Gigabyte X38/P35/P965 (DS* DQ* S3) Overclocking and General BIOS tweaking Guide

[Chike]

Originally Posted by Salty

There are the pci and mch skew settings too. May help stabilise an on the edge overclock, but for me last resort as they dampen benchmark performances.

CPU you mean?
For my understanding they are just shifting clock signals arrivel to sunchrinize between the CPU and MCH Clock skew - Wikipedia, the free encyclopedia
What impact did they have on performance?

[Salty]

ya, cpu. Benchmark performance would be slightly lower than it would be without skew; I c skew as sacrificing the edge of performance in search of stability. I have not used it much since noting that.

[Chike]

How do you make that? I don't see relation to performance at all. The skew is made to correct synchronization between MCH and CPU. It's related to high FSB frequency not performance directly.

[Salty]

Saw it in benchmark testing, as i said. Is this contrary to yr experience?

[Chike]

No I can't get to high FSB where it's needed. But is it just as GTLREF, not a performance settings but integrity settings, and unlike GTLREF you can compansat for with VTT I don't know what you can change instead of the skew when it is needed.

[Salty]

Sounds right. Maybe I used cpu skew when it was not truly necessary.

[PlayerMusti36]

MY PC:

Q6600 G0
4096Mb Samsung CL5 800Mhz
ati hd 4890 oc 1gb gddr5
gigabyte p35-s3g

i cant overclock this on bios why? only on windows with easy tune6...
can you tell me why I do not overclock my cpu can say about bios?

[Chike]

Originally Posted by PlayerMusti36

MY PC:

Q6600 G0
4096Mb Samsung CL5 800Mhz
ati hd 4890 oc 1gb gddr5
gigabyte p35-s3g

i cant overclock this on bios why? only on windows with easy tune6...
can you tell me why I do not overclock my cpu can say about bios?

To answer that we will need the settings you have tried and failed.
Please make your own thread, post failed settings using the template in this post.
A ascreen capture of MemSet main(click >>) and SPD(click spd) windows will be helpful. You can download MemSet from Latest Overclocking Programs, System Info, Benchmarking, & Stability Tools
Also please fill your forum signature with your system specs, including BIOS vers. board rev. and a link to your ram specs or at least model/part number.
If you have not began by loading BIOS optimized defaults please do so and re-apply any changes you made so far.

[PlayerMusti36]

i have the bios version F5
revision is A2

i have the settings:

Advanced BIOS Features
Hard Disk Boot Priority [Press Enter]
First Boot Device__________ [Hard Disk]
Second Boot Device_________ [CD-ROM]
Third Boot Device__________ [Disabled]
Password Check_____________ [Setup]
HDD S.M.A.R.T. Capability__ [Disabled]
CPU Multi-Threading________ [Enabled]
Limit CPUID Max. to 3______ [Disabled]
No-Execute Memory Protect__ [Disabled]
CPU Enhanced Halt (C1E)____ [Disabled]
CPU Thermal Monitor 2(TM2)_ [Enabled]
CPU EIST Function__________ [Disabled]
Virtualization Technology__ [Disabled]
Full Screen LOGO Show______ [Disabled]
Init Display First_________ [PEG]

Integrated Peripherals
SATA AHCI Mode__________ [Disabled]
SATA Port0-3 Native Mode [Disabled]
USB Controller__________ [Enabled]
USB 2.0 Controller______ [Enabled]
USB Keyboard Support____ [Enabled]
USB Mouse Support_______ [Enabled]
Legacy USB storage detect[Enabled]
Azalia Codec____________ [Disabled]
Onboard H/W LAN_________ [Enabled]
SMART LAN_______________ [Press Enter]
Onboard LAN Boot ROM____ [Disabled]
Onboard SATA/IDE Device_ [Enabled]
Onboard SATA/IDE Ctrl Mode [AHCI]
Onboard Serial Port 1___ [Disabled]
Onboard Parallel Port___ [Disabled]
Parallel Port Mode______ [SPP]

Power Management Setup
ACPI Suspend Type [S1(POS)]
Soft-Off by PWR-BTTN [Delay 4 Sec.]
PME Event Wake Up_________ [Disabled]
Power On by Ring__________ [Disabled]
Resume by Alarm___________ [Disabled]
x Date (of Month) Alarm Everyday
x Time (hh:mm:ss) Alarm 0 : 0 : 0
HPET Support (Note)_______ [Enabled]
HPET Mode_________________ [64-bit mode]
Power On By Mouse_________ [Disabled]
Power On By Keyboard______ [Disabled]
KB Power ON Password______ [Enter]
AC Back Function__________ [Soft-Off]

PnP/PCI Configurations
PCI1 IRQ Assignment [Auto]
PCI2 IRQ Assignment [Auto]
PCI3 IRQ Assignment [Auto]

PC Health Status
Reset Case Open Status [Disabled]
Case Opened No
CPU Warning Temperature___ [70oC / 156oF]
CPU FAN Fail Warning______ [Disabled]
SYSTEM FAN Fail Warning___ [Disabled]
POWER FAN Fail Warning____ [Disabled]
Smart FAN Control Method__ [Disabled]

MB Intelligent Tweaker(M.I.T.)
Robust Graphics Booster___________ [Turbo]
CPU Clock Ratio (Note)____________ [9]
CPU Host Clock Control_ [Disabled]
CPU Host Frequency (MHz)__________ [266]
PCI Express Frequency (Mhz)_______ [Auto]
C.I.A. 2__________________________ [Disabled]
System Memory Multiplier (SPD)____ [Auto]
Memory Frequency (Mhz) 800
DRAM Timing Selectable_______ SPD __ [Auto]
CAS Latency Time_____________ 6 ____ [auto]
Dram RAS# to CAS# Delay______ 6 ____ [auto]
Dram RAS# Precharge Delay_____6 ____ [auto]
Precharge Delay (tRAS)________18 ____[auto]
ACT to ACT Delay (tRRD)_______x _____[auto]
Rank Write to READ Delay______x _____[auto]
Write to Precharge Delay______x _____[auto]
Refresh to ACT Delay________x _____[auto]
******** System Voltage NOT Optimized ********
System Voltage Control____ [Manual]
DDR2 OverVoltage Control__ [Normal]
PCI-E OverVoltage Control_ [Normal]
FSB OverVoltage Control___ [Normal]
(G)MCH OverVoltage Control [Normal]
CPU Voltage Control_______ [1.250V]

I tried the following settings

MB Intelligent Tweaker(M.I.T.)
Robust Graphics Booster___________ [Auto]
CPU Clock Ratio (Note)____________ [9]
CPU Host Clock Control_ [Enable]
CPU Host Frequency (MHz)__________ [333]
PCI Express Frequency (Mhz)_______ [100]
System Memory Multiplier (SPD)____ [Auto]
Memory Frequency (Mhz) 800
DRAM Timing Selectable_______ SPD __ [Auto]
CAS Latency Time_____________ 6 ____ [auto]
Dram RAS# to CAS# Delay______ 6 ____ [auto]
Dram RAS# Precharge Delay_____6 ____ [auto]
Precharge Delay (tRAS)________18 ____[auto]
ACT to ACT Delay (tRRD)_______x _____[auto]
Rank Write to READ Delay______x _____[auto]
Write to Precharge Delay______x _____[auto]
Refresh to ACT Delay________x _____[auto]
******** System Voltage NOT Optimized ********
System Voltage Control____ [Manual]
DDR2 OverVoltage Control__ [+0.1V]
PCI-E OverVoltage Control_ [+0.1V]
FSB OverVoltage Control___ [+0.1V]
(G)MCH OverVoltage Control [+0.1V]
CPU Voltage Control_______ [1.300V]

two restarts -.- and the settings are 9x 266 -.-

[Chike]

You need to set System Memory Multiplier manually to 2.40B otherwise the memory will run as DDR-1000 and may not be up to the task with relatively low voltage even with the looser timings.
Please understand that it will be easier to assist you in a new thread, and the detail in your signature are also essential.