**Official e8400/e8500 Retail OC Thread

**xTKxhom3r** · 08-12-2008, 12:33 AM

i have my 8400 at 4.6 with a 1.45 vcore...iv tried 4.7 but its a no go.... even with 1.5vcore....

at 4.6 with a 1.45vcore my temps at load with prime reach a lil over 70 but hey its cool its not like im ever going to have it at 100% anyways

**gurusan** · 08-12-2008, 12:37 AM

it's prime stable? What's your batch number?

**AndrewL1950** · 08-12-2008, 01:14 AM

Alright, well after trying RealTemp, my cores seem to be at 33c-33c each, under idle. I assume it would be safe for me to overclock?

I still don't know why CoreTemp, and every other temp program was saying they were at 44-52.

**Pisklink** · 08-12-2008, 01:40 AM

Originally Posted by xTKxhom3r

i have my 8400 at 4.6 with a 1.45 vcore...iv tried 4.7 but its a no go.... even with 1.5vcore....

WTH I already need around 1.45v for 4.05Ghz!!!! I don't know if it's due to a bad chip or my mobo. Maybe somebody can tell when viewing my batch number (see sig). When it can be confirmed that it is due to a bad chip I will certainly buy a E8600 by the end of this year. I have to admit I still have to fine tune vCore but it won't be much less that is something I'm sure of.

I still don't know why CoreTemp, and every other temp program was saying they were at 44-52.

Because those other programs set a different Tj-max. They set 105 degrees while RealTemp has set 95 degrees. This is where the 10 degrees difference comes from. I thought that you can adjust the Tj-max setting in CoreTemp by hand in the option menu.

**AndrewL1950** · 08-12-2008, 03:45 AM

Thanks for answering some of the questions I have guys.

I have my 8400 at 3.6ghz, on stock voltage. My ram is at 5-5-5-15 500MHZ X 2

The current ratio is FSB

RAM 4:5. I have it unlinked in my bios.

My question is, since it's unlinked, would I still get better performance if my ram was 1:1? Would it be worth lowering it to 400MHZ X 2 to get the 1:1 ratio?

Since it's unlinked, I am not really sure if it's hurting my performance, or making it better.

Thanks for any answers.

Getting back into overclocking is taking a bit of re-learning to say the least.

**Pisklink** · 08-12-2008, 05:15 AM

Originally Posted by AndrewL1950

My question is, since it's unlinked, would I still get better performance if my ram was 1:1? Would it be worth lowering it to 400MHZ X 2 to get the 1:1 ratio?

It's hard to say from a distance. You should benchmark your current memory bandwidth and latency with Everest and SiSoft Sandra. Then take notes of the results and subsequently link your memory to the FSB. The advantage of linking your memory is that it runs under spec which means you possibly could lower your timings. You should run the same benchmarks again with the lower timings to see if it had any advantage.

**Plester** · 08-12-2008, 06:51 AM

E8500 Q813A38x OEM chip from Ewiz

**HDCHOPPER** · 08-12-2008, 09:59 AM

Originally Posted by Pisklink

I hope someone can help me out here. I keep on getting errors in Orthos on the second core I think. At least the error message appears constantly in the lowest box (see picture). I don't know what to do to let it disappear.

These are my current settings when stress testing small FFT's:

MP 9
FSB strap 400
FSB 450
PCIE 100
DRAM 1350
Timings 7-7-7-20-2N

Static Read disabled
Dynamic Write disabled
CLK Skew auto

AI clock twister auto
Transaction booster auto

vCore 1,45
CPU GTL 0/2 auto
CPU GTL 1/3 auto
CPU PLL 1,56
VTT 1,28
vDRAM 2,00
vNB 1,57
NB GTL 0,61
vSB auto

LLC performance
CPU spread disabled
PCIE spread disabled
CPU Clock Skew 300ps
NB Clock Skew auto

All energy saving stuff is disabled.

time to do your gtl & skew tweeking

from what eye read

dont have your board so cant help ya thier

**kpo6969** · 08-12-2008, 07:22 PM

Originally Posted by AndrewL1950

Thanks for answering some of the questions I have guys.

I have my 8400 at 3.6ghz, on stock voltage. My ram is at 5-5-5-15 500MHZ X 2

The current ratio is FSB

RAM 4:5. I have it unlinked in my bios.

My question is, since it's unlinked, would I still get better performance if my ram was 1:1? Would it be worth lowering it to 400MHZ X 2 to get the 1:1 ratio?

Since it's unlinked, I am not really sure if it's hurting my performance, or making it better.

Thanks for any answers.

Getting back into overclocking is taking a bit of re-learning to say the least.

**mskvorc1** · 08-12-2008, 10:22 PM

As I already mentioned my E8500 (Q816A678) needs 1.376V for 4037 GHz (9,5x425). My CPU FSB 1.2V and nForce SPP 1.4V. CPU FSB is actually CPU VTT. I'm thinking of trying 8x500, but I guess I'll need higher CPU FSB voltage for that. How high for 24/7 is good to go with CPU FSB? In my BIOS settings 1.20V is green while everything over that is in red. I'm aksing 'cause I read that high CPU FSB voltages can kill CPU even before than voltage over 1.4V for vCore...

**Pisklink** · 08-12-2008, 11:10 PM

Originally Posted by HDCHOPPER

time to do your gtl & skew tweeking

from what eye read

Thought so as well but at this moment I almost got me some settings which are stable without gtl and skew settings. I'm blend testing at this moment because CPU only and RAM only passed both for +8 hours in Orthos. At least I got some settings by then and can fine tune from there.

With LCC at normal instead of performance I need a whooping 1.5v in bios to get it stable under load!!!!

I got a vdrop of 0.043v and a vdroop of 0.024, together almost 0.07v!!!!

I think it is really bad and I'm wondering if this is only CPU related?!?

Originally Posted by mskvorc1

As I already mentioned my E8500 (Q816A678) needs 1.376V for 4037 GHz (9,5x425). My CPU FSB 1.2V and nForce SPP 1.4V. CPU FSB is actually CPU VTT. I'm thinking of trying 8x500, but I guess I'll need higher CPU FSB voltage for that. How high for 24/7 is good to go with CPU FSB? In my BIOS settings 1.20V is green while everything over that is in red. I'm aksing 'cause I read that high CPU FSB voltages can kill CPU even before than voltage over 1.4V for vCore...

I'm not completely sure but I thought 1.3v is still on the save side (read it on OCZ forum). In my Bios 1.3v is the first setting to become yellow and 1.4v becomes red.

**Zeus** · 08-13-2008, 12:07 AM

Guys, is it possible to rma a cpu because the temps between the cores is rediculously far apart?

My idle temps:

**mskvorc1** · 08-13-2008, 01:48 AM

Ok, here's the deal. Under Intel document about E8000 series processors I've found that max vCore and VTT are 1.45V (with vDrop) here:

Code:

http://download.intel.com/design/processor/datashts/318732.pdf

On page 17. But under processor specific finder for E8500 says max voltage of 1.3625V.

And what about VTT or CPU FSB voltage than? Is it 1.45V?

**HDCHOPPER** · 08-13-2008, 06:46 AM

Originally Posted by Zeus

Guys, is it possible to rma a cpu because the temps between the cores is rediculously far apart?

My idle temps:

yes

**CryptiK** · 08-13-2008, 07:04 AM

e8400

Code = Q751A357

VID (coretemp 0.99.1) = 1.225

Orthos/game etc stable @ 4005 MHz, 1.304v load

It does 590 FSB (screen) on 1.304v load

Bench easily at 571 FSB, 1.304v load

**C-N** · 08-13-2008, 07:06 AM

Originally Posted by mskvorc1

Ok, here's the deal. Under Intel document about E8000 series processors I've found that max vCore and VTT are 1.45V (with vDrop) here:

Code:

http://download.intel.com/design/processor/datashts/318732.pdf

On page 17. But under processor specific finder for E8500 says max voltage of 1.3625V.

And what about VTT or CPU FSB voltage than? Is it 1.45V?

Absolute max against recommended safe 24/7 max

**CryptiK** · 08-13-2008, 07:09 AM

Originally Posted by mskvorc1

Ok, here's the deal. Under Intel document about E8000 series processors I've found that max vCore and VTT are 1.45V (with vDrop) here:

Code:

http://download.intel.com/design/processor/datashts/318732.pdf

On page 17. But under processor specific finder for E8500 says max voltage of 1.3625V.

And what about VTT or CPU FSB voltage than? Is it 1.45V?

Max vcore = 1.3625v
Max VTT = 1.15v

Absolute max vcore = 1.45v
Absolute max VTT = 1.45v

Intel states in the data sheet that anything over the 'max' value may damage the processor.

**PytonOrm** · 08-13-2008, 07:15 AM

my E8400 Q748A142

Does max 5100mhz with tuniq tower 120

Valid Url : http://valid.x86-secret.com/show_oc.php?id=318677

Vcore

set 1,75v in bios

**Pisklink** · 08-13-2008, 02:11 PM

How about this?!? When I set LLC to normal CPU-z reports 1.432v (in bios set at 1.475v) which corresponds to a vdrop of 0.043v and when under stress it reports 1.408v. This is a vdroop of 0.024v. In total it drops with 0.067v!!!! Isn't that way to much?!?

And are these drop mobo or CPU related?

**HDCHOPPER** · 08-13-2008, 03:23 PM

Pisklink ...believe it's mobo

**HDCHOPPER** · 08-13-2008, 03:25 PM

Originally Posted by PytonOrm

my E8400 Q748A142

Does max 5100mhz with tuniq tower 120

Valid Url : http://valid.x86-secret.com/show_oc.php?id=318677

Vcore

set 1,75v in bios

hahahahaa how long did that sueeeeside shot last

exellent man just exellent !!

**bikebuilderdude** · 08-13-2008, 04:10 PM

Originally Posted by HDCHOPPER

ya that sounds screwy perhaps another bios?

It wasn't the bios, but the mb and cpu combo. New one works great. Thanks.

**Pisklink** · 08-14-2008, 12:06 AM

Originally Posted by HDCHOPPER

Pisklink ...believe it's mobo

Could you give an indication if a total drop of 0.067v is much or not? And how can I determine if its mobo related or not because at default settings it works fine?

**palee02** · 08-14-2008, 03:26 AM

I was benching with MSI HWs last week... It remains me some dice so I did a quick bench ( only for 15 min.

) with P5Q Deluxe + e8500 (Q811A681)... I couldn´t get a good temps, but here are the results at -25C

Super PI 1.5 8.843s

max. FSB 640MHz

**H4wk** · 08-14-2008, 09:24 AM

I have one question, which max voltage is save for 24/7? I set 1,425 V for 3,87 GHz, is that to much?

Thread: **Official e8400/e8500 Retail OC Thread

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