E8400 max overclock?

I always think it just depends on the chip and a bit of luck.

I got my E8400 to 3.85ghz and that seemed to be the max it'd do.

Yet my E8500 (which i believe was actually once gurusan's, i got it 3rd hand i think!) sits at 4.4ghz with a £10 custom air cooler all day long with no probs at pretty low volts.
 
It is a C0, just done a CPU-Z on it, going to have a play now with overclocking...

e8400cpuz.jpg
 
Nice clock gurusan, especially at that vcore, thats where the new revision certainly helps on the vcore.

If only i could use faster ram on my board, ahwell no more spending on this setup, next upgrades = newer set up so new everything.
 
Not having the best of luck here fella's, 3.6ghz was a breeze at good temps and voltage but 4ghz is being a git! It wouldn't even boot until it had 1.37v core!

I'm running 9x445,
1.4250v in bios (CPU-Z seeing it as 1.400v)
1.55v NB voltage
Auto SB voltage (I tried 1.05v but made no difference)
Memory set to 1:1 = DDR2-891mhz (timings and voltage set for make/model ram)
Load-Line Calibration = Enabled
CPU Spread Spectrum = Disabled
C1E Support = Disabled
Everything else on Auto

I know temps are a bit high but the heatsink is only a Arctic Cooling Freezer 7 pro which I will change at somepoint, its stable Prime95 doing small FFTs for half hour with low 60's temps but when I cracked it on LinX it bumps temps to 70 degrees as per screenshot below and fails on its second run.

Im now a bit worried about going past 1.4275v in bios :(

e8400cpuz2.jpg
 
Try 1.32V for FSB termination. Don't go over 1.4V.

CPU PLL I usually try to keep below 1.6, try 1.54ish or so
 
gurusan said:
Try 1.32V for FSB termination. Don't go over 1.4V.

CPU PLL I usually try to keep below 1.6, try 1.54ish or so
Click to expand...

Can't be so precise on the voltages on this P5K board, goes up in .10's so I set:

CPU PLL Voltage = 1.60v
FSB Termination Voltage = 1.30v

and same thing, 2nd LinX run = fail! :(
 
Can you fill in this template with your current settings?

AI Overclocking: Manual
CPU Ratio Control: Manual
- Ratio CMOS Setting: 9
FSB Frequency: 266
PCI-E Frequency: 100
DRAM Frequency: AUTO (at 266FSB defaults to 2:3 for AUTO)
DRAM Timing Control: Manual
CAS# Latency: 4
RAS# to CAS# Delay: 4
RAS# Precharge: 4
RAS# Activate to Precharge: 12
TWR: AUTO
TRFC: AUTO
TWTR: AUTO
TRRD: AUTO
TRTP: AUTO
DRAM Static Read Control: Disabled

Transaction Booster: AUTO
Boost Level: (only displayes when Transaction Booster is set to Disable or Enabled)
Clock Over-Charging Mode: AUTO

CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled

CPU Voltage: AUTO
CPU Voltage Reference: AUTO
CPU Voltage Damper: AUTO
CPU PLL Voltage: AUTO
DRAM Voltage: 2.10
FSB Termination Voltage: AUTO
North Bridge Voltage: AUTO
North Bridge Voltage Reference: AUTO
South Bridge Voltage: AUTO
Click to expand...
 
Right think ive found the sweet spot now, needed a bit more core voltage which now stands at 1.450v in the Bios and in CPU-Z = 1.424v.

Has happily ran 15 mins and 10 passes on LinX now but temps are 72 degrees, what do you think? I will stress it longer of those temps are OK :)

e8400cpuz3.jpg


Here ya go anyway:

AI Overclocking: Manual
CPU Ratio Control: 9
FSB Frequency: 445
PCI-E Frequency: 100
DRAM Frequency: 1:1
DRAM Timing Control: Manual
CAS# Latency: 5
RAS# to CAS# Delay: 5
RAS# Precharge: 5
RAS# Activate to Precharge: 15
TWR: AUTO
TRFC: AUTO
TWTR: AUTO
TRRD: AUTO
TRTP: AUTO
DRAM Static Read Control: Disabled

Transaction Booster: Disabled
Boost Level: Disabled
Clock Over-Charging Mode: AUTO

CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled

CPU Voltage: 1.450
CPU Voltage Reference: AUTO (NOT GOT THIS ON P5K)
CPU Voltage Damper: AUTO (NOT GOT THIS ON P5K)
CPU PLL Voltage: 1.60
DRAM Voltage: 2.10
FSB Termination Voltage: 1.30
North Bridge Voltage: 1.55
North Bridge Voltage Reference: (NOT GOT THIS ON P5K)
South Bridge Voltage: AUTO
 
You really should'nt need that vcore for 4ghz, if u check my screen shot earlier, both being C0's, gurusan seems to know your mobo bios better then me, so i'll let him help you with the tweaks.
 
ah, lack of CPU reference might be what's limiting you, the P35 chipset is not ideal for wolfdales.

In my opinion 1.424V is ok and your temps look great.
 
bifday2k said:
You really should'nt need that vcore for 4ghz, if u check my screen shot earlier, both being C0's, gurusan seems to know your mobo bios better then me, so i'll let him help you with the tweaks.
Click to expand...

I had a P5K Deluxe, but ages ago and never clocked a wolfdale on it. From what I've seen on the net they need a bit more VTT and vcore
 
mmm well my mobo is a msi p35, i know i had to mess with Vtt volts to get it working properly, maybe thats what he has instead of cpu ref, as each manufacture uses different terms.

think my Vtt was like 1.3 for that clock in my post earlier, was'nt that high to be honest, vcore also as u can see in the same pic, just abit more then the E0's really.
 
Excellent, thanks very much for you're help Gurusan, I have got a P5Q with the P45 chipset which might be better for this Wolfdale but its happily running a Q6600 @ 3.4 at the mo so im not going to disturb it!

Will have more of a fiddle with it but that looks like its going to be the sweet spot on this particular CPU and board :)
 
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