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E6420 - Help needed

post #1 of 13
Thread Starter 
Allright, I currently have a stock E6420 with it's stock cooler and I've wanted to overclock it pretty long time ago but never had the guts. So now I would like to do that, but I certainly need some help.

It might be good to start with parts:
- E6420
- Abit IP35
- Corsair 4GB DDR2 800mhz

I know the basics of overclocking, but I'm very unsure what voltages I should set for my CPU if I want to overclock it to 2.8Ghz. My CPU temperature is 33-37C when its "resting". You guys certainly know this so would be nice to have your help

Thanks and btw, could you tell me a good program that could test the stability of my CPU?
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post #2 of 13
With a stock heatsink, you are limited in the vcore you can supply the CPU because of the poor cooling. The vcore increas has a direct effect on your temps. So keep the temps below 58°C when you are on load and you will be fine.

Your E6420 can handle 1.5v as specified by Intel. But you would need a really good cooler to try the max. I would suggest keeping it under 1.325v with the stock cooler. You can try a test run by only increasing the vcore, then see what your load temps are by running Orthos (found in the downloads section). If the temps dont go over 58°C (max of 60.1°C according to intel), you are good to go with that vcore. so try raising you FSB to 333, then go up 10 MHz at a time until you get to about 375 FSB.

Just remember to change your ram's divider so that your ram isnt runjning out of spec. becasue as you increase the FSB, the ram will also increase.

Lastly, you might need to bump northbridge voltage (might be called (G)MCH in some P35 bios) one notch, to something like 1.3v, to run the higher FSB past 333.
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post #3 of 13
Thread Starter 
Ok, thank you. I'll go testing soon. Just one question: ain't it ok to use 1:1 divider until 400 FSB with 800Mhz ddr2?
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post #4 of 13
I have mine stable at 3.0Ghz. I did get a Arctic Freezer Pro 7 (cheap effective cooler) though because temps were getting to high with stock cooler at this speed.

FSB 375Mhz x 8 multi = 3ghz (1500mhz set in BIOS)
RAM 400mhz (unlinked of course)
5-5-5-15 2T manually entered
Running a 15:16 ratio

RAM 1.9v
NB - I believe I set it to the lowest (1.4v or something like that)
+100mv offset also enabled
vCore is at around ~1.3v

I do have a different MB though, so some of your settings may be different than mine.

But, that is what I have mine set at.
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post #5 of 13
Quote:
Originally Posted by regr View Post
Ok, thank you. I'll go testing soon. Just one question: ain't it ok to use 1:1 divider until 400 FSB with 800Mhz ddr2?
You are correct. So if you have a 1:1 divider with 375 FSB, your ram will be running at DDR2 750.

Quote:
Originally Posted by jbobb View Post
I have mine stable at 3.0Ghz. I did get a Arctic Freezer Pro 7 (cheap effective cooler) though because temps were getting to high with stock cooler at this speed.

FSB 375Mhz x 8 multi = 3ghz (1500mhz set in BIOS)
RAM 400mhz (unlinked of course)
5-5-5-15 2T manually entered
Running a 15:16 ratio

RAM 1.9v
NB - I believe I set it to the lowest (1.4v or something like that)
+100mv offset also enabled
vCore is at around ~1.3v

I do have a different MB though, so some of your settings may be different than mine.

But, that is what I have mine set at.
Your board is based on the NVIDIA chipset which uses a totally different set of bios settings. The Intel boards have a totally different set of dividers and have no "unliked" memory option.

Also the FSB is calculated as straight FSB, there is no reference to the QDR as in the NVIDIA bios.

The Intel P35 NB chipset voltage is much different to the NVIDIA chipset as well. You do not want/need to run 1.5v to the NB. 1.35v should be enough for him to run a 400FSB.
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post #6 of 13
As a side note, CoreTemp and Everest as well as HWMonitor (it will report your maximum temps during stress testing) are good programs for having reports on the temperatures of various components of your system.
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post #7 of 13
Thread Starter 
Yeah I've been using HW Monitor
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post #8 of 13
Oh good...i thought of mentioning it since it has helped me a lot with overclocking
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post #9 of 13
I have had my E6420 for about 10 months or so and I have to say I have been extremely happy with it. I never used the stock cooling, I had a zalman from the beginning and would recommend aftermarket cooling, even if you just get an inexpensive Arctic Cooling 64 Pro ($24):

http://www.newegg.com/Product/Produc...82E16835185125

I have a different motherboard than you so our bios options are different, but in my experience I found the E6420 loves 1333mhz FSB (333x8) 2.67ghz and can run it at a really low vcore, 1.3125v in bios and depending on your thermal solutions runs really cool at this setting. I can go to 1400mhz FSB (350x8) at the same vcore but it runs about 1 deg C higher. To go higher than that requires more vcore. I have had it as high as 3.2ghz FSB (400x8) but that required 1.4+ vcore and will definitely cause higher temps. I kept it at 3.2 for several weeks with no problems but as my ambient temps starting going up (winter is over ) I moved it down until I got a better air-flow case which I have just switched over to. I am in the process of working my way back up and am at the 1400mhz FSB 2.8ghz setting, idling at 30C, orthos load at 40C, COD4 load at 36C.

I also run my ram at 1:1 linked.

Good luck with the 6420 it's a good chip and has served me well!
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by yannis7777 View Post
Oh good...i thought of mentioning it since it has helped me a lot with overclocking
Thanks anyway, took me some time to notice it

I came up with a strange situation. When I entered bios and checked my core voltage, its 1,3500V by default and I can't se it to lower. And with that my core temp was 55C when running Orthos, so does this stop me from overclocking or?
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