Hey stxfreak,
 
I got a similar rig and having a lot of issues with OCing. I've also got a post in the overclocking section so if someone is able to give me some good advice i'll pass it on. what games are you playing when it crashes? I'll try it out and see if the crash happens to me. I haven't had a crashing problem unless i'm running ubisoft games that really don't like overlays while there games are running.

lol my cards in sli can only get +70 mhz on the core. do u have 1 or 2 cards? does your voltage adjust when you adjust it?

I only got one of them, still not sure if the 130€+ were worth the card. somehow I'm sad that I didnt wait for the kinpgin, just because the bios support etc. will be alot less significant for the classy. I also put a backplate on it and am quite happy with looks and sound of the card, just not the overclocking that i intended to do. precision x seems to work a lot worse than msi afterburner, on ab my fire strike runs went smooth, on precision x the voltage probably didnt adjust as I set it resulting in an immediate crash at the beginning of fire strike.

yeah, I just got artifacts at 120/500 and didnt know if it was the vram oc or the core oc :/
 
#edit: not, I'm quite new to the whole overclocking. Dont got a voltmeter or evbot or anything like that. it just seems that it worked on msi ab because there were no immediate crashes like on precision x.

yeah I know, did that first. everything went fine until 120 mhz on core and 500 on vram ;). I'm currently looking into modding the bios to get a better overvolt. may increase the stability. I'm happy with the default clock though, stable 1417mhz is quite okay (not for the price though if you wont even reach 1500).

On air with custom bios: http://1drv.ms/1yyJ818

255killer instead of showing off why don't you help stxfreak with some info on where you got the bios from and how you flashed it
 

"NVFlash980": http://1drv.ms/1wztX8i

They won't tell you that it's ok to flash a custom bios. They will warranty the card as long as it's in original form. If something goes wrong flash back to original bios and send it in. If it goes horriblely wrong and the card is died guess what they can't do? Check the card.

shaun_style
255killer instead of showing off why don't you help stxfreak with some info on where you got the bios from and how you flashed it
 

That's not showing off. That's actually kind of weak

Yeah man, I learned with the 780 Classified that it's not worth buying them if you're not going to watercool them. I mean, if you want a guaranteed higher overclock, that's cool, but you'll get the same, if not more, from a vanilla card usually. That's been my experience with the last few generations of cards (again, unless you watercool.)
 
My buddy bought a 980 Classy and my vanilla card overclocks higher than his on air. His will be under water soon, however, and with a modded bios he'll far surpass me for sure lol.

Sweet, that would really erase all my concerns with this card. Did it fix the driver crashes you had before without the mod, or didn't you have them either way? I think the problem lays in the power profiles as it does not get enough to power the overclock. If I get a stable 1550 core on air I would be happy. Do you still need to enable kboost all time, or just stock settings?

2097 Mghz for memory before I start getting skipped frames.

Currently running +130 = 1550 core on OC bios all day long playing BF4 no problem   

After deciding not to take the path last weekend it annoys me to hell that i cant even put up +80mhz and go to dekstop out of bf4 and get a driver crash. Is this something that really is an issue with the cards possibility to overclock? heck I even get these errors on stock clock. I really would like to let the card at least run at 1550mhz, but at current state it seems impossible. I would be glad for an update how to flash it, do i need to clear the drivers, save my bios, flash via nvflash and reinstall drivers then? will there be a bios overclock inside the bios or do i still need to oc via precision x? will I be able to hold the overvolt with air cooling, do I need to adjust the fan curve to keep it from throttling? thanks!"