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Overclocking Advice

post #1 of 9
Thread Starter 
Apologies if this has been asked before, I’m getting a bit bogged down with information overload after reading so many threads on the subject of overclocking.

I’ve hit a bit of a limit at 420FSB CPU multi 9. I've got a lot of my BIOS settings at Auto as I'm new to this overclocking game, I know I need to start setting voltages manually to get stability and that I need to get it to the highest stable FSB, then take it a little bit more, then increase the Vcore a little bit and see if it makes it stable and then repeat until I’m running where I want to be, but how do I know what Vcore voltage to use?

If I look at Everest results currently it reports CPU voltage at 1.368v when the setting for Vcore in my BIOS is set at auto, should I use this as a starting point?

And what about my NB voltage, what should I use as a starting point, should I do the same thing and use the Everest reported NB voltage as a starting point and work upwards from there?

Below I’ve listed my current Extreme Tweaker settings; at these settings I can boot to Vista no problem and I'm stable in Prime95 for at least 6 hours with good temperatures and have a 3DMark06 score of 15241, I'm pretty sure I can push this system a bit further but need a bit of guidance so I don't fry my components.

I currently have my graphics card overclocked; GPU clock from 650 to 675MHz and GPU memory clock from 1100 to 1134MHz.

Can anybody help and give some advice on some additional manual settings to point me in the right direction to get me off on a good starting point.

BIOS 0602
Extreme Tweaker
Ai Overclock Tuner : Manual
CPU Ratio Control : Manual
- Ratio CMOS Setting : 9
FSB Frequency :420
FSB Strap to North Bridge :AUTO
PCI-E Frequency: 100
DRAM Frequency: AUTO
DRAM Command Rate : AUTO
DRAM Timing Control: AUTO
CAS# Latency : AUTO
RAS# to CAS# Delay : AUTO
RAS# Precharge : AUTO
RAS# ActivateTime : AUTO
RAS# to RAS# Delay : AUTO
Row Refresh Cycle Time : AUTO
Write Recovery Time : AUTO
Read to Precharge Time : AUTO

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
DRAM Static Read Control: AUTO
Ai Clock Twister : AUTO
Transaction Booster : AUTO

CPU Voltage : AUTO
CPU PLL Voltage : AUTO
North Bridge Voltage : AUTO
DRAM Voltage : AUTO
FSB Termination Voltage : AUTO
South Bridge Voltage : AUTO
Loadline Calibration : ENABLED
CPU GTL Reference : AUTO
North Bridge GTL Reference : AUTO
DDR2 Channel A REF Voltage : AUTO
DDR2 Channel B REF Voltage : AUTO
DDR2 Controller REF Voltage : AUTO
SB 1.5V Voltage : AUTO

NB LED Selection : NB Volt
SB LED Selection : SB Volt
CPU LED Selection : CPU VOlt
Voltiminder LED : ENABLED

CPU Spread Spectrum : Disabled
PCIE Spread Spectrum : Disabled

LL
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post #2 of 9
try v-c at 1.375 at 3.7 that a decent o/c,ya dont leave v-c in auto,just watch temps with core temp,stay under 65c
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post #3 of 9
Thread Starter 
Thanks, but isn’t 1.37v and 65c higher than what Intel recommend for the voltage range and temp limit of this processor as per the sample taken from the spec sheet below?

I’m assuming it’s OK to over-volt as long as the temps don’t go too high. I’m beginning to think I need to invest in some water cooling.

Intel® Core™2 Extreme Processor QX9650

Package Type: LGA775
Manufacturing Technology: 45 nm
Core Stepping: C0
CPUID String: 10676h
Thermal Design Power: 130W
Thermal Specification: 64.5°C
VID Voltage Range: 0.85V – 1.3625V
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post #4 of 9
Thread Starter 
Quote:
Originally Posted by phillipjos View Post
try v-c at 1.375 at 3.7 that a decent o/c,ya dont leave v-c in auto,just watch temps with core temp,stay under 65c
Should I stick to the voltage and temperature limits specified by intel (I'm a bit of a noob so need some help)?

Package Type: LGA775
Manufacturing Technology: 45 nm
Core Stepping: C0
CPUID String: 10676h
Thermal Design Power: 130W
Thermal Specification: 64.5°C
VID Voltage Range: 0.85V – 1.3625V
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post #5 of 9
First you should upgrade your cooler to a Thermalright Ultra Extreme.

There is a C1 stepping Qx9650 out now but it is not available on the open market yet. It is supposed to clock higher within the voltage specs. While these 45nm monsters will overclock to the moon, they are limited by voltage. Hopefully further revisions will correct this issue.

Have you tried higher multipliers? 10/11/12 etc? Does bumping your multi greatly affect the voltage you have to pump into the CPU?
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post #6 of 9
Thread Starter 
Doesn't increasing the multi mean that I'll have to use a lower FSB, I thought it would be better to have a higher FSB, isn't this the data transfer bus that carries information between the CPU and the northbridge of the Motherboard, wouldn’t I be creating a bottleneck with a lower FSB.

Going back to the voltages; in my original post I said that I’d hit a bit of a limit at 420FSB CPU multi 9. Now I know I need to start setting voltages manually to get stability by increasing the Vcore but how do I know what Vcore voltage to use, where do I start? With settings at auto CPU voltage is 1.368v, should I use this as a starting point? And do I do the same for the NB voltage?
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post #7 of 9
Thread Starter 
Quote:
Originally Posted by phillipjos View Post
try v-c at 1.375 at 3.7 that a decent o/c,ya dont leave v-c in auto,just watch temps with core temp,stay under 65c
Are you saying that my o/c is already OK or is there room to push it a bit more, i.e. set vcore to 1.375 and push the FSB up a bit. My temps seem OK at the moment, under load playing Crysis and when I've been running Prime95, I'm getting about 47c. It's the GPU temps that worry me, this goes up to about 67c
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post #8 of 9
BTW, those are great GPU temps! The max is 100°C. On stock cooling, the best I could get with my 8800GTS was 76°C at stock clocks.

Please dont go over 1.36v vcore.

Here are some posts on the vcore issue on these 45nm CPUs:

E8400 OC attempt

Help With E8400

Tricky's thread on his E8400 with 1.40v vcore

OC benches for E8400

Note with the CPU, you can raise the multi to take some load off the northbridge and the ram.

Quote:
Extreme Tweaker
Ai Overclock Tuner : Manual
OC From CPU Level Up : AUTO
CPU Ratio Control : Manual
- Ratio CMOS Setting : 9
FSB Frequency : 425
FSB Strap to North Bridge : Auto
PCI-E Frequency: 100
DRAM Frequency: whatever keeps you close to your max ram speeds
DRAM Command Rate : 2T
DRAM Timing Control: Manual
CAS# Latency : 5
RAS# to CAS# Delay : 5
RAS# Precharge : 5
RAS# ActivateTime : 15
RAS# to RAS# Delay : AUTO
Row Refresh Cycle Time : AUTO
Write Recovery Time : AUTO
Read to Precharge Time : AUTO

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
DRAM Static Read Control: Disabled
Ai Clock Twister : Strong
Transaction Booster : disabled
Relax level: auto

CPU Voltage : 1.35
CPU PLL Voltage : AUTO
North Bridge Voltage : 1.45 (lower may be stable)
DRAM Voltage : 2.1
FSB Termination Voltage : 1.40
South Bridge Voltage : auto
Loadline Calibration : Enabled
CPU GTL Reference : 0.63X
North Bridge GTL Reference : 0.67X
DDR2 Channel A REF Voltage : AUTO
DDR2 Channel B REF Voltage : AUTO
DDR2 Controller REF Voltage : AUTO
SB 1.5V Voltage : AUTO
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post #9 of 9
Thread Starter 
Quote:
Originally Posted by ericeod View Post
BTW, those are great GPU temps! The max is 100°C. On stock cooling, the best I could get with my 8800GTS was 76°C at stock clocks.

Please dont go over 1.36v vcore.
Thanks ericeod I'm gonna try setting my Vcore to manual at 1.36v and see what stability I get and then have a go at changing the FSB and multi as you suggest, I'll post my results once I've done some testing.

On the subject of my GPU temp, this could be because I have the system setup on a test bench with a 120mm fan blowing directly onto the gfx card.

I don't think I'll get good temps like this once I transfer everything into my Lian-Li V1000 case. However, I have got hold of three Scythe Kaze-yuni 1900rpm fans two to replace the stock case fans and one to stick in the top of the case.
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