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My experience with turbo core overclocking

post #1 of 11
Thread Starter 
Okay so right off the bat I am using turbo core because I cannot get my FSB stable beyond 275 MHz. Old MSI board got me to ~300Mhz. I have tried more NB voltage and nada.

Okay so I got my overclock up to the highest stable FSB speed I could get, and then used turbo core beyond that. I know that I could previously not get the processor completely stable around 4150-4200 GHz, although I'm not 100% whether it was the CPU or FSB that was the problem.

Anyway so with that in mind, this is where I stand. I am not concerned so much with voltage as when I have time I will kick it down a notch or two and continue stressing. I am on the system listed. CPU is on water & added VRM sinks.

Regular overclock - 275x14=3850 GHz, ~1.48v
Turbo overclock - 275x15=4125 GHz, 1.6v
2750NB & 2750HT links (I read that the Thubans like running the HT link with the NB freq and have had no problems thus far)
DDR2 @900 ish 5/2T (will run @ 1000MHz CAS 5, but cannot get CAS to 4 @ 900MHz)

So any ideas for pushing this setup higher? Any tricks for getting the FSB speed higher (I would probably disable turbo core if I could get my OC to 4GHz)

Stability was tested by running prime for several hours on all 6 threads. This basically disabled turbo core since when the CPU is under heavy/100% load, it runs all the cores at 3850/~1.48-1.5v
I then also ran prime for several hours on 1 thread, which enabled turbo core randomly on all 6 cores @ 4125/1.55-1.6v

I can say for sure that it works most of the time, because unless the CPU is under ridiculous stress, at least a few cores get OC (and sometimes all 6 run @ 4125). Seems like the more stress, the less cores get overclocked.

I didn't go too much into benching, but here are some basic results -

Ran Dragon Age II with coretemp/overdrive/cpu-z on another monitor and I can confirm slightly higher frame rates and turbo core kicking in all the time.

1m SuperPI score jumps to 16.5 seconds from over 17.

Thanks for looking!




Here is what a quick 6 thread prime looks like

Here is what a quick 1 thread prime looks like

Edited by madmanmarz - 3/26/11 at 9:55am
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post #2 of 11
I wouldn't run turbo core when overclocking or you will hit ridiculous voltages without controlling it properly.

HT-link at 2750 wouldn't help stability very much. Good NB speed.

1.568 V @ 3850 = no good.
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post #3 of 11
Turn Turbo Core off... I once accidentally ran 1.675V through my chip thanks to turbo core
Also, what happened to your original MSI? Did it take a blow?
post #4 of 11
Thread Starter 
3850 = 1.48v and it increases voltage only to the turbo cores when needed, seems hella stable as far as I have seen. Pretty sure I can get this down to 1.45 but I think it failed at 1.425.

Usually hits 4125 around 1.55v but sometimes gets up near 1.6v. Since it swaps around the turbo cores, it seems to me like it keeps the temps down like this.

Does not go over 1.58/1.6v at all and hardly ever above 1.55v

Anyway not worried about voltages at all right now until I'm 100% satisfied with the overclock. I know turbo core is finicky as hell but this doesn't seem too bad to me.. unfortunately it seems this chip in particular needs a ton of voltage to get stable, which is probably why it was open box =/

Just wanna get the clocks up some way or another =/
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post #5 of 11
Thread Starter 
Alright I got things down to 3712@1.425v and turbo @ 4125@1.525v.
3850ghz is not stable @ 1.425 and 4125ghz IS stable at 1.525 so I just reduced my regular multi, and decreased voltages and my super PI are still under 17s. @3850 super pi was at 17.9/18.

What would you say is the max volts you'd run through high end water cooling? Looks like people are saying 1.525 but if I can bump up to 1.55 or so I would probably be able to get 4200s stable.
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post #6 of 11
You should be fine at 1.55 with high-end water cooling.

Just don't set to 1.55 in bios and enable turbo, it'll end up at 1.65 or something ridiculous.

Monitor your temps/voltage closely and you should be ok.
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post #7 of 11
Thread Starter 
I guess my motherboard is ass backwards because if I set it to 1.55 with turbo, it runs between 1.45-1.55. =D no complaints
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post #8 of 11
What exact 785G model is this?
As far as I know all the Gigabyte 785G boards ever released had cheap unheatsinked 4+1 phase of the 2007-2008 design which had known problems.... I'd consider overclocking an x6 on this board this far really unwise
post #9 of 11
Thread Starter 
it's definitely as cheap as a 785g board gets. using until I get my replacement board back. i like it but if the vrms blow ill still have the other board to go back to. i put copper sinks on the vrm and my case temps are really low (everything's on water and rads are outside) so i guess it's better than nothing.

it's a ma785gm-us2h rev3.3..no idea what the DOM is
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post #10 of 11
The coppers sinks should really help. I wonder what happened to the MSI board though... was it a VRM blow?
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