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OC pro's - please confirm settings please =)

Last response: in Overclocking
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March 17, 2009 5:25:19 AM

* Processor: Intel Core 2 Duo E8500 – E0 Stepping
* CPU Cooler: Xigmatek Red Scorpion S1283 w/Crossbow Backplate
* Motherboard: Asus P5Q-E
* Bios Version: 1901
* Memory: Corsair TWIN2X4096-6400C4DHX - EPP: 4-4-4-12-2T (2.1V)
* Video Card: Nvidia GeForce GTX 260 Core 216 896MB
* Power Supply: Corsair HX620W Modular Power Supply
* O/S: Windows Vista Home Premium 64-bit

Goal – To overclock to 3.8GHz (1600 FSB) with the best settings.

Note 1 – This is my first overclock, but I have read up on many how to guides and tutorials. I would like if you pros’ could look over each setting and see if all is good to go.

Note 2 – Below are the first changes I have done from default, I ran Prime95 for 6 hours, no errors. So now I will be ‘fine tuning’, but I have a few questions.

Note 3 – CPU idle temps are 26-29ºC --- load temps are 43-46ºC


Questions :
1. I set the Vcore to 1.30000 to start with and the NB voltage to 1.20 – I’m going to assume that my overall goal is to get the Vcore as low as I can stable, then bump it up 2 notches, then proceed to get the NB voltage to as close to 1.12 as possible ? -- I read a guide that said to put the NB voltage on 1.12 and not lowest since P5Q mobo’s have weird bug with being set on lowest setting , so always best to one above. (lowest is 1.10)

2. After I do get the Vcore and the NB voltage to the ‘perfect stable’ settings, do I want to [Enable] any of the features that are currently [Disabled] ?

Below are some screenshots (pictures) of CPUZ/RealTemp/HWMonitor etc for the settings below.








Ai Tweaker (tab)

Ai Overclock Tuner .............................. [Manual]
CPU Ratio Setting ................................ [09.5]
FSB Frequency .................................... [400]
PCIE Frequency ................................... [100]
FSB Strap to North Bridge ..................... [Auto]
DRAM Frequency ................................. [DDR2-801MHz]
DRAM CLK Skew on Channel A1........... [Auto]
DRAM CLK Skew on Channel A2........... [Auto]
DRAM CLK Skew on Channel B1........... [Auto]
DRAM CLK Skew on Channel B2........... [Auto]
DRAM Timing Control............................ [Manual]
*** 1st Information : 4-4-4-12-3-52-6-3
CAS# Latency............................... [4 DRAM Clocks]
DRAM RAS# to CAS# Delay........... [4 DRAM Clocks]
DRAM RAS# Precharge.................. [4 DRAM Clocks]
DRAM RAS# Activate to Precha...... [12 DRAM Clocks]
RAS# to RAS# Delay...................... [Auto]
Row Refresh Cycle Time................. [Auto]
Write Recovery Time...................... [Auto]
Read to Precharge Time................ [Auto]
*** 2nd Information : 8-3-5-4-6-4-7
READ to WRITE Delay (S/D)........... [Auto]
Write to Read Delay (S)................. [Auto]
WRITE to READ Delay (D).............. [Auto]
READ to READ Delay (S)................. [Auto]
READ to READ Delay (D)................ [Auto]
WRITE to WRITE Delay (S)............. [Auto]
WRITE to WRITE Delay (D)............ [Auto]
*** 3rd Information : 13-5-1-5-5
WRITE to PRE Delay...................... [Auto]
READ to PRE Delay........................ [Auto]
PRE to PRE Delay.......................... [Auto]
ALL PRE to ACT Delay.................... [Auto]
ALL PRE TO REF Delay................... [Auto]
DRAM Static Read Control..................... [Auto]
DRAM Read Training.............................. [Auto]
MEM. OC Charger.................................. [Auto]
Ai Clock Twister..................................... [Auto]
Ai Transaction Booster.......................... [Auto]
*** C/P : A1 A2 A3 A4 | B1 B2 B3 B4
*** LVL : 12 12 12 12 | 12 12 12 12

******** Please key in numbers directly! ********
CPU Voltage.......................................... [1.30000]
CPU GTL Voltage Reference (0/2).......... [Auto]
CPU GTL Voltage Reference (1/3).......... [Auto]
CPU PLL Voltage.................................... [1.52]
FSB Termination Voltage........................ [1.12]
DRAM Voltage........................................ [2.10]
NB Voltage............................................. [1.20]
NB GTL Reference.................................. [Auto]
SB Voltage............................................. [Auto]
PCIE SATA Voltage................................. [Auto]
*************************************************
Load-Line Calibration............................ [Enabled]
CPU Spread Spectrum........................... [Disabled]
PCIE Spread Spectrum.......................... [Disabled]
CPU Clock Skew.................................... [Auto]
NB Clock Skew....................................... [Auto]
CPU Margin Enhancement..................... [Performance Mode]


Advanced (tab)

Configure advanced CPU settings
-----------------------------------------------
CPU Ratio Setting................................. [09.5]
C1E Support......................................... [Disabled]
Max CPUID Value Limit......................... [Disabled]
Intel(R) Virtualization Tech................... [Disabled]
CPU TM Function.................................. [Disabled]
Execute Disable Bit.............................. [Disabled]


Final Note - Sorry about the wierd look, it looks great on Word 2007, i guess the dots and spaces dont convert to the forums very well =(

More about : pro confirm settings

March 18, 2009 4:05:31 PM


Might be worth manually setting you FSB strap to a setting that gives 800Mhz RAM (probably 333MHz????). Also increase your RAM timings to 5-5-5-15 until you get stable, that should allow for a little 'margin of error' in your overclock.

Also your CPU PLL voltage looks too high. Start by keeping it at its minimum setting - having too high a PLL voltage is a very quick way to fry a processor.

Other than that it's looking good (not that I'm a pro!!). Big jump for a first OC though. Good luck!!
March 18, 2009 5:21:40 PM

Fruity said:
Might be worth manually setting you FSB strap to a setting that gives 800Mhz RAM (probably 333MHz????). Also increase your RAM timings to 5-5-5-15 until you get stable, that should allow for a little 'margin of error' in your overclock.

Also your CPU PLL voltage looks too high. Start by keeping it at its minimum setting - having too high a PLL voltage is a very quick way to fry a processor.

Other than that it's looking good (not that I'm a pro!!). Big jump for a first OC though. Good luck!!


I'm stable now, or i should say i was at 1.3000 Vcore, i took the vcore down a few notches but i havnt done a prolonged stress test yet. Havn't had any issues with the memory yet, plus i think it should be fine since its the manufacturer settings, or EPP.

The CPU PLL voltage ranges from (1.50 - 2.78)

i have it set to 1.52 because i read that there is a minor issue with having voltage settings on the lowest setting, so to increase it one above the lowest.

The manual shows this



I'll look into the FSB Strap to see if it will give me the 800MHz instead of 801MHz. i'm assuming it will be either 333 or 400

Thanks for the input =)
Related resources
March 19, 2009 5:58:23 PM

Well after several days of trying different voltages to find my stable Vcore i finally got it ! WOOT

Bios Vcore set to 1.2500

CPUZ Reading
Idle - 1.2240
Load - 1.2000

The second i go below that mark i get errors in Prime95 testing after about 5-10 minutes.

I ran 1.2500 Vcore for about 6 hours and did full blend, passed with flying colors woot =)

Temperatures idle are 25-26ºC , load at 38-43º (mostly 41)

Now im just gunna bump it up 2 increments and then start to lower the NB Voltage and see how that handles

Things i changed

CPU Voltage.......................................... [1.25000]
FSB Strap to North Bridge ..................... [400]
DRAM Frequency ................................. [DDR2-800MHz]
Load-Line Calibration............................ [Disabled]
March 19, 2009 11:23:15 PM

:D  Nice :D 
!