Advice Sought getting E8400 from 3.8Ghz to 4Ghz

jwhalley

jwhalley

jwhalley

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Joined
26 Jun 2007
Posts
185
Hi guys, I've had the following setup for a few months now

E8400 with Tuniq Tower Cooler
Asus P5K-E Wifi-AP Edition
OCZ 4GB (2x2GB) PC2-8000C5 1000MHz ReaperX HPC Enhanced Bandwidth Edition Dual Channel DDR2

I've had it running at a nice 3.8Ghz after adjusting the following settings in the bios based on information on these forums:-

FsB: 423
PICE Freq: 100
Dram Freq: 847 5-5-5-15 2.1v
VCore: 1.4 (resulting in 1.375v idle, 1.368 load)
CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled
Load Line Calibration: Enabled
C1E Support: Disabled
Intel Speedstep: Disabled

Now I would like to hit the 4Ghz mark (seems like a round number). However, when I try to raise the FsB to 445 it becomes unstable. I've even raised the VCore to 1.45 (resulting in idle of 1.425v) but it still stays unstable. And being a 45nm I really dont want to go any higher than I already have.

I'm also fairly certain its not due to the motherboard/memory as it is stable when I lower the multiplyer to 450x8.

Do you have any suggestions how I might be able to hit 4Ghz (if possible). I've noticed the following options are set to 'Auto' at the moment, but my knowledge of their effect on the stability of the CPU is next to none:-

CPU PLL Voltage
FSB Termination Voltage
NB Voltage
SB Voltage
Clock Over-Charging Voltage
CPU GTL Voltage Reference
NB GTL Voltage Reference

Any help/suggestions would be greatly appreciated
 
jwhalley said:
Hi guys, I've had the following setup for a few months now

E8400 with Tuniq Tower Cooler
Asus P5K-E Wifi-AP Edition
OCZ 4GB (2x2GB) PC2-8000C5 1000MHz ReaperX HPC Enhanced Bandwidth Edition Dual Channel DDR2

I've had it running at a nice 3.8Ghz after adjusting the following settings in the bios based on information on these forums:-

FsB: 423
PICE Freq: 100
Dram Freq: 847 5-5-5-15 2.1v
VCore: 1.4 (resulting in 1.375v idle, 1.368 load)
CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled
Load Line Calibration: Enabled
C1E Support: Disabled
Intel Speedstep: Disabled

Now I would like to hit the 4Ghz mark (seems like a round number). However, when I try to raise the FsB to 445 it becomes unstable. I've even raised the VCore to 1.45 (resulting in idle of 1.425v) but it still stays unstable. And being a 45nm I really dont want to go any higher than I already have.

I'm also fairly certain its not due to the motherboard/memory as it is stable when I lower the multiplyer to 450x8.

Do you have any suggestions how I might be able to hit 4Ghz (if possible). I've noticed the following options are set to 'Auto' at the moment, but my knowledge of their effect on the stability of the CPU is next to none:-

CPU PLL Voltage
FSB Termination Voltage
NB Voltage
SB Voltage
Clock Over-Charging Voltage
CPU GTL Voltage Reference
NB GTL Voltage Reference

Any help/suggestions would be greatly appreciated
Click to expand...

I had this setup at 4.37ghz stable so 4ghz should be quite easy. Try raising NB voltage to 1.45v and FSB termination to 1.3v. You can leave GTL voltages at auto as these are only really useful for quads.
 
Off the top of my head:

PLL upto around 1.7 should be plenty
FSB TV up a notch
NB up to around 1.5v
SB up a notch
GTL's at x.63
 
Thanks for the tips. I tried

FSB 1.425 (1.4v idle)
CPU PLL 1.5-->1.7
FSB TV 1.3-->1.3
NB 1.25-->1.55 (no option for 1.45 or 1.5)
SB 1.05-->1.2
CPU GTL 0.63x & Auto (tried both)
NB GTL 0.61x & Auto (tried both, and there was no 0.63x option)

Unfortunately Prime failed almost immediately upping FSB from 423 to 445

Could I just be unlucky with the chip I have?
 
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