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Voltage limits?

post #1 of 9
Thread Starter 
I've seen people talk about lowering their voltages when they OC to get a stable OC for their FSB changes and discussions about lowering your voltage to as little as possible.

While I understand that the lower the voltage, the lower the heat, I've seen people say that a 1.5v isn't good for your processor. But the box that my e6420 came in says that the max voltage is 1.65v.

So, why is that high of a voltage unsafe for a CPU when it's well below the maximum threshold? Is it just increased heat? Or is that upper limit something that you don't want to maintain - sort of like running your car at constant redline?

I'm currently running my e6420 at 2.8ghz. I'm pretty sure that my voltage in the bios is set to 1.65v but when I look at CPU-Z, it shows something like 1.25v (I'm at work right now and can't check). My temps are right about 42c on Orthos load when it's cool inside my house, but with the heat wave lately, they've been closer to 45-46c, which doesn't seem bad to me.
     
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post #2 of 9
Quote:
Originally Posted by e_dogg View Post
I've seen people talk about lowering their voltages when they OC to get a stable OC for their FSB changes and discussions about lowering your voltage to as little as possible.

While I understand that the lower the voltage, the lower the heat, I've seen people say that a 1.5v isn't good for your processor. But the box that my e6420 came in says that the max voltage is 1.65v.

So, why is that high of a voltage unsafe for a CPU when it's well below the maximum threshold? Is it just increased heat? Or is that upper limit something that you don't want to maintain - sort of like running your car at constant redline?

I'm currently running my e6420 at 2.8ghz. I'm pretty sure that my voltage in the bios is set to 1.65v but when I look at CPU-Z, it shows something like 1.25v (I'm at work right now and can't check). My temps are right about 42c on Orthos load when it's cool inside my house, but with the heat wave lately, they've been closer to 45-46c, which doesn't seem bad to me.
1.65vore is a killer indeed IMHO. Default for C2D should be around 1.3250vcore. Your BIOS is definitely not running at 1.65vcore. You probably need water or phase to run at that and you can acheive a overclock of 3.8GHz or something.

My default 2.13GHz - 1.3250vcore
My Overclock - 2.9GHz - 1.14vcore

If your vcore is set on Auto, I recommended manually setting it.
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post #3 of 9
If the box says that, then I believe it´s ok. But the higher the voltage, the more shorter the life of CPU will be. But nobody´s gonna use a CPU more than 8 years I believe.

And your voltage of 1.65 is correct, CPU-Z reads it just wrong.
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post #4 of 9
Quote:
Originally Posted by Desperado1987 View Post
If the box says that, then I believe it´s ok. But the higher the voltage, the more shorter the life of CPU will be. But nobody´s gonna use a CPU more than 8 years I believe.

And your voltage of 1.65 is correct, CPU-Z reads it just wrong.
Impossible! He/she will have killer temps at that vcore. You should go check your BIOS. If you're running at 2.8GHz, you can probably run it at 1.3250vore or lower. Manually set it to that.
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post #5 of 9
it's mainly heat that makes volts dangerous.
post #6 of 9
Quote:
Originally Posted by TaiDinh View Post
Impossible! He/she will have killer temps at that vcore. You should go check your BIOS. If you're running at 2.8GHz, you can probably run it at 1.3250vore or lower. Manually set it to that.

I know, but I believe I´ve sayd that already to him at another thread...if it was hi
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post #7 of 9
Quote:
Originally Posted by TaiDinh View Post
Impossible! He/she will have killer temps at that vcore. You should go check your BIOS. If you're running at 2.8GHz, you can probably run it at 1.3250vore or lower. Manually set it to that.

I know, but I believe I´ve sayd that already to him at another thread...if it was him
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post #8 of 9
Thread Starter 
I'm pretty sure that it's not set to "auto" in the bios - I want to say that it's 1.3 or 1.4 (or thereabouts since it's a dropdown list) but I can't remember...and I can't check since I'm at work. I do know that I had to raise it from what I initially had it at to in order to get it to post at 2.8fsb but I can't remember what that setting was.

I just saw some mention of voltages as I was cruising OCN and the question struck me.

EDIT: Just saw someone else's post mentioning their e6420 using 1.625v - that's what mine says too...not 1.65
     
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post #9 of 9
Here is a list of some of the E6420 overclocks.
Quote:
E6420:
L630B khurios 3.5@1.35 4@1.585
L644G Betrivent 3@1.35
L645G ckp64 3.6@1.575
L646G bluedevil 3.6@1.5
L646G pjlietz 3.5@1.48
L646G cyant 3.52@1.52 bios, 1.48 actual
L646G murcielago585 3.6@1.5 3.7@1.53v
L649G Skywayman 3.0@1.35
L649G sam95ta 3.1@1.31
L649G ChielScape 3.36@1.45 set 1.42 idel 1.38 load
L650C mentholmoose 3.24@1.48
L652B CMH 3.408@1.3875
L704A ocelot11 3.2@1.35 set
L709A Tweak 3.2@1.375
L709A NCSpecV81 3.7@1.52
3713A Cyph3r 3.13@1.4
CPU-Z will not tell you the exact temp that is shown in your BIOS. BIOS is the only thing I would trust. You're probably running around 1.4v. I doubt it's currently set at 1.65v
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