Overclocking an E4300 and C1E and EIST

[Agentbolt]

I'm getting conflicting info about this. When overclocking an E4300 to the point where you go above stock voltage:

A: Do you need to turn off C1E and EIST?
B: If you do, why do you need to?
C: What affect will those things being turned off have on the computer compared to leaving them on when OCing? (Temps, stability, etc.)

Thanks for any help

 

[BlingBlingArsch]

ur sig says u oced ur e4300 @ 3,38ghz...i think u did everything right.

 

[Agentbolt]

Yeah, voltage is at 1.55 to do it though. I've heard EIST or C1E has SOMETHING to do with voltage, so I wasn't sure if not turning those features off is what's causing me to need such a high Vcore to make it stable

 

[myocardia]

Of course it has something to do with voltage. How did you think they make them use less electricity? They reduce the clockspeed a bit, so the processor doesn't need as much voltage, and reduce the voltage to the cpu. That's why you want to always turn off everything like that, anytime you're going for much of an overclock. For instance, if you were only overclocking to 2.4 Ghz, you'd most likely be fine with leaving that stuff turned on. But with a 1.5 Ghz overclock, you're only going to have stability problems.

Of course, raising your vcore in the BIOS isn't going to add stability, at least when C1E and EIST kick in. That's because it's still going to give your cpu the amount of voltage that it's programmed to give it. I can't remember what it is for C2D's, but for A64's, it's 1.1v (although, they run at a much lower frequency when Cool N Quiet kicks in). Most likely the reason you're needing so much voltage is just because you have an E4300 @ 3.38 Ghz. Most people don't take them past 3.0 Ghz. Not because they can't do it, but because of the voltage they require for +3.0 Ghz.

 

[Agentbolt]

Okay, cool, thanks. I think.

 

[Elfear]

I have an E4300 running at 3.0GHz at stock volts with C1E and EIST enabled and it runs fine. Haven't used it much but it has run Blend and SmallFFT for hours on end with no issues. The chip drops to 21-22C at idle when EIST kicks in and than ramps back up again when a load is placed on it.

 

[myocardia]

Originally posted by: Elfear
I have an E4300 running at 3.0GHz at stock volts with C1E and EIST enabled and it runs fine. Haven't used it much but it has run Blend and SmallFFT for hours on end with no issues. The chip drops to 21-22C at idle when EIST kicks in and than ramps back up again when a load is placed on it.

So, how much do you want for it? But, yeah, as long as you don't have to raise the vcore, and still have a little headroom, you don't have to turn it off.

edit: And I'm not completely sure about needing a little headroom, that's really just a hypothesis.

 

[Accord99]

On the Asus P5Bs, and possibly others, once you start overclocking using the BIOS controls, the voltage reduction feature of EIST and C1E gets disabled automatically.

 

[Elfear]

Originally posted by: myocardia

Originally posted by: Elfear
I have an E4300 running at 3.0GHz at stock volts with C1E and EIST enabled and it runs fine. Haven't used it much but it has run Blend and SmallFFT for hours on end with no issues. The chip drops to 21-22C at idle when EIST kicks in and than ramps back up again when a load is placed on it.

So, how much do you want for it? But, yeah, as long as you don't have to raise the vcore, and still have a little headroom, you don't have to turn it off.

edit: And I'm not completely sure about needing a little headroom, that's really just a hypothesis.

It's actually in a rig I'm building for my dad. I got a MATX board that tops out at about 335MHz and that's with the PCI-E frequency set to 120MHz. I'll bet the chip has more left in it but the board is maxed out.

 

[sanitydc]

Originally posted by: Agentbolt
I'm getting conflicting info about this. When overclocking an E4300 to the point where you go above stock voltage:

A: Do you need to turn off C1E and EIST?
B: If you do, why do you need to?
C: What affect will those things being turned off have on the computer compared to leaving them on when OCing? (Temps, stability, etc.)

Thanks for any help

I didn't. Saved me about 100w's in system power. (from 430->300-340)

 

[derubermensch1]

In case someone is still viewing this, I took a C2D E6600 to 3.2 without turning off C1E etc on a evga 680i with voltage on auto. Unfortunately, when I played games, having C1E enabed wouldnt let my processor ramp up again and it forced me to play at like 1.8
I havent tried setting the voltage to stock voltage while overclocking so that might fix it...

 

[amenx]

Just about every OC'ing guide out there says to turn off C1E and EIST when OC'ing. I havent seen an iota of difference when benchmarking, so seems these features work quite well and only go into effect when your CPU is idling or not in heavy use. When called into heavy action (benching, gaming, whatever) they do not impede performance AT ALL. So no need to disable them.

 

[aka1nas]

I imagine the issue is similar to OC'ing with C&Q on a K8 system. When the proc throttles down while OC'ed it may not be stable as the throttling just drops the multiplier.

 

[Xvys]

I have CIE activated on mine and reached 520FSB with my P5B and E6300. Not sure about EIST, I've got PEIT on mine I think? It reduces my cpu temperature reading by 10C when enabled. The cpu multiplier is reduced to X6 at idle, thus lowering the temp. But when I activate SuperPi, for instance, it immediately goes to X7 multiplier, so no loss in performance. Unless you are suffering stability problems I would leave them activated to lower power consumption and temps.