Overclocking a 55nm GTX 260

[ISI300]

Hi. I'm currently running a GTX 260 Core 216 55nm with the new P0654 pcb. I modded it to run with 1.18 MHz (up from 1.12) core voltage through Bios and overclocked it to run @720/1550/1150 (744/1600/1161 also possible, but got it toned down a bit just to be on the safe side.). Do you think it's harmless to run it at this state without modifying Fan settings?
or is it safe to use default bios fan setup at this state?
(Case side open, two 80mm one intake (under the hard disk bit) the other exhast (under PSU, nest to cpu cooling).

BTW, anyone know if there's any way to push voltages beyond or is this it?
here's the mod http://www.evga.com/forums/tm.aspx?m=152847&mpage=1&print=true

 

[Asylum]

Just keep a eye on your temps and you will be fine.

As long as your not running it at 75c and above 24/7 you should be fine.

I think that is as high as the voltage will go far as i remember.

 

[ISI300]

As long as your not running it at 75c and above 24/7 you should be fine.
.

It doesn't. a few minutes ago I was playing dirt 2 and GPU-Z showed a 84 on the core, and 61% was the highest the fan went.

 

[catnipkiller]

set the fan on 100% if your trying to over clock. I still have my 260 @ 750core 1200mem if i can remember.

 

[ISI300]

set the fan on 100% if your trying to over clock. I still have my 260 @ 750core 1200mem if i can remember.

I've tried different fan settings and flashed it through bios but none were bearable and they didn't go past 75%, let alone 100%. can you give me some numbers to try in nibitor?

 

[catnipkiller]

i was able to get 750 core on stock volts on my bfg card stock clock are 590. My shader clock was unlocked i think i could only do 1500 shader and 755 core.

 

[ISI300]

i was able to get 750 core on stock volts on my bfg card stock clock are 590. My shader clock was unlocked i think i could only do 1500 shader and 755 core.

Then why could I only set the core with default voltage to 712, but shaders would go all the way up to 1584?

 

[arnoo1]

My gtx275 runs 70c @70% and thats on stock clocks 633mhz xd so 85c 24/7 is allright

 

[ISI300]

A thought just popped into my mind, would low core frequencies effectively bottleneck shader performance?