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kchinger

New Member
I'm trying to get it stable at 4 Ghz. This is my first overclock, and I've been working on it for a couple days but I can't it stable. I've read all the stickies here (as well as everywhere else I can find) and I'm still unsure of how to proceed.

Here's my setup:
Gigabyte P35-DS3L
E8400
4 gigs Corsair Ballistix DDR2 800

Temperatures aren't a problem.

BIOS settings are 445 * 9. CPU voltage is 1.40625, Speedfan reads 1.41 at idle, 1.38 under load. RAM timings are AUTO. FSB and NB voltage are both +0.3 at the moment. DIMM voltage is +0.6, Speedfan reads 2.18. All the power saving and motherboard performance things are turned off.

I hadn't been running my FSB and NB voltages that high, but I tried it to see if it would help any. I tried auto voltages at some point, I don't remember what happened but it wasn't stable I guess.

Right now it runs about 1-2 minutes in Orthos CPU small FFT test before taking a rounding error. I would rather not go higher on the voltage, and I don't think I should have to either.

From what I've read I should be able to get this clock easily with this CPU. Am I doing something wrong or do I just have a not-so-great chip?

Should I just give up and back it down to try to get it stable at this voltage? I really don't want to hurt anything, and I want my stuff to last a couple years if possible. I've had it stable enough to game, but I want to fold with it, so I need it to be 24/7 stable.

Thanks for your time,
Kai
 
BIOS settings are 445 * 9
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if that's true you're already at 4005mhz.
give me all of the specs or just your current mhz reading.

FSB and NB voltage are both +0.3 at the moment
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there is no such thing as fsb voltage

DIMM voltage is +0.6
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if you haven't been oc'ing your memory and your certain you've locked your memory oc'ing options, don't raise the voltage.

you should be able to get it up to 4ghz but it will require some effort.
if i were you i would just up the fsb enough to get it to 4ghz, and raise the voltage to 1.45. if that isn't stable start backing it down with 100mhz at the time and see where it gets stable. Do monitor the temps while your at it.
 
Not all E8400s get there easily. As you can see in my sig, I stopped at 3.95GHz. I had 4GHz stable but I didn't want the temps, vcore or fan volume that came with it so I stayed here.
 
taylormsj said:
Errr yeh there is, FSB termination voltage
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:eek:never heard of it, my bad
just looked up this:
FSB Termination voltage, which is the termination voltage of the host bus but, more importantly, also the bus supply voltage. Intel’s specifications allow voltage levels between 0.83 and 1.65 on the termination buffers, however, keep in mind that the voltage is the same as the bus supply voltage, which is limited to a maximum of 1.29 according to Intel’s specifications. We did find that increasing the FSB termination voltage caused the CPU temperature to increase, at least compared to the “Auto” setting. Consequently, also the CPU throttling kicked in earlier and, particularly in graphics applications, the system had a tendency to freeze, followed by ATI’s VPU recovery message blaming ATI’s drivers.

Keep in mind here that the only thing changed was the manual setting of the FSB termination voltage, while all other system parameters remained identical. On the other hand, the strange behavior of misreporting benchmark results could be completely eliminated, with the caveat that higher bus frequencies required higher termination … er, bus supply voltages. In so far, all of this makes sense now. The Prescott with its much better utilization of the bus puts more strain on the bus itself including the clock domains – which, therefore heat up faster and consequently, need more voltage. On the other hand, a higher bus supply voltage also causes the bus to run hotter and, in addition, may cause more passive power drain from the CPU- which consequently will run hotter and throttle earlier.
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if i were you.. just don't touch it unless you really really feel the urge to :P
 
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