**Official e8400/e8500 Retail OC Thread

[Punjab234]

^ great chip

my E8400 requires 1.18~ real under load for 3.9 (Stock, VID is 1.212)
1.19-1.20 for 4GHz
1.32~ for 4.3~

[total90]

what max volt can i go with my e8500 c0 for 24/7 ?

thanks

[Dahaka]

I don't try with less vcore, but this motherboard ( DFI UT T3RS ) is strange, she doesn't like low vcores

[misho]

What batch of E8400 should I go with?

I got a choice of Q844 OR Q843.

Which one will OC better ?? Thx

[|Oc|REvO_HsArC]

9x500@4500 w/1.31v
i was able to lower my vcore by raising my vtt one notch for this run.
but theres only so much that can be done,the rest is up to the cpu.


fatguy1992 was right about the mch refyou really have to find sweetspot
well i switched my mch ref from 0.750 bios/0.700 ET6 to 0.770 bios/0.720 ET6
and was able to drop my vcore even lower.
9x500@4500 w/1.29v

Eh, you chip clocks the same as mine

My E8400 E0 does 4500mhz @ 1.3v IBT stable up to 70ºc Watercooled

[misho]

Hey guys can u tell me your batches/Frequency/Voltage?

I got a choice right now, E8400 E0, Q844 batch or Q843

Which one should I buy?

[misho]

OK,.. so I went and bought the E8400 E0, Q843B035.

Let me tell you, it performs almost the same as my older E8500 C0.

I got the f**king worst E0 ever created.

Right now, it fails at 490x9(4.4Ghz) @ 1.36 Volts, and needed 1.33Volts for 4.190Ghz. Now that is messed up!!!!!!!.

at 4.4Ghz its fails orthos after about 10 mins, Here are my full configs:

CPU Voltage: 1.360V
Northbridge/SB Voltage: 1.360
DDR Voltage: 2.2V
FSB: 1.3V
CPU Core1 GTL Ref Voltage: 0.67*VTT
CPU Core2 GTL Reg Voltage: 0.69*VTT
MCH GTL Ref Voltage: 0.67*VTT
CPU PLL Voltage: 1.7V
If you think these are too high, I also tried the lower voltages and still didnt work.

My mobo: Biostar Tpower i45
Mem: OCZ Reaper HPC PC8500 2GB
Can you guys tell me what the F**K is going on? I mean all the other E0s in this thread run very nice on low Voltages, and the Q843 Batches are good too.
Edit::: I also loosened up my memory (looser than a magicians sleeve actually, 7-8-8-18(5-5-5-15 stock)..
help be4 i explode for wasting $200 for this POS.

Thanks

[Demo]

1.57PPL ? isnt the safe limit for that at 1.450 for 45nm ?

[|Oc|REvO_HsArC]

default is 1.5v

Mine is at 1.54v since always.

[Leeghoofd]

OK,.. so I went and bought the E8400 E0, Q843B035.

Let me tell you, it performs almost the same as my older E8500 C0.

I got the f**king worst E0 ever created.

Right now, it fails at 490x9(4.4Ghz) @ 1.36 Volts, and needed 1.33Volts for 4.190Ghz. Now that is messed up!!!!!!!.

CPU Voltage: 1.360V
Northbridge/SB Voltage: 1.360
DDR Voltage: 2.2V
FSB: 1.3V
CPU Core1 GTL Ref Voltage: 0.67*VTT
CPU Core2 GTL Reg Voltage: 0.69*VTT
MCH GTL Ref Voltage: 0.67*VTT
CPU PLL Voltage: 1.7V
If you think these are too high, I also tried the lower voltages and still didnt work.

My mobo: Biostar Tpower i45
Mem: OCZ Reaper HPC PC8500 2GB

Thanks

K some facts : you really think you can get away with a mere 0.03Vcore increase to go from 4.2 to 4.5 ?

Why don't you try to stabilise 500FSB first with eg 8 multi. Those voltages you are pumping through the NB and CPU seem way out of control... Did you verify the voltage outputs via a DMM. Or are these the bios voltages you put in ?
Which Orthos test does it fail ? Blend, Small or large ?

First determine the Vcore via Small FFT , then work on the rams later...

You are going too fast and are wasting maybe a perfectly okayish CPU by just pumping volts. More isn't always better. Each board/CPU needs a certain combination of values to work, just upping one setting is not always enough...

Also did you copy a template of someone ? Sometimes that doesn't work at all... ; GTL tweaking and co is very CPU, Mobo, RAM dependant... try 3 the same boards and they all might need diferent settings

I never really worked with the biostar as my board smoked from day 2 at light load... I immediately sold the RMA...

I would start from zero , use 8 multi and slowly work ya way up on the FSB... else you will end up to be a very frustrated user... it could be ya CPU is a pos, but the voltages I see here are totally out of bounce...

[PatRaceTin]

hmmm for me ORTHOS With Priority 1 is nothing!!!

[Marecki306]

Hi, it's my first post on XS


Anybody have E8400 Q840? It's good batch?

[nukec]

Hi there? Did you disable your Epu-6 engine(Asus P5Q mobo), before you oced e8400?

[misho]

K some facts : you really think you can get away with a mere 0.03Vcore increase to go from 4.2 to 4.5 ?

Why don't you try to stabilise 500FSB first with eg 8 multi. Those voltages you are pumping through the NB and CPU seem way out of control... Did you verify the voltage outputs via a DMM. Or are these the bios voltages you put in ?
Which Orthos test does it fail ? Blend, Small or large ?

First determine the Vcore via Small FFT , then work on the rams later...

You are going too fast and are wasting maybe a perfectly okayish CPU by just pumping volts. More isn't always better. Each board/CPU needs a certain combination of values to work, just upping one setting is not always enough...

Also did you copy a template of someone ? Sometimes that doesn't work at all... ; GTL tweaking and co is very CPU, Mobo, RAM dependant... try 3 the same boards and they all might need diferent settings

I never really worked with the biostar as my board smoked from day 2 at light load... I immediately sold the RMA...

I would start from zero , use 8 multi and slowly work ya way up on the FSB... else you will end up to be a very frustrated user... it could be ya CPU is a pos, but the voltages I see here are totally out of bounce...

OK so: I tried everything from scratch at 8x multiplier, and voltage that is 0.025+ above stock, because If i leave it at auto, i dunno what voltage is gunna end up. Screenie::
So, with these minimal voltage increase I got up to FSB of 463mhz. At this FSB, i pass orthos CPU stress and the gromacs core. When I do the blend and ram test, fails after couple of seconds.

What should I do from here?

[misho]

^^^ I am guessing right now that bottleneck is RAM?

[misho]

^^^ Edit: So I booted up at 470x8, all voltages are the lowest(like i said in above post), except the ram, which I cranked up to 2.2V because it wouldnt boot up. This setup passes all the CPU tests on orthos, but fails the blend and ram test after couple of seconds.

Help

Thanks

[misho]

OK, so I was able to get it stable at 490x8 with a minor bump in northbridge and fsb volts, memory running at 2.2V,This passes all orthos tests.

Now going on to 500x9, fails everything after couple of seconds. Help

[Leeghoofd]

OK so: I tried everything from scratch at 8x multiplier, and voltage that is 0.025+ above stock, because If i leave it at auto, i dunno what voltage is gunna end up. Screenie::
So, with these minimal voltage increase I got up to FSB of 463mhz. At this FSB, i pass orthos CPU stress and the gromacs core. When I do the blend and ram test, fails after couple of seconds.

What should I do from here?

look at your Nb voltage it reads out 1.12, that's freaking low... giver her more volts there... if it passes the cpu test yet fails on blend it's usually bad setup of the NB voltage and GTL's...

maybe your cpu will only run at 4.5 with 1.45Vcore, not all EO cpu's are golden eggs and with FSB voltage around 1.3

[misho]

look at your Nb voltage it reads out 1.12, that's freaking low... giver her more volts there... if it passes the cpu test yet fails on blend it's usually bad setup of the NB voltage and GTL's...

maybe your cpu will only run at 4.5 with 1.45Vcore, not all EO cpu's are golden eggs and with FSB voltage around 1.3

OK, so I got it to 500Mhzx8 Stable. I bumped up the FSB volts and the NB volts, which still didn't work, so then I did a small increase on the vcore from +0.025 to +0.050, so the FSB volts and NB volts could go lower.

Screenie::

These are the volts.

Whats next?

After I tried 510Mhz, but orthos fails on all tests after 2,3 mins.Got no time to tweak ATM, gotta go sleep.


Thx

[Leeghoofd]

Plz use Prime (latest versions) and do the small test first to determine Vcore, do not run blend or Large as they involve the ram, MCH combo...

Is the Vcore stable under load ? How mich does it droop/drop ?

[misho]

Plz use Prime (latest versions) and do the small test first to determine Vcore, do not run blend or Large as they involve the ram, MCH combo...

Is the Vcore stable under load ? How mich does it droop/drop ?

OK so, when I do the Prime95 tests, vcore drops from 1.256 to 1.248.

Right now though, on prime95, I ran the small FFTs CPU test, and Worker#2(Core 2) stopped after 1 minute, but Core1 test is still going :S

[Jodiuh]

E8500 E0 @ 4.503Ghz 1.416v

This motivated me. It's 4AM, I can't sleep, there's a LAN coming up and a guy figured out how to make a million of us playable in L4D, so what else is there to do but blow up the pc, right? Here's my "I got into windows screenie" for now...



I'm gonna pick up one of those Thermaltake A2018's from fry's tomorrow and double the airflow on the TRUE for more palatable temps. I'm touching 70 on these 1200RPM SFLEX's. They're quiet, but damnit, my AC's running full tilt in an effort to keep hell out. I can't hear myself think and the pc has no business being quiet at a time like this!

[XMicron]

E8400 Batch Q832A915 Is Good ?!

VID : ?

Thanks

[Dagalidis]

This is My OLD E8400 C0 on Air.





But its time to move on i940 Path.... lol

[Borys]

My new toy:



Batch: Q820A732
Vcore: 1.2V Bios / 1.166V Digital Multiemeter