**Official e8400/e8500 Retail OC Thread

[Blackwhite]

Okay, been pulling a few of my hairs out over this lately.

It seems I didn't get a good one out of the batch. I think my CPU starts needing lots more power over 3.8ghz. At 426x9 ~3.8 I can complete orthos and prime for at least an hour on 1.35v. Once I start heading for the 4ghz line it starts needing VCore to reach stability. To get stable at 446x9~4014 I need 1.44 volts as reported by the hardware monitors, I haven't checked with a DMM yet.

I can boot into windows fine, run my applications, but as soon as I goto Prime it, it makes it about 10 seconds and fails. I have also tried adjusting my CPU VTT and GTLREF settings up and down 1% at a time from 55%-75%. No dice..

Perhaps I've got a bum chip here? How is everyone seeing vdroop affecting their OCs at higher frequencies? I am considering running to Rad-Shack tomorrow to pickup a variable resistor and try to get vdroop under control.

Part of me wonders if it will OC better with a proper BIOS from abit for the wolfdale CPUs?

Your chip is ok, I think so.I had the same - problem is with our Boards and the BIOS.
I have to set in BIOS 1.485vcore , MCH 1.45V and VTT 1.31V and then I can run stable on 4 GHz.Offset betwen BIOS and Windows is very big, and Real vcore is 1.39V (1.368V after vdrop).Dont touch GTLREF settings it is waste of time.

[giorgos th.]

Dont touch GTLREF settings it is waste of time.

very wrong...they are an important factor for stability..

[HaTaX]

Yeah, I noticed the large drop in requested voltage VS what is actually being supplied. That being said, to get to 4014mhz I have to set the voltage in my BIOS to 1.555...

Blackwhite, what is the VID on your chip? Mine is 1.0375 read in coretemp.

[ArCElM]

Your chip is ok, I think so.I had the same - problem is with our Boards and the BIOS.
I have to set in BIOS 1.485vcore , MCH 1.45V and VTT 1.31V and then I can run stable on 4 GHz.Offset betwen BIOS and Windows is very big, and Real vcore is 1.39V (1.368V after vdrop).Dont touch GTLREF settings it is waste of time.

OMG So it is not just me then? I thought there was something really wrong because I also have to set BIOS voltage very high to get much less REAL voltage.. it seems..

I have to set it at 1.465 BIOS (I think) but you say it is an offset between BIOS and windows? strange because, even in the BIOS PC Health Status it reads the same as Windows

Set at about 1.465v it reads..

1.32v - PC Health Status
1.352 - CPU-z
1.35 - Everest


I have the IP35-E and I am reading a few people mention something like this with these new chips on the Abit IP35 Series I think? but nothing as extensive as what I have here.

It SEEMS (and I pray this is correct or I am feeding my chip a very unhealthy ammount of vcore) I get 1.352 REAL 1.32v LOAD





But I just do not know, I guess I would have a total BUM chip if it needed 1.425+ to run at 4.05Ghz

EDIT: Urr I have just been looking at my old sig with my E6750 - E6750 @ 3600Mhz 1.49v (BIOS) 1.44v (Load) - 1.49 BIOS and 1.44 Under load? thats bugger all vdroop compared to whats happening now.. unless the sensors are buggered and I am killing my chip with 1.465vcore.

[Blackwhite]

Yeah, I noticed the large drop in requested voltage VS what is actually being supplied. That being said, to get to 4014mhz I have to set the voltage in my BIOS to 1.555...

Blackwhite, what is the VID on your chip? Mine is 1.0375 read in coretemp.

Huh it is strange with my CPU:
Without OC my VID is 1.125, after OC 1.0375
- coretemp 0.96.1
My chip is Q744A698 SLAPL

ArCEIM after setting 1.485v in BIOS , CPUz, EQ, Everest showing me 1.4v - my vdrop is 0.032V and I need this value (1.368v) to run 4 GHz
I've checked something - I've set 1.485v in BIOS, then I restarted my computer, and I've checked in BIOS ("PC Health Status") voltage was 1.39V, in Windows 1.4v - so definitly it is very big offset.
Definitly we need new BIOS from Abit.On my E6600 everything was fine - after set 1.325v in BIOS , windows red 1.28v, vdrop was 0.016v.

giorgos th. maybe it is wrong, but I've tried change this value, and was even worse - maybe I did something wrong

Here is my settings:

[HaTaX]

Need to be careful with GTL voltages, but generally if you're failing Prime or Orthos right away, GTL can help with that and you don't need to apply additional VCore. There's alot of threads out there on it but I found this post to be a good point of reference as it did increase my stability VS what I was "trying" to get done:
http://www.xtremesystems.org/forums/...91#post2716991

Anyway, I've noticed that I've got a good amount of VDroop going on here. .04 max between load and idle. I know that doesn't sound huge, but typically I can see my volts trail off just before orthos fails. Think the mod from johnny bravo would help out in my case? I may be able to minimize the VCore required to hit 4ghz by doing that, maybe I'm just a little nervous about degradation on these chips.... They haven't been out that long yet and I'd rather not kill this one so early on.

[Bl4ck^!]

Yeah, I noticed the large drop in requested voltage VS what is actually being supplied. .

it's your motherboard's fault m8 , P35 based ABIT mobos have such a vdroop.

I have a good one ... how HIGH is your o/c guys with EIST enabled ? i am interested about it.

[Blackwhite]

Need to be careful with GTL voltages, but generally if you're failing Prime or Orthos right away, GTL can help with that and you don't need to apply additional VCore. There's alot of threads out there on it but I found this post to be a good point of reference as it did increase my stability VS what I was "trying" to get done:
http://www.xtremesystems.org/forums/...91#post2716991

What is your settings GTL voltages?
I've got standard 63%, after 67% my computer don't want to start.VVT is 1.31v - 1.2v real

BTW - I heard (it is nothing sure) Intel will give new steppings, because it is something wrong with this one.

[Plastok]

Q743A797
Pack date : 01/17/08

[Ad1tya]

My 24/7
Idle 1.43vCore, Loaded = 1.37-1.39vCore





Max PI on Water.
Set 1.7550 in BIOS for 1.67 vCore IDLE. . vCore/vDroop Mod coming soon! .



Chip goes under DI soon :yes:

[Merc14]

There seems to be the usual amount of confusion about temperatures so here's another way to directly access the data from within the Intel CPU.

Start up CPU-Z and go to the About tab and click on the Registers Dump (.txt) button.
Save this file, open it and scroll down to the model specific registers for each of your cores.



MSR 0x0000019C contains the only Intel documented temperature data for these processors. By looking in here you are reading the digital thermal sensors (DTS) directly. Bits [22..16] are located in the third and fourth digit. In my example that is 0x3F hexadecimal which equals 63 decimal.

If you are mathematically challenged then fire up Calc or head to Google and type in:
0x3F in decimal
and it will do the conversion for you.

This shows that my Core0, at idle, is 63 degrees away from TjMax or its safe maximum operating temperature.

I am using an older E6400 which has a TjMax = 85C so CoreTemp reads the DTS data and then calculates that my absolute temperature is 63C degrees away from 85C so it reports an idle temperature of 22C (85C - 63C). CoreTemp is using TjMax = 105C for the new 8x00 series processors.

Intel neither publicly documents that these on chip sensors are accurate for low idle temperatures or provides any public documentation stating what TjMax actually is. It only documents that these sensors are used for thermal throttling and ultimately for thermal shut down if needed.

When your processor heats up the DTS will decrease. When the DTS approaches zero you will begin to slow down due to thermal throttling kicking in but most people are miles away from that ever happening. As long as you always have some headroom as reported by the DTS and your computer is stable at full Prime load then there is no reason to be too worried about your absolute temperature. It is just a number and you are operating within the Intel temperature spec for these chips. At 4+ GHz you might be a little over on that spec but that's a secret that Intel doesn't need to know.

You can also start CoreTemp and go into the Options->Settings menu item and turn on Show Delta to Tjunction max temp.
This setting also reads the DTS data directly and should exactly correspond with the above DTS data that CPU-Z prints out.

Unclewebb-
Thanks for the info. Very well written and understandable. It is the idle temps that I was concerned about as the peak temps seem low for the stress I was putting the chip under. I'd come to the same conclusion that the chip is a keeper since I had a long way to go before i got anywhere near Tj. I'll now not worry so much about the idle temps thanks to you.

[vera]

What is your settings GTL voltages?
I've got standard 63%, after 67% my computer don't want to start.VVT is 1.31v - 1.2v real

BTW - I heard (it is nothing sure) Intel will give new steppings, because it is something wrong with this one.

The gtl options available for asus p5k-e ?

[Zeus]

The gtl options available for asus p5k-e ?

If you flash to bios 1002 they are but i have a feeling they don't work.
Changing these settings does nothing for stability on my board.

[Blackwhite]

So for better stability I shoul set GTL higher or lower?

[vera]

It's really hot

[vera]

If you flash to bios 1002 they are but i have a feeling they don't work.
Changing these settings does nothing for stability on my board.

same on me

[dissident]

hmmm... I got my chip in the mail but haven't opened it.. some of these results aren't all the encouraging.. I'm using an ultra 120 extreme with a Q6600 right now that's prime stable at 3.6 GHZ with 1.33 volts in windows, with load temps under 60 degrees, and I don't know if I'm willing to trade those extra cores for only 400 or 500 mhz, and with high volts and temps just to get there. I was counting on 4.3 -4.5 prime stable, and although 4.3 is possible although unlikely, it looks like 4.5 is quite unlikely. 4.0-4.1 isn't enough for me to switch I don't think.

what to do...

[AriciU]

4.3 is OCCT stable with 1.48v (real) at a max of 64C using a TR Ultra 120 (not extreme) + scythe fan and AS5. I've tested with orthos for about 1 hour and it was fine. FPO was Q745

[Zeus]

I don't know wtf is going.

This 8500 can't finish superpi 1M at over 4570MHz, not even with 1.57V.

I really like to know what's crap, the cpu or the board?

Asus made a mess by putting GTL voltage setting bios that does nothing.

AriciU, does changing GTL voltage do anything for you?

[AriciU]

Nope. Only things modified for my runs were NB volts at 1.55, fsb term at 1.40, cpu volts at 1.68 (bios), rest was all auto... except ram of course.

[ic3m4n2005]

I'm currently thinking about getting a 8200 for a htpc build to exchange my T7400.
My plan is to clock it around 3 ghz and undervolt as far as i can.

So can anyone with an average cpu check how low he can get the vcore @ 3 ghz ?
And do you guys think it's worth the change ? I mean regarding power consumption and performance (mainly for HD decoding).

[necron66]

E8400
Batch Q746A377

Ran like a dream on my DS3P. This was OCCT stable. 500x8 1.35v bios





Now I have it in my Asus p5e and I can't get this result back.
I got a 3D Mark 06 run on the p5e
http://service.futuremark.com/compare?3dm06=4984060

Considering putting it back in the P35.

Any one running a 8400 in a p5e???? Can you PM me your settings if you are plz.

[Mickey Padge]

OK I have my E8500 running at 4200Mhz, 525x8, water cooled, Fuzion 5.5mm, Laing 18W and a Swiftech 320 with Silent Eagle 2000@ 7v. I Also have a 8800Ultra in the loop, with a full cover EK.

Using 1.45v vcore set in BIOS + 1.30vtt, it idles at:

Ambient temp 24c
core0 33c
core1 41c

Orthos small FFT's Load:
core0 54c
core1 60c

Are those temps OK? Its weird how the cores have such a difference in temps at idle and load, but no matter how I mount the block, it is the same. I am using the D-Tek pro mount system too...... I have an Abit X38 mobo and CPU-Z shows my Vcore to be 1.192v, whats up with that?

Seems to be stable though, no matter what tests/games I throw at it

[Chri$ch]

Not a good 1M time, but low voltage for this clock (load ~1.39v)

this is on Gigabyte GA-G33M-DS2R

[Zeus]

Not a good 1M time, but low voltage for this clock (load ~1.39v)

this is on Gigabyte GA-G33M-DS2R

E8200 and this G33 chipset seem to run in perfect harmony.

Great result, wish my P5K-E and 8500 liked each other more.