**Official e8400/e8500 Retail OC Thread

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10-30-2008, 09:21 AM
punx223

Quote:

Originally Posted by zlojack

There is one setting you're forgetting about: tRD

You can have a nice high FSB with a low multi and get higher latency due to a high tRD (Performance Level) which can offset any gains from more bandwidth.

so very true.. without it tweaked right you will not gain from the extra bandwidth.... thank you zlojack
10-30-2008, 10:10 AM
misho

Quote:

Originally Posted by punx223

so very true.. without it tweaked right you will not gain from the extra bandwidth.... thank you zlojack

Yea so I will have to tweak and test the memory timings etc..
Will do that tonight once I get home and unplug my harddrives..
10-30-2008, 11:33 AM
FabricioGS

Quote:

Originally Posted by SimpleTECH

That is perfectly fine. IMO, anything under 1.40V is considered 24/7 worthy. :)

Just make sure you keep account of your temperatures, that's all.

Thanks SimpleTECH. Temps are ok. Now i'll try to find the higher clock with 1.40v set. I'm loving this chip :D
10-31-2008, 08:06 AM
YMAA

Here's my E8400 E0, batch Q826A399, week 08/13/08.

http://i183.photobucket.com/albums/x...45GHz1312v.jpg

Folded all night at this speed. And here's a validation:

http://valid.x86-secret.com/show_oc.php?id=439932

Might try for a higher clock later today.
10-31-2008, 08:28 AM
misho

Quote:

Originally Posted by YMAA

Here's my E8400 E0, batch Q826A399, week 08/13/08.

http://i183.photobucket.com/albums/x...45GHz1312v.jpg

Folded all night at this speed. And here's a validation:

http://valid.x86-secret.com/show_oc.php?id=439932

Might try for a higher clock later today.

OMFG SEE LOOK AT THIS GUYS ! 1.312V at 4.5Ghz E8400!

:shocked::shocked::wiggle::wiggle::wiggle::wiggle: :wiggle::wiggle::wiggle::wiggle::wiggle: Why can't I have that :( :( :( :(: :(
10-31-2008, 09:32 AM
FabricioGS

Quote:

Originally Posted by YMAA

Here's my E8400 E0, batch Q826A399, week 08/13/08.

http://i183.photobucket.com/albums/x...45GHz1312v.jpg

Folded all night at this speed. And here's a validation:

http://valid.x86-secret.com/show_oc.php?id=439932

Might try for a higher clock later today.

I can post like this too but.. is it stable? :rolleyes:
10-31-2008, 09:41 AM
YMAA

Stable as a bird. It was running FAH all last night without a hiccup. The chip is getting pretty hot though. I may remount the waterblock later today, I might've shifted it while doing the tubing.
10-31-2008, 09:51 AM
misho

OK SO I tried 9x multipliers higher FSB voltage, higher pll voltage, 8.5x multi still very unstable at 4.3GHz, fails orthos in 2 seconds, games crash real bad...
I guess there is NO way to get this cpu stable above 4.2Ghz without increasing the CPU voltage from 1.38V to something higher...........................

I read some ppl had their CPU for over 8 months on 1.5V running fine.. what do you guys think?
10-31-2008, 10:04 AM
jaredpace

Quote:

Originally Posted by misho

OMFG SEE LOOK AT THIS GUYS ! 1.312V at 4.5Ghz E8400!

:shocked::shocked::wiggle::wiggle::wiggle::wiggle: :wiggle::wiggle::wiggle::wiggle::wiggle: Why can't I have that :( :( :( :(: :(

cause your doing something wrong.
10-31-2008, 10:05 AM
YMAA

What are your system specs, misho?
10-31-2008, 10:09 AM
unclewebb

I think once you hit 1.40 volts, you should call it a day for 24/7 use. The difference between 4300 MHz and 4200 MHz is 2.4%. There isn't an application in the world where you will ever notice the difference so why risk stability for such a tiny gain. For benching there's some fun to be had beyond 1.40 volts but for day to day use you don't gain a hell of a lot.
10-31-2008, 10:14 AM
jaredpace

1.40v should be "loaded cpu vcore read by cpu-z or DMM"
10-31-2008, 10:15 AM
subaruwrc

Quote:

Originally Posted by YMAA

Here's my E8400 E0, batch Q826A399, week 08/13/08.

http://i183.photobucket.com/albums/x...45GHz1312v.jpg

Folded all night at this speed. And here's a validation:

http://valid.x86-secret.com/show_oc.php?id=439932

Might try for a higher clock later today.

nice clock with low voltage :clap: other settings?
I like your wallpaper :D
10-31-2008, 10:32 AM
YMAA

These are the settings I can remember for that speed. I'm testing 4.6GHz now.

All skews set to Normal
Pull-ins Disabled
All GTLref set to Auto

vNB - 1.2v
vFSB - 1.2v
vPLL - 1.5v
DRAM - 2.1v (still testing...getting used to the new Mushkins)

EDIT: I'll have to find out how to record BIOS settings directly from the BIOS, I think there's a way to do it.
10-31-2008, 11:03 AM
misho

Quote:

Originally Posted by YMAA

What are your system specs, misho?

CPU IS E8500 C0, batch q818a102, date 06/27/08
MOBO is BIOstar Tpower I45,
memory: OCZ REAPER HPC 2 x 1GB, DDR2 8500
Corsair HX 520watts
COOLING: Thermalright Ultra 120 Extreme paired with 2 x Scythe KAZE ultra 120mm 2000rpm.
Temps at 1.38V is 30 idle, 41C MAX
But look at yours, you can EASILY hit 4.7Ghz with something close to 1.38V, and that is crazy.. Soo lucky u got that cpu LOL :jealous:
10-31-2008, 11:17 AM
LagunaX

Most C0's cannot compare to E0's for higher ghz at lower vcore - a 4.2ghz C0 is a rare gem that unfortunately is not worth as much nowadays...I have a e8400 C0 that takes 1.37v for 4.2ghz...
10-31-2008, 11:21 AM
YMAA

Try tweaking your GTLref. Start at .63 and work your way up. Some 45nm chips seem to like .63, others like .67. Usually if you're running Prime95 and one thread fails you can maintain that vCore and tweak your GTL.
10-31-2008, 03:00 PM
hktony

Quote:

Originally Posted by LagunaX

Most C0's cannot compare to E0's for higher ghz at lower vcore - a 4.2ghz C0 is a rare gem that unfortunately is not worth as much nowadays...I have a e8400 C0 that takes 1.37v for 4.2ghz...

i need to stablize my cpu at 1.45 v at bios :( to have 4.25ghz ....
poor me c0 e84
10-31-2008, 03:05 PM
hktony

Quote:

Originally Posted by YMAA

Try tweaking your GTLref. Start at .63 and work your way up. Some 45nm chips seem to like .63, others like .67. Usually if you're running Prime95 and one thread fails you can maintain that vCore and tweak your GTL.

thats mean i can change the cpu gtl voltage and lower my vcore then check if it is stable or not ?
10-31-2008, 06:27 PM
misho

K guys I changed GTL voltage, pll etc, memory too but nothing

still VERY unstable
10-31-2008, 10:43 PM
YMAA

You have to tweak to find it. EVERY CPU likes a different value. Generally what you do is start with a common value, like .63 or .67, then experiment to find what your CPU likes. GTL takes a LONG time to figure out. It helps to change one thing at a time, it may take longer but makes it much easier to isolate problems (things you need to change).

Are you sure it isn't your RAM? Take your RAM well below stock speeds, run at stock voltage, and do a Prime95 small FFTs test to stress just the CPU. Once you've found a speed your CPU likes, clock the RAM back up and see what it likes in terms of clock speed, timings, and voltages.
11-01-2008, 04:33 AM
PytonOrm

update today =) all this is on Air with tuniq tower 120

http://valid.x86-secret.com/show_oc.php?id=440390

5130mhz done * even try 5161mhz but when i save at my hdd was it corrupt :(

:D tested benched at 5026mhz with 1,76v and superpi 1M gave me 9,3 sec with timings 4-4-4-4@vmem 2,2v
11-01-2008, 04:59 AM
jaredpace

Quote:

Originally Posted by hktony

cpu at 1.45 v at bios

this usually means nothing as it is not the actual volts the cpu is getting. ;)
11-01-2008, 05:01 AM
jaredpace

Quote:

Originally Posted by PytonOrm

update today =) all this is on Air with tuniq tower 120

http://valid.x86-secret.com/show_oc.php?id=440390

5130mhz done * even try 5161mhz but when i save at my hdd was it corrupt :(

hi, what is the maximum CPU speed that you can pass 1 hour prime/orhtos with? ~4800mhz?:p:
11-01-2008, 10:50 AM
PytonOrm

:D update again

http://valid.x86-secret.com/show_oc.php?id=440530

5192MHZ done *

what is Wr on E8500 and E0 on air ?

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