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Need help OCing my e8400 (3.0Ghz Dual core) past 3.9Ghz

post #1 of 3
Thread Starter 
Hi there!

My '09 machine is still running, and I've been meaning to push it to its limits since last year. Recently I scored a free copy of BF4 and I'm interested in finding out how far I can go with what I have (instead of having to buy a new system).

My specs:
MOTHERBOARD: EVGA nForce 750i SLI Motherboard -NVIDIA nForce 750i - http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=4240124&CatId=3495
PROCESSOR: Intel Core 2 Duo E8400 Wolfdale 3.0GHz 6MB L2 Cache LGA 775 65W Dual-Core Processor - http://www.newegg.ca/Product/Product.aspx?Item=N82E16819115037
MEMORY: Patriot Viper II 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Desktop Memory (X2=8gb) - http://www.newegg.ca/Product/Product.aspx?Item=N82E16820220426
GPU: EVGA 896-P3-1255-AR GeForce GTX 260 Core 216 896MB 448-bit GDDR3 - http://www.newegg.ca/Product/Product.aspx?Item=N82E16814130434


I know specs are a tad old, but I rarely game anymore, and this system glides through whatever I've thrown at it to date!

I'm a total noob when it comes to overclocking. This is my first attempt at doing so and I'm hoping to reach 4.5Ghz (or at least best the 4Ghz mark). I know the performance difference between 3.9 and 4.0 is negligible (1-2%?), but I do want to see what this guy is capable of doing!

Here's what I got so far:
db33db7ab0f88ac36eccd2797703c69c0a110cbdea.pngdb33db7ab06beb052ce2d947d1ecbbab45d1164096.png
Idle temps: 35 Celsius
Load temps: 45 Celsius

*note* I've set CPU core to 1.312 V, but I think Vdroop is increasing/decreasing it according to what it thinks is best.. CPU idles at 1.312V for some reason, but as soon as load is added, it drops to 1.296. Perhaps I should just disable Vdroop...

I've tried bringing up the core voltage (up to 1.4v) and tried increasing ram voltage (up to 2.15). Even went ahead and underclocked the ram to see if cutting some slack does anything, but nope...

I've been able to run prime95 stable with a similar setup for over 24 hours (only difference is that RAM was clocked .1V lower than what it's at now (2.0V now)).

Is my RAM or MOBO holding me back? Every time I increase the the FSB to > 444.44, I hit a boot loop with Windows. The BIOS posts, but soonafter I get an option to run startup recovery or boot into windows normally. When I select either option, I get a "Windows is Loading Files" screen with a bar right above it. Sometimes the bar doesn't complete and just hangs at that screen. Other times the bar fills up, and computer just boots all over again -- starting at BIOS post.

I'm not too sure what's left to try... I don't mind taking my CPU Core voltage up to 1.6.. I know it'll damage my processor, but truth be told, I'm looking to building a system within the next year. I'm willing to take some risk, but would like to avoid if possible (at least until I've build my next system).


Anyone have any suggestions?

On a (un?)related note, as I was stress testing my computer today while at school (just decided to run another 24/hr stress test for reasons unbeknownst to me..), my computer crashed and a BIOS error was left once it booted.

Lately I haven't received any BSODs, but this may be related to some voltage change. I'll run another 24hr stress test tomorrow and see if this is a recurring issue. If not, I'm just going to let it slide.



Here are the details of the BSOD:
Code:
Problem signature:
  Problem Event Name:BlueScreen
  OS Version:6.1.7601.2.1.0.768.3
  Locale ID:1033

Additional information about the problem:
  BCCode:3b
  BCP1:00000000C0000005
  BCP2:FFFFF960000F79DF
  BCP3:FFFFF8800E7C7FF0
  BCP4:0000000000000000
  OS Version:6_1_7601
  Service Pack:1_0
  Product:768_1

Files that help describe the problem:
  C:\Windows\Minidump\111413-27019-01.dmp
  C:\Users\Wolf\AppData\Local\Temp\WER-60091-0.sysdata.xml


I'd appreciate help tackling OCing my CPU past 4.0Ghz if anyone has any input!

Thanks a lot =]
post #2 of 3
Those motherboards (and similar) had fsb walls/holes where some settings just didn't work. Sometimes settings that produced a better overclock actually worked.
As long as temps are good you can go up on vcore, 1.4v seems pretty safe. If your dumping it in a year, maybe 1.45/1.5 might even work. Temps might get you though. If the chip burns out, there are plenty to be had, and even the 771-775 can give you a quad core on the cheap (with a better binned xeon).

Hmm. Looking at your codes, your ram/ ram settings might be suspect. You might want to run memtest and see if there are any errors.

As for higher overclock, if you can do around 444, maybe going past it would work. Try dropping your multiplier down to 8 and then your fsb to 500 or so. I'd up the vcore to 1.4 off the bat then if you find a stable configuration see if you can lower it. This may be more fsb than the board could handle but worth a try.

Once you get your cpu overclocked you can play with the ram. If 500 works setting your ram to run at 500 (1000 effective) would be a nice 1:1 ratio and could lead to better performance/stability.

Else just keep the 9 multi and just keep upping the fsb at 1.4 vcore. You might find a higher clock that is more stable.

Lastly look for a vdroop mod on your board. Most have them. It just involves shading over a transistor or two with a pencil. Supposedly it hurts the life on the cpu running at full, but I haven't heard of any reports/ experienced it myself. At this stage/what your wanting to do, go for it.


good luck.thumb.gif
post #3 of 3
Thread Starter 
Quote:
Originally Posted by Servos View Post

Those motherboards (and similar) had fsb walls/holes where some settings just didn't work. Sometimes settings that produced a better overclock actually worked.
As long as temps are good you can go up on vcore, 1.4v seems pretty safe. If your dumping it in a year, maybe 1.45/1.5 might even work. Temps might get you though. If the chip burns out, there are plenty to be had, and even the 771-775 can give you a quad core on the cheap (with a better binned xeon).

Hmm. Looking at your codes, your ram/ ram settings might be suspect. You might want to run memtest and see if there are any errors.

As for higher overclock, if you can do around 444, maybe going past it would work. Try dropping your multiplier down to 8 and then your fsb to 500 or so. I'd up the vcore to 1.4 off the bat then if you find a stable configuration see if you can lower it. This may be more fsb than the board could handle but worth a try.

Once you get your cpu overclocked you can play with the ram. If 500 works setting your ram to run at 500 (1000 effective) would be a nice 1:1 ratio and could lead to better performance/stability.

Else just keep the 9 multi and just keep upping the fsb at 1.4 vcore. You might find a higher clock that is more stable.

Lastly look for a vdroop mod on your board. Most have them. It just involves shading over a transistor or two with a pencil. Supposedly it hurts the life on the cpu running at full, but I haven't heard of any reports/ experienced it myself. At this stage/what your wanting to do, go for it.


good luck.thumb.gif

Thanks for your reply Servos!

Upon further investigation, it appears that my motherboard has an FSB wall of ~445. I dropped the multiplier down to 7 and pushed my FSB to 445, but no dice.

I'll just mess around with what I have for now with the intention of purchasing something down the road within the year..

Thanks again!
I'll look into the VDroop mod you suggested. See what happens =]

Thankss!

Wolf
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