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E8400 Overclocking

post #1 of 24
Thread Starter 
I'm trying to get to 4.0GHz stable on this CPU and I know it can be done I'm just having some difficulty truly understanding these BIOS settings. I'm a novice at this stuff and don't fully understand what is best to tweak to get the best performance output. What are the main things to know when overclocking? Is a high RAM speed worth it as well?

Asus Rampage Formula 0803 BIOS


Ai Overclock Tuner [Manual]
OCfrom CPU level up [Auto]
CPU Ratio Setting [9.0]
FSB Strap to Northbridge [266MHz]
FSB Frequency [425]
PCIE Frequency [100]

DRAM Frequency [DDR2 - 1066MHz]
DRAM Command Rate [Auto]
RAM Timings [5-5-5-15]
DRAM Static Read Control [Enable]
Ai Clock Twister [Auto]
Ai Transaction Booster [Manual]
Common Performance Level [8.0]

CPU Voltage [1.35v]
CPU PLL Voltage [1.54v]
North Bridge Voltage [1.43v]
DRAM Voltage [2.00v]
FSB Termination Voltage [1.26v]
South Bridge [Auto]
SB 1.5v Voltage [Auto]
Loadline Calibration [Disabled]
GPU GTL Voltage Reference [0.63x]
NB GTL Voltage Reference [0.67x]

CPU Spread Spectrum [Disabled]
PCIE Spread Spectrum [Auto]
CPU Clock Skew [Auto]
NB Clock Skew [Auto]

Hardware Monitor


CPU Voltage [1.304v] [CPU-z reads 1.320v]
CPU PLL Voltage [1.648v]
FSB Termination Voltage [1.184v[
DRAM Voltage [2.096v]
North Bridge Voltage [1.456v]
South Bridge Voltage [1.072v]
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post #2 of 24
I dont know if 4.0 Ghz is a guarantee, because my current E8400 cant even get to 3.6 Stable with 1.37v. But my first E8400 that i had was really nice OCed to about 4.4 on 1.32v(too bad it passed away) So the basics are FSB Frequency, Multiplier which is 9 for the E8400, and the Vcore(cpu voltage) keep the vcore under 1.38V and make sure that the temps are under 70C
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post #3 of 24
j/w why is keeping it under 1.37v a must?
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post #4 of 24
Quote:
Originally Posted by mannyfc View Post
j/w why is keeping it under 1.37v a must?
Voltage can degrade the chip, 1.3625 is the max recommended spec for the 45nm dual cores . Also I have the same board so i'll try to help you out. You have great settings so far for ballparking. Processor speed > Ram speed imo. Ram is secondary in stabliizing a system.

Your gtl for cpu might do a bit better at .65, it's the magic number for us also make sure you don't screw with ram till you know the chip is stable. I know my chip can do 4.16 but only with 1.3625 voltage (with llc and inside of windows :\\) Otherwise I just leave it at 4 and drop the voltage a bit.

EDIT, manny holy CRAP. that's an insane overclock but I don't think your chip will last long at that voltage. LOL.
Edited by chevymeister - 1/23/11 at 11:18pm
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post #5 of 24
Just checked my bios, try putting fsb to 445 (I have pc6400 ram so it might be different for me) (you might have an fsb hole, just a possibility why you can't go higher) and go to 333mhz strap, I think with your ram you'll see 1069mhz or something along those lines. Select that then fine tune the ram after (set most settings to default except for voltage and disable stuff like static read control, loosen performance level, until you can get it stable ) hope this helps.
Edited by chevymeister - 1/23/11 at 11:19pm
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post #6 of 24
Thread Starter 
Quote:
Originally Posted by chevymeister View Post
Just checked my bios, try putting fsb to 445 (I have pc6400 ram so it might be different for me) (you might have an fsb hole, just a possibility why you can't go higher) and go to 333mhz strap, I think with your ram you'll see 1069mhz or something along those lines. Select that then fine tune the ram after (set most settings to default except for voltage and disable stuff like static read control, loosen performance level, until you can get it stable ) hope this helps.
I also have pc6400 ram. Might downclock the ram since its 2nd to cpu speed.
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post #7 of 24
Quote:
Originally Posted by chevymeister View Post
Voltage can degrade the chip, 1.3625 is the max recommended spec for the 45nm dual cores . Also I have the same board so i'll try to help you out. You have great settings so far for ballparking. Processor speed > Ram speed imo. Ram is secondary in stabliizing a system.

Your gtl for cpu might do a bit better at .65, it's the magic number for us also make sure you don't screw with ram till you know the chip is stable. I know my chip can do 4.16 but only with 1.3625 voltage (with llc and inside of windows :\\) Otherwise I just leave it at 4 and drop the voltage a bit.

EDIT, manny holy CRAP. that's an insane overclock but I don't think your chip will last long at that voltage. LOL.
my chip only only runs that on a slushbox, right now at a simple
400 mhz fsb x 10 4ghz@ 1.368v on an H50 and 500 mhz 5-5-5-15 ram..

i think its safe to say the diff in 1.36 and lets say 1.38 ... is minute... depending on temps of course
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post #8 of 24
Quote:
Originally Posted by Vitaminx View Post
I also have pc6400 ram. Might downclock the ram since its 2nd to cpu speed.
And you have it at 1066?! That could be why you are not stable!!

Try keeping the strap at auto, just set your ddr speed as close to 800 as possible. Right now I have 445 fsb and my ram speed is 890mhz. A litt e more to the ram and I am unstable.

Tell me how your endeavor goes.

Quote:
Originally Posted by mannyfc View Post
my chip only only runs that on a slushbox, right now at a simple
400 mhz fsb x 10 4ghz@ 1.368v on an H50 and 500 mhz 5-5-5-15 ram..

i think its safe to say the diff in 1.36 and lets say 1.38 ... is minute... depending on temps of course
Agreed, but is in that windows or bios? There's always usually SOME drop so it's safe to say you aren't going over
Edited by chevymeister - 1/24/11 at 8:50am
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post #9 of 24
You need some 1066 to properly overclock these chips. You'll be going well over 400FSB and it's most likely RAM fail. I don't think you can down-clock it enough to get it in spec, not on any board I've seen anyway.

As far as voltage goes, many feel that 1.4 is fine with proper cooling, but 1.37-ish is probably a safer bet. I bet you don't need more voltage though, once you get your RAM sorted. Just don't goose the VTT, that's been linked to killing chips over 1.4.

If you still have instability with 1066, we'll have to have the LLC debate.
Edited by 2thAche - 1/24/11 at 8:53am
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post #10 of 24
Quote:
Originally Posted by chevymeister View Post
Agreed, but is in that windows or bios? There's always usually SOME drop so it's safe to say you aren't going over


http://hwbot.org/community/submissio...66ghz_4812_mhz
real easy,
5000mhz flat in bios but cooler needs dice in the box

more voltage on memory maybe?

edit: matched ram for ease
Edited by mannyfc - 1/24/11 at 1:36pm
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