**Official e8400/e8500 Retail OC Thread

[laragirl83]

I have to run 1.38 volts to hit 4.1ghz on my E8500 C0

Thats a weak one, u got there

[Leeghoofd]

Currently burning in my new Q828A434 VID is 1.25

Does 8 x 500 with 1.215 volts under load (didn't try lower yet), PLL 1.54 and FSB term at 1.18 once it passes 8 hours I'll post a screenshot otherwise not worth it ofcourse

OCCT 2hour test done on a P5Q Dlx with LLC off

Keep you posted

[jaredpace]

did you guys notice the E0's have a higher thermal limit? Looks like more room for oc'ing and higher temps.


Intel® Core™2 Duo Desktop Processor E8400
Processor Specifications:

sSpec Number:SLAPL
CPU Speed:3 GHz
PCG:06
Bus Speed:1333 MHz
Bus/Core Ratio:9
L2 Cache Size:6 MB
L2 Cache Speed:3 GHz
Package Type:LGA775
Manufacturing Technology:45 nm
Core Stepping:C0
CPUID String:10676h
Thermal Design Power:65W
Thermal Specification:72.4°C
VID Voltage Range:0.85V – 1.3625V



Intel® Core™2 Duo Desktop Processor E8400
Processor Specifications:

sSpec Number:SLB9J
CPU Speed:3 GHz
PCG:06
Bus Speed:1333 MHz
Bus/Core Ratio:9
L2 Cache Size:6 MB
L2 Cache Speed:3 GHz
Package Type:LGA775
Manufacturing Technology:45 nm
Core Stepping:E0
CPUID String:1067Ah
Thermal Design Power:65W
Thermal Specification:74.1°C
VID Voltage Range:0.85V – 1.3625V

[misho]

OK Hey guys so after messing around here is what i got:

So at 442x9.5 = 4.2Ghz my stable settings:
CPU:1.376V
NB/SB Voltage: 1.200V
DDR2: 2.096V
FSB: 1.200
CPU PLL Voltage 1.6V

But I tried doing 453x9.5 (4.3Ghz) and orthos fails me in first seconds, pc reboots, really unstable:

Now my question is:
what Can I do to make it stable at 4.3Ghz WITHOUT increasing the vcore because it goes above 1.4V?
Maybe increase the other voltages? Memory settings? etc
Also what are the max safe ranges for the other voltages on the mobo?
BTW Mobo is tpower I45
Edit I turned the vcore one more notch up (1.425) and it was still unstable at 4.3Ghz... I hope I didn't reach the limit

[JCGhz]

misho my C0 8400 maxed out @4.2 also... its a good overclock. Better than being stuck @4ghz with the same voltage like some others.

[bigwill68]

misho my C0 8400 maxed out @4.2 also... its a good overclock. Better than being stuck @4ghz with the same voltage like some others.

I thought you had a EO not CO? still waiting on that batch #

[JCGhz]

I thought you had a EO not CO? still waiting on that batch #

Ive had a 8400C0,E0 an 8500C0 and an 8600 E0 of course..I currently only have E0's 8400 and 8600 using the one in this thread.. btw batch code is in my first post with my e8400@4050 in this thread.

anyway its an Q820A844 pack date 8/5/08

[misho]

OK Hey guys so after messing around here is what i got:

So at 442x9.5 = 4.2Ghz my stable settings:
CPU:1.376V
NB/SB Voltage: 1.200V
DDR2: 2.096V
FSB: 1.200
CPU PLL Voltage 1.6V

But I tried doing 453x9.5 (4.3Ghz) and orthos fails me in first seconds, pc reboots, really unstable:

Now my question is:
what Can I do to make it stable at 4.3Ghz WITHOUT increasing the vcore because it goes above 1.4V?
Maybe increase the other voltages? Memory settings? etc
Also what are the max safe ranges for the other voltages on the mobo?
BTW Mobo is tpower I45
Edit I turned the vcore one more notch up (1.425) and it was still unstable at 4.3Ghz... I hope I didn't reach the limit

^^^ So what do you think is limiting me here? What should I try increasing (other than vcore) and to what safe levels

[OCX600RR]

Finally put my new system together today and i'm pretty shocked lol. As some of you might have read my Sunbeam CCF didn't fit on the EP45-UD3P so I'm using a stock Intel cooler at the moment, the ones Intel shipped with the 65nm Conroes which are like 3 times beefier than the new 45nm coolers Intel ships with their chips.

Anyway, decided to see what I could achieve on the stock cooler and wow, pretty amazed haha. Not done yet!!

E8400 E0 Batch #Q825A652
EP45-UD3P F4 BIOS
4GB Mushkin DDR2-800 @ 1000MHz 5-5-5-15 2.0v

[AzN_plyR]

No time to try and go higher, but will do later after I get tired of FC2

[misho]

damnit how do I get past 4.2Ghz without increasing the vcore ?

[LagunaX]

damnit how do I get past 4.2Ghz without increasing the vcore ?

Try bumping up your northbridge.

On my asus p5k vanilla it tkaes 1.4v for 4.2ghz on an old C0 e8400.
On my DS3L it takes more than 1.2v also - 1.3v I think but can't remember.

Anyways try 1.4v and then see if you can drop it from there to 1.3 or 1.25v.

[misho]

Try bumping up your northbridge.

On my asus p5k vanilla it tkaes 1.4v for 4.2ghz on an old C0 e8400.
On my DS3L it takes more than 1.2v also - 1.3v I think but can't remember.

Anyways try 1.4v and then see if you can drop it from there to 1.3 or 1.25v.

OK will try that right now. I also ran memtest86 and it passes all tests just for heads up...

**EDIT**
OK so I bumped up the NB voltage to 1.376V (this was in the red settings now-kinda got scared) and same problems happen. orthos fails etc, and now i am getting VPU recovery sometimes too. (so i think 2 much voltage for the bridges)..
wwhat can I do now...

[HDCHOPPER]

ok just got 3 more E 8400 from fry's weekend sale

all are batch Q818's any good ????

the 1 in my hans atm is a Q818A695... SLAPL

wayyyy too many post here to search them all

[misho]

ok just got 3 more E 8400 from fry's weekend sale

all are batch Q818's any good ????

the 1 in my hans atm is a Q818A695... SLAPL

wayyyy too many post here to search them all

Well I have E8500 C0 q818A and it looks like I am getting a limit at 4.2Ghz with 1.376vcore.... but I still need some help testing for higher speeds without increasing vcore

[HDCHOPPER]

well heck thats average
love cherry picking but eye need better batch numbers to find the golden ones
thanks

[DOM.]

ok just got 3 more E 8400 from fry's weekend sale

all are batch Q818's any good ????

the 1 in my hans atm is a Q818A695... SLAPL

wayyyy too many post here to search them all

SLAPL is C0

got my E8500 E0 today still looking to get a 24/7 clock did pi at 9.5X500 1.47

[misho]

SLAPL is C0

got my E8500 E0 today still looking to get a 24/7 clock did pi at 9.5X500 1.47

At 1.47V a 24/7 clock is not safe lol. Try under 1.39V or something

[DOM.]

At 1.47V a 24/7 clock is not safe lol. Try under 1.39V or something

naw it was just for benching test

i was just going to ask what is safe for 24/7 1.35 or 1.4 or 1.45 ive seen alot of different opinions

[misho]

naw it was just for benching test

i was just going to ask what is safe for 24/7 1.35 or 1.4 or 1.45 ive seen alot of different opinions

after a lot of reading ppl say under 1.4V is safe. So like 1.38 and lower is good. That is what I currently have but trying to get past 4.2Ghz without increasing the cpu vcore.
you got any ideas lol?

[DOM.]

is 1.296v at 4275Mhz any good ?

this is on a Asus P5B Dlx

[misho]

is 1.296v at 4275Mhz any good ?

this is on a Asus P5B Dlx

yea that is awesome!!

you are lucky u got a nice chip unlike me

[DOM.]

yea that is awesome!!

you are lucky u got a nice chip unlike me

well i made sure to find out what i was getting they still had a hand full left at http://www.centralcomputers.com/index.htm they got where you can IM them and they checked the sSpec Numbers to make sure it was a E0 and also gave me the Q822A537 Pack Date 8/7/07 there others are the same they have left its a lil more then newegg but they couldnt find out and i didnt wanna take that 50/50 chance

[LagunaX]

well i made sure to find out what i was getting they still had a hand full left at http://www.centralcomputers.com/index.htm they got where you can IM them and they checked the sSpec Numbers to make sure it was a E0 and also gave me the Q822A537 Pack Date 8/7/07 there others are the same they have left its a lil more then newegg but they couldnt find out and i didnt wanna take that 50/50 chance

That a pretty good patch and pack date.

[DOM.]

That a pretty good patch and pack date.

well it rebooted last night lol but just passed a intelburntest at 5 times at max but need to work on the mobo settings cuz highest in windows was 7.5x575fsb killed that 480 i max on the E6400 and X3350 i had

but might still get a P5Q Dlx or MAX II idk yet might wait for i7 to come out for and old P965 it still works P5B Dlx

also whats the 24/7 mac vcore you go by ? 1.38- ?