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QuantumX

Reaching 4GHz with E7300

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I've been overclocking my E7300 and I've reached 3.95GHz (395mhz x 10) at 1.5V in the bios (1.488v CPU-Z).

 

I ran intel burntest @ 4.0GHz with 1.48375 BIOS volts, and temps were hitting 82 degrees, but 5 rounds was completed with no errors.

 

I decided to use prime95 instead for I was uncomfortable with the cpu running 82 degrees with intel burntest. I ran small FFts to stress the cpu.

The 8k tests completed without errors, but when the 10k tests starts one of the cores gives an error. Temps were 62 degrees at highest ( I use Realtemp for monitoring temps)

So I restarted and raised the voltage to 1.5V in the BIOS. Still the same happned with Prime 95.

I used SetFSB to lower the FSB to 395MHz thus lowering the overclock to 3.95GHz. Its been running without errors since.

 

I am looking for advice on how to tweak the advanced voltage settings in the BIOS eg. CPU GTL reference voltages and CPU PPL voltage, and also the CPU clock skew. I need to get that extra 0.05GHz!! I am not comfortable going over the 1.5V I am at now. The rest of my computers specs is in my signature.

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you are running 82 degrees and you want to increase the voltage? :wacko:

I think you will need to go water to get any higher and the return on the investment is very bad especially considering your CPU model. Also I think you are in the danger zone. *theme song plays and Tom Cruise walks in*

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Are you sure you applied the right amount of thermal paste or how's the airflow in the case? That temp seems a bit high being under the Ultra 120 Extreme.

Edited by PingoPongo

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The airflow in my case is very good, I have 4 120mm fans, 1 140mm fan and one 120mm on the cooler.

I played Crysis at those voltages and speed, temps didn't even hit 50 degrees.

It's only when I'm doing stress testing that temps go over 50 degrees, I still think the Ultra 120 is doing an exellent considering the high voltage I'm running.

 

What buggers me is that Intel Burntest didn't give errors even at 82 degrees, but prime95 fails at 62 degrees... :glare:

 

And maybe if I can tweak the advanced voltages I can lower the main cpu voltage.

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I'd trust the Prime95. What fan are you using on the heatsink, maybe add a second one?

Edited by PingoPongo

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I'm using an Antec tricool running at 2000RPM.

 

I recently rotated the heatsink to face upwards, thus exhausting the air out the top 140mm fan.

Before I did this I had 2 120mm fans on the heatsink exhausting to the back 120mm fan, but it ran about 3 degrees hotter that way.

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Well yea at 4GHz and 1.5v its about 150W and a nice load of heat. Are you sure you can't run it with lover voltage?

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When I run it at 3.7GHz only 1.38V is neccecary, but from there I need a huge increase of voltage to get a small amount of MHz.

 

At the end I don't know if its worth it :huh:

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When I run it at 3.7GHz only 1.38V is neccecary, but from there I need a huge increase of voltage to get a small amount of MHz.

 

At the end I don't know if its worth it :huh:

 

All my processors have been similar to this. Like currently I'm running 3.2 @ 1.34 but anything higher and I have to go balls nuts with all my voltages, partially becuase of my memory and I know that.

 

My 2180 and 4400 we're both the same way, my 2180 wouldn't go over 3 without a jump from 1.3 to 1.5, and my 4400 wouldn't go over 3.25 without going from 1.43 to 1.6. Both time I kept it the max setting with the lowest +v for 24/7 running.

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What about increasing the NB or RAM voltages?

Edited by PingoPongo

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I would not consider 1.5V safe at all on 45nm C2D. Do not be surprised if one day you get random bluescreens; your CPU will have been damaged by the high voltages and it won't be able to hold the same clocks anymore.

 

It did this to me on my E7300, where with 1.8V it would not reach 4.5GHz anymore. Also my E6750 did the same thing when I was running it around this 1.5V, at 3.somethingGHz 24/7.

Edited by The Smith

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I've set it back to stock frequency, and undervolted it!

It's now runnig @ 1.05V in the BIOS and 1.032V in CPU-Z.

Hope this gives it a few years extra lifespan. :lol::P

 

Load temps is only 10 degrees hotter than the idle temps when running Intel Burntest :thumbs-up:

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