**Official e8400/e8500 Retail OC Thread

[Darkatom]

So why does coretemp and realtemp temp readings differ so much with the e8400s ? Is it wrong to trust realtemp over coretemp ?

[realrena]

Yes... You might be slightly misinformed... I get about that on air!

wow too bad my chip cant do 4.0 @ 1.25V.... or could I...

At 3.6 i could do that temp.. at 4.0 @ 1.3625 I get 57 at load.. Using TRUE

[stephen23]

Is this under water? If not, what cooling do you use?
46C at load seems unbelievable for air... (or am I wrong?)

yesh, it is on water!

[~aoe~]

So why does coretemp and realtemp temp readings differ so much with the e8400s ? Is it wrong to trust realtemp over coretemp ?

RealTemp assumes a Tj max of 95C (based on the program writer's testing results) compared to CoreTemp and other programs that assume 105C. This means that RealTemp will report 10C lower temps.

RealTemp also attempts to cater for the non-linear increase of temps and 'sticking' sensors at lower temps.

It's difficult to advise which to trust as Intel will not release Tj max values for it's processors, so all programs are having to make assumptions. I can only suggest you read the thread and decide for yourself. Also bear in mind that (I believe) Intel have stated that the DTS sensors are primarily designed to control thermal shutdown and are not designed to reliably report lower temps.

Personally, I don't really care what the absolute temp of my CPU is as long my system is stable and the temps are within generally accepted tolerances. I use CoreTemp to check as it reports higher temps, and as long as CoreTemp reports temps below 70C and my system is stable, I'm happy. As it is, my load temps are 53C (ambient 21C). I'm currently running at 4GHz (8x500) 18+ hours Prime stable, but currently have no screen shot. I'll try and remember to take one next time.

[fireice2]

I guess it depends on the FSB and vtt you use. If I use 8x500 fsb, with 1.15vtt which I prefer, the gtls are 59/59/59. If you are at 4.05ghz with 1.29vcore, like in your sig, that's doing pretty damn well too. For some reason I had better luck with 8x and 8.5x multis for that speed.

I'm having trouble with higher clock speeds. This thing needs quite much more for higher speeds.

[natech]

I'm pretty newbie what comes to overclocking. I had opteron 144 before @ 2.7GHz all stock voltages.

Now this is my first WC rig and I don't even get temperature readings out of e8400. It's stuck on 30°C but in reality it should not be very hot. Now to the question.

Do I really have the worst e8400 that anyone could get, or am I doing something wrong? Becourse I really can't OC this processor much with stock voltages (on all, chipset etc). I got like 3.2GHz, whopping 200MHz rise.
With ~1.32V on bios I got 3.69GHz MAX, which was not even 24/7 stable. Just enough to run superpi 1M. I have corsair memory, TWIN2x2048-6400 G. WTF! I just noticed that the shop where I ordered my parts messed up with my memory. I ordered TWIN2x2048-6400PRO, and paid for them and I apparently got some G (what ever it means) memorys and not PROs. Now I'am glad I started writing this post
But still I have only ran the memory with divider, about 800MHz. So it should not be the limiting factor of OC. Should I rise voltages of chipset or something else instead of just adding more V to cpu?


Sorry about my bad english, hope you guys understand even something of what I just wrote

[fireice2]

@natech

It would help if you would also post your specs.

[~aoe~]

@natech

These processors are known to have 'sticky' DTS sensors and are not really designed to read low temps. I personally have 1 core stuck reading 42C until the temp rises above that value. Nothing to worry about really but I understand it can be annoying.

As the previous poster stated, your specs would be useful in order for us to be of further assistance.

[jimmsch]

Here is my final 24/7 OC. I think tis will be good to get me through even the hot summer months. RAM is on the 2.00A strap (1:1 with CPU) using 2.05v

System specs:
E8400@4.0ghz (445*9)...2x2gb G Skill DDR2-1000 @ 890mhz...Gigabyte X38-DQ6...Corsair HX620 PSU...MSI HD2600XT 512 Silent ...X Fi Platinum...2x500gb WD RAID0 - 2x320gb Maxtor RAID0 ...Zalman CNPS9700...Ultra Aluminus (black)...Hanns G 19" LCD 1440x900...Logitech Z5300e speaker

[sofarfrome]

And this one performs exactly the same as the previous one. Even the core temps are stuck at 45C, just like the first one. But this is a very very good batch. The previous one I had sold to someone on BE that is running some amazing scores on Dice or LN2 (forget which).

4.3GHz at 1.344vcore under load with no effort as far as tweaking goes.

[natech]

@natech

It would help if you would also post your specs.

Added info to my signature.

Also using latest 17 beta bios with IP35-PRO.

[stephen23]

And this one performs exactly the same as the previous one. Even the core temps are stuck at 45C, just like the first one. But this is a very very good batch. The previous one I had sold to someone on BE that is running some amazing scores on Dice or LN2 (forget which).

4.3GHz at 1.344vcore under load with no effort as far as tweaking goes.

how much vcore for 4Ghz stable?

[sofarfrome]

how much vcore for 4Ghz stable?

Don't know. Didn't try. My goal was 4.3 at <1.4vcore and I achieved it. I will probably play around with 4.4GHz next.

[fireice2]

pretty great chips. I need around 1.36v to be OCCT stable at 4.2ghz.

[mrcape]

Fireice, that's not so bad man. From what I've seen yours is probably still in the 85th percentile.

[ThatGuy16]

Yeah, thats not bad.. it seems the early batchs are the best overclockers with low volts. I'm running 4ghz with 1.248v on load, and haven't even tried seeing if its stable with even lower voltage, yet.

[Hughyhunter]

I need 1.38v for 4.05ghz. You guys that are stable with low voltage... that must be nice!

[turtletrax]

how much vcore for 4Ghz stable?

I have a Q743A748 and it does 4Ghz (500x8) @ 1.24v DMM tested. Just put it under a modest WC loop of Swifty GTX/MCR 220/DDC-2/DD FC GTS so I might try higher.

Havent seen many Q743's around, but they all have been pretty good at low volts.

[ThatGuy16]

I'm thinking about going higher as well

I need new ram for benching, my ram craps out at anything above 4.4ghz . With the 3dmark in my sig, i was giving the cpu far more volts than it needed. I can make it into windows at 4.5ghz with 1.4volts (still overvolting i think, didn't try less) but my ram was extremely unstable.

[camouflage]

Q751A*** batch:

[Dragon heart]

Q751A*** batch:

great one

where did you get it ?

[giorgos th.]

testing a Q807A067 with a bit bad waffer (8A1642) with air (TRUE),25C room temp and closed case..

[Strategos]

e8400 Q750A196 1.1125vid

for 4050(450x9) need 1.368v bad luck

[sofarfrome]

Q751A*** batch:

nice...my first q743a had a 0.875vid...looks like the Q751A is a winner

[Hughyhunter]

I'm thinking about going higher as well

I need new ram for benching, my ram craps out at anything above 4.4ghz . With the 3dmark in my sig, i was giving the cpu far more volts than it needed. I can make it into windows at 4.5ghz with 1.4volts (still overvolting i think, didn't try less) but my ram was extremely unstable.

Very nice score. I managed 197** at 4.5ghz (I needed 1.6v though to even get into windows) with 2 8800GT overclocked. I have Vista... You?

e8400 Q750A196 1.1125vid

for 4050(450x9) need 1.368v bad luck

This isnt bad luck... this is the norm. I need 1.38 for 450mhz. Anything lower than what you are talking is good luck. Anything above 1.4 is bad luck.