OverClocking E8400 On Stock Cooling !

[metalnumb]

Hey All Guyz Out There !

 

i just wonder if i can OC My E8400 from 3GHZ to 3.5GHZ on stock cooling and if it will be stable enough to work for several hours ON FULL LOAD !?? !!?

thanks people !

 

my mobo is : P45-UD3L gigabyte

OCZ DDR2 RAM 2GB

[MasterRex862]

The E8400's have great overclocking potential, but I'm leery of provoking you to try it. Take baby steps, and see what your processor can handle. What kind of temps are you looking at with stock cooling, anyway?

 

Quick Edit- You should probably read this before continuing.

Edited October 29, 2009 by MasterRex862

[Bob16314]

Who knows..Only one way to find out..The Tj Max for the E8000 series is 100C..It's a generally acceptable practice not to exceed 10C below that temp during extreme and unusual load conditions (Prime95, IBT, OCCT, etc.)..So if you're getting in the low 90C neighborhood on occaision, it's no biggy..And IF you do hit the Tj Max, the CPU will begin to throttle (sets PROCHOT#) in an effort to save itself (IF..IF you have the thermal control ckt(s) enabled in the BIOS)..All you can do is try it and see..Use a program such as Real Temp that you can set a high temp alarm or auto shutdown..You'll NEED to calibrate it properly of course so it reflects the true temp..Read the documentation.

 

http://www.tomshardware.co.uk/intel-dts-sp...news-29460.html

 

http://www.techpowerup.com/realtemp/

[Flibo]

Yes, you can overclock it to 3,5 GHz and it will be stable with sufficient amount of voltage, but the real thing you have to keep an eye for are the temperatures. As MasterRex862 said, you might want to take little steps and check your temperatures once in a while. If they reach ~80 degrees with full load, you should get worried.

Edited October 29, 2009 by Flibo

[RJR]

It's a generally acceptable practice not to exceed 10C below that temp during extreme and unusual load conditions (Prime95, IBT, OCCT, etc.)..So if you're getting in the low 90C neighborhood on occaision, it's no biggy.

 

NO IT'S NOT a generally acceptable practice to run your processor 10c below Tjmax.

 

It's only a biggy if you want your processor to last more than a week. Don't let your processor go anywhere near 90c!!!!!

 

The Toms article you referenced was only talking about sensor accuracy, not thermal specs.

[MystoGators]

It's very easy to get an e8400 to 3.6, even on stock air. Go to the bios, increase the CPU clock ratio to 9x, CPU host frequency to 400mhz , and the PCI express bus to 100mhz; no need to mess with the voltage (s) or anything.

 

Edit: Just noticed a problem I'm having in my bios. My memory is supposed to be 1066, but the 2nd one is now 1280. I don't think it's ever done that before. I have a gigabyte ep45-ud3p with 2 sticks of g.skill ddr2 1066. Is there any way I can keep my e8400 at 3.6 without that ram speed changing? Thanks.

Edited October 30, 2009 by MystoGators

[xchrissypoox]

Edit: Just noticed a problem I'm having in my bios. My memory is supposed to be 1066, but the 2nd one is now 1280. I don't think it's ever done that before. I have a gigabyte ep45-ud3p with 2 sticks of g.skill ddr2 1066. Is there any way I can keep my e8400 at 3.6 without that ram speed changing? Thanks.

Can you lower the memory multiplier? the speed of ram is determined by the memory multipler time the fsb

[Bizzlenitch]

It's very easy to get an e8400 to 3.6, even on stock air. Go to the bios, increase the CPU clock ratio to 9x, CPU host frequency to 400mhz , and the PCI express bus to 100mhz; no need to mess with the voltage (s) or anything.

 

::inserts grain of salt here:: Every chip is different. I'm sure there are plenty of E8400s that won't do 3.5GHz on stock volts. In fact, I built a rig for my brother and attempted exactly what you mentioned on his E8400 and it did not result in a stable OC. So, lacking time to properly OC the machine I left it at stock speeds. Your generalizations are quite broad. My 2 cents.

[MystoGators]

Can you lower the memory multiplier? the speed of ram is determined by the memory multipler time the fsb

 

You mean the memory multiplier for the ram, right? It's set to auto. Lol sorry, I'm very new to overclocking.

[xchrissypoox]

You mean the memory multiplier for the ram, right? It's set to auto. Lol sorry, I'm very new to overclocking.

yeah just lower that below what the ram is specced at so if it is ram that is supposed to run at 1066 set it to whatever multiplies to below 1066.

[MystoGators]

yeah just lower that below what the ram is specced at so if it is ram that is supposed to run at 1066 set it to whatever multiplies to below 1066.

 

Thanks for the help. I had to change to (G) MCH Frequency Latch to 400mhz (it was set to auto), then I just changed the System Memory Multiplier to 2.66D. It's working like a charm at 3.6 now, and both read 1066.

I want to get it up to 4.0 (I've got a good aftermarket cooler), but I'm too scared to mess with the voltage (s). The stock is 1.22500. I read a guide that said changing the FSB to 440 would get around 4.0, but I would have to up the voltage to at least 1.4. It also said that going above 1.4 was a big risk for a 45nm processor.

 

Edit: I got it to 3.99ghz; that's close enough to 4.0 for me. I didn't even mess with the voltage. The guide said you had to put the voltage up to 1.6 to get above 440, but I left that alone. I think I made the right decision...hopefully. :/

CPU Host Frequency - 444

(G) MCH Frequency Latch - 333mhz

System Memory Multiplier - 2.40B

Edited October 30, 2009 by MystoGators

[xchrissypoox]

Edit: I got it to 3.99ghz; that's close enough to 4.0 for me. I didn't even mess with the voltage. The guide said you had to put the voltage up to 1.6 to get above 440, but I left that alone.

Great, but don't forget to stability test it well if that is your final overclock (truth be told I think 4Ghz is excessive, I've lowered mine to 3.6Ghz and can't tell the difference). You should run prime95 or linpack for hours to test (watch the temps as you probably know though on a dualcore they're probably okay no matter what you do).