MAINBOARD: ABIT NF7 (PCB 2.0)
CHIPSET: NFORCE2 Ultra 400 (Crush 18)
BIOS: Latest (v.2.7)

It seems it's meant for improving PCI RAID performance (as ABIT description states) but, as usual, some people are having problems with IDE drives and/or CD burners. You will have to try it by yourself. For me, it seems to work just fine (I think it may depend on your PCI cards, whether they would be picky or not).

PS - I am just amazed to see how many misnomers manufacturers tend to put into bioses. It makes things more difficult.

 

Advanced Chipset Features

BIOS Option : K8<->NB HT Speed
Options : 1x, 2x, 3x, 4x, 5x. (1x = 200MHz, 2x = 400MHz, 3x = 600MHz, 4x = 800MHz, 5x = 1000MHz)
Description : "This item allows you select the Hyper Transport speed between CPU and North bridge."

BIOS Option : NB-->SB HT Speed
Options: 1x, 2x, 3x, 4x, 5x.
Description : "This item allows you select the HT speed of North bridge to South bridge."

BIOS Option : NB<--SB HT Speed
Options: 1x, 2x, 3x, 4x, 5x.
Description : "This item allows you select the South bridge to North bridge HT speed."

BIOS Option : K8<->NB HT Width
Options: ↓16 16↑, ↓8 8↑.
Description : "This item allows you select the Hyper Transport width between CPU and North bridge."

BIOS Option : NB<->SB HT Width
Options: ↓16 16↑, ↓8 8↑, ↓4 4↑.
Description : "This item allows you select the HT width between North bridge and South bridge."

BIOS Option : HT Spread Spectrum
Options: Disabled, Center, Down.
Description : "This option reduces the EMI generated by the HT."

BIOS Option : Special I/O for PCI card
x - Base I/O Address 0000
x - I/O length 1 Byte
Options: Disabled, Enabled.
Description : "This item allows you select the base I/O address and length for PCI card."


DRAM Configuration

BIOS Option : Read Preamble Value
Options: Auto, 2.5ns to 9.5ns in 0.5ns increments.
Description : "n/a"

BIOS Option : Async Latency Value
Options: Auto, 1ns ~ 15ns.
Description : "n/a"

BIOS Option : IdleCycle Limit
Options: Auto, 4, 8, 16, 32, 64, 128, 256.
Description : "n/a"

BIOS Option : Dynamic IdleCycle Counter
Options: Auto, Disabled, Enabled.
Description : "n/a"

BIOS Option : R/W Queue Bypass Count
Options: Auto, 2, 4, 8, 16.
Description : "n/a"

BIOS Option : Bypass Max
Options: Auto, 0 ~ 7.
Description : "n/a"

BIOS Option : DQS Skew Control
Options: Auto, Increase, Decrease.
Description : "n/a"

BIOS Option : S/W memory hole Remapping
Options: Enabled, Disabled.
Description : "n/a"

BIOS Option : H/W memory hole Remapping
Options: Enabled, Disabled.
Description : "n/a"


Integrated Peripherals / Onboard devices

BIOS Option : USB Memory Type
Options: Base memory, Shadow memory.
Description : "Select used memory space to record USB device information"

BIOS Option : USB Park Mode
Options: Enabled, Disabled.
Description : "n/a"

BIOS Option : USB TD Reads
Options: non-ISO Queue, ISO Queue.
Description : "n/a"

BIOS Option : USB Periodic Data Reads
Options: non-ISO Queue, ISO Queue.
Description : "n/a"

BIOS Option : USB Asyn Data Reads
Options: non-ISO Queue, ISO Queue.
Description : "n/a"


PNP/PCI/PCI-E Configuration

*** PCI Express related items ***
BIOS Option : Maximum Payload Size
Options: 128, 256, 512, 1024, 2048, 4096.
Description : "Set maximum TLP payload size for the PCI Express devices. The unit is byte."


Motherboard : EPoX 9GF6100-M
Chipset : NVIDIA GeForce 6100 / nForce 410

 

DDR Clock Skew

On the A8N32SLI-Deluxe from ASUS, an Nforce4 chipset motherboard:

Under the Advanced -> Jumperfree Configuration

DDR Clock Skew ("Allows you to select the DDR Clock Skew." - from manual)
Options: Auto (default), then Advanced or Delay by 150ps (picoseconds?) increments up to +/- 900.

What does this do? How does it affect memory timings? How can we use this optimize performance, if at all?

Your BIOS guide is great Adrian, keep up the good work.