So far I have been able to get to 281 fsb...then no boot. I raised the vcore to up bit by bit until i reached 1.4v, but I was still getting random errors and did not get as far as the xp load screen, I was getting corrupt file errors (nfts file?) and it would freeze on the safe mode/normal mode screen. Surely I don't need even higher voltage?
I can't get very far
- Thread starter mrapoc
- Start date
please tell me you've locked your PCI express frequency or kept it under 120 max (I've locked mine at 100). Not doing so can cause your SATA drives to lose connection or cause data corruption. Also keep your PCI clock sync mode locked at 33.33Mhz to prevent the PCI bus floating with your FSB. You'll find both under 'advanced settings' in your bios
What BIOS version are you running, I'm using 0711 (the latest, as mrapoc informs me is 0804 )
BIOS
1. Disable ‘AI Tuning’ and set it to manual
2. Set PCI Express (PCIe) frequency @100Mhz
3. Set PCI frequency @33Mhz
4. Disable ‘spread spectrum’
5. Disable Q-Fan
6. Disable ‘Max CPUID limit
7. Disable ‘C1E’
8. Disable Intel Speedstep
9. Disable any other thing you don’t use
10. Do not enable any speed enhancements you see
The purpose here is to lighten up duties placed on the chipset
Memory Adjustments
Set ‘DRAM Frequency’ to DDR2-533 @266Mhz FSB (1FSB:1RAM operation)
As you increase the FSB, the RAM will follow in the pattern of 1:1 shown in BIOS.
1. Set ‘DRAM Timing’ to manual or disable SPD
2. In BIOS you will see 4 separate timing digits, change them to the ones specified on your RAM
e.g. 4-4-4-12
CAS# Latency (tCL)
RAS# to CAS# Delay (tRCD)
RAS# Precharge (tRP)
RAS# Precharge Delay or Active to Precharge (tRAS)
When 1FSB:1RAM is overclocked above the rated frequency of your RAM use the following values
Timing: 5-5-5-15
vDIMM: 2.2V
e.g. DDR2-667 4-4-4-12 1.9V operating at ~400Mhz will need to be set to 5-5-5-15 2.2V
3. Leave the rest of other timings either at ‘Auto’ or at their default values
Voltage
1. Set DRAM/DIMM Voltage (vDIMM) to 2.1V or 2.2V if specified by RAM (+0.3V or +0.4V)
2. Set NB Voltage to 1.55V
3. Set FSB Voltage (vFSB) to 1.40V
4. Increase SB Voltage (vICH) by lowest possible increments available on your motherboard
5. Set CPU Voltage (vCore) - E6600=1.400V
Frequency Control
First attempt:
1. Set CPU Host Clock/Frequency (FSB) to 333Mhz
2. Set CPU Clock Ratio or Multiplier to the default value for your processor which is E6600-> 333x9=2997
3. Save settings and reboot
Further attempts:
1. Up even more FSB by 5Mhz or 2Mhz increments
2. Calculate your final clockspeed
3. Up even more vCore if needed by 0.025V increments
Once you've done that you need to check for stability - Prime and Memtest
*The higher the final clock speed, the lower the temperature for CPU has to be to maintain stability
*vCore should not fluctuate by more than +/- 0.100V. If it does, improve cooling on MOSFETs
* If an attempt fails and the computer doesn’t boot, hold down ‘Insert’ key when booting to restore default settings in BIOS
Final
- Lower vCore by one notch at a time until lowest possible while maintaining the same stability
- Do the same for vMCH, vFSB, vICH after the above step is completed
- (Optional) Pull off a PCMark and/or SuperPi32M score and compare to stock to gauge performance increase
BIOS
1. Disable ‘AI Tuning’ and set it to manual
2. Set PCI Express (PCIe) frequency @100Mhz
3. Set PCI frequency @33Mhz
4. Disable ‘spread spectrum’
5. Disable Q-Fan
6. Disable ‘Max CPUID limit
7. Disable ‘C1E’
8. Disable Intel Speedstep
9. Disable any other thing you don’t use
10. Do not enable any speed enhancements you see
The purpose here is to lighten up duties placed on the chipset
Memory Adjustments
Set ‘DRAM Frequency’ to DDR2-533 @266Mhz FSB (1FSB:1RAM operation)
As you increase the FSB, the RAM will follow in the pattern of 1:1 shown in BIOS.
1. Set ‘DRAM Timing’ to manual or disable SPD
2. In BIOS you will see 4 separate timing digits, change them to the ones specified on your RAM
e.g. 4-4-4-12
CAS# Latency (tCL)
RAS# to CAS# Delay (tRCD)
RAS# Precharge (tRP)
RAS# Precharge Delay or Active to Precharge (tRAS)
When 1FSB:1RAM is overclocked above the rated frequency of your RAM use the following values
Timing: 5-5-5-15
vDIMM: 2.2V
e.g. DDR2-667 4-4-4-12 1.9V operating at ~400Mhz will need to be set to 5-5-5-15 2.2V
3. Leave the rest of other timings either at ‘Auto’ or at their default values
Voltage
1. Set DRAM/DIMM Voltage (vDIMM) to 2.1V or 2.2V if specified by RAM (+0.3V or +0.4V)
2. Set NB Voltage to 1.55V
3. Set FSB Voltage (vFSB) to 1.40V
4. Increase SB Voltage (vICH) by lowest possible increments available on your motherboard
5. Set CPU Voltage (vCore) - E6600=1.400V
Frequency Control
First attempt:
1. Set CPU Host Clock/Frequency (FSB) to 333Mhz
2. Set CPU Clock Ratio or Multiplier to the default value for your processor which is E6600-> 333x9=2997
3. Save settings and reboot
Further attempts:
1. Up even more FSB by 5Mhz or 2Mhz increments
2. Calculate your final clockspeed
3. Up even more vCore if needed by 0.025V increments
Once you've done that you need to check for stability - Prime and Memtest
*The higher the final clock speed, the lower the temperature for CPU has to be to maintain stability
*vCore should not fluctuate by more than +/- 0.100V. If it does, improve cooling on MOSFETs
* If an attempt fails and the computer doesn’t boot, hold down ‘Insert’ key when booting to restore default settings in BIOS
Final
- Lower vCore by one notch at a time until lowest possible while maintaining the same stability
- Do the same for vMCH, vFSB, vICH after the above step is completed
- (Optional) Pull off a PCMark and/or SuperPi32M score and compare to stock to gauge performance increase
[edit] - too slow PV5150 beat me to it with a much better and extended version 
ps. the latest official bios is 0804
ftp://ftp.asus.com/pub/ASUS/mb/socket775/P5B Deluxe Wifi-AP/
there is also a beta 0903 floating around
i flashed to it the other day and it seems fine to me
ps. the latest official bios is 0804
ftp://ftp.asus.com/pub/ASUS/mb/socket775/P5B Deluxe Wifi-AP/
there is also a beta 0903 floating around
i flashed to it the other day and it seems fine to me
