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Is 4ghz possible on a 740BE? - Page 2

post #11 of 32
Thread Starter 
Thanks for the info
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post #12 of 32
Yeah the 720 BE is a C2 revision, I was lucky enough to get it to 3.879 GHz when locked and once unlocked to a quad I was very lucky and got it to 3.716 GHz.

Everything from the 700e to the 740 where all C2 revisions.
post #13 of 32
Yes, all Heka core chips regardless of model are C2 revision chips.
It may be possible to get 4.0 from it but the norm is about 3.6 to 3.8 as stated. My 720 BE has hit over 4.3 and could possibly reach 4.4 but that's yet to be seen. I did though reach over 4.0 with 1.44v's used - My chip is probrably an extreme example of a Heka core so don't read into it so much in comparison to your chip.

Also know Phenom II's tend to be temp sensitive chips. The lower you can get temps, the better.
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post #14 of 32
If you keep it at 3cores, it should be possible. If you want it at 4.0 with 4cores, then you will be going into dangerous voltage territories.
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post #15 of 32
Thread Starter 
I was planning on keeping at x3 so I could monitor temps. I guess all I need to do is increase the multi till it wont boot, then increase the voltage till it will. As long as my temps are below 60 under load, and my voltage doesn't exceed 1.55 I should be good, right?
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post #16 of 32
Quote:
Originally Posted by akshep View Post
I was planning on keeping at x3 so I could monitor temps. I guess all I need to do is increase the multi till it wont boot, then increase the voltage till it will. As long as my temps are below 60 under load, and my voltage doesn't exceed 1.55 I should be good, right?
Bear in mind the higher the multi used, the harder your CPU will work = More heat.
Temps can vary with each chip a little, some run cool while others may get warm or even hot at the same voltage used and the cooling it has will affect this as well. 1.55v's max is a good safety guideline to use but there is no guarantee your chip will stay cool enough at this voltage.

Monitor the chip's temps and go from there, reducing the voltage or multi as needed if temps get too warm. You may also want to play around with undervolting the chip a little to get a real feel for what it needs to boot at a given clockspeed, say 3.6 as a testing point. Then you can bump it up to 3.7 once you find this minimum voltage for a successful boot at 3.6GHz with a small bump in voltage to try a 3.7 boot.
Whatever your max booting speed finally comes up to be, give it another bump in voltage when you find this max to add stability and then test for stability while watching temps.

Remember that the board can shoulder some of the load by raising the bus speed. I've seen chips not boot at 20x 205 = 4.1GHz but would boot at 19x 216 = 4.104GHz since the board was then taking some of the workload to make it boot at that speed. Don't forget about your RAM dividers as well, be sure you're not overspeeding your RAM as you raise clockspeeds.
Try these things and see what happens.
Edited by Kryton - 1/4/11 at 8:38pm
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post #17 of 32
Thread Starter 
Thanks for the info. Ill give it a go and come back when I get it oc'ed or have issues.
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post #18 of 32
Thread Starter 
so far im at 17*210=3.57 @ stock voltage
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post #19 of 32
Thread Starter 
what would you recommend for stability tests
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post #20 of 32
Quote:
Originally Posted by akshep View Post
what would you recommend for stability tests
I have an obsessive personality... so I use prime95 for 15+ hours.
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