GTX 580SOC

Gigabyte GTX 580 SO (Super Overclock, also called SOC).

Read more about the card here: http://www.hexus.net/content/item.php?item=30204&page=1

My overclocing experience, from memory:

Complete computer crash, vertical lines all over the screen.

Memory has been pushed too far, try upping the memory voltage - might need a more than you think so keep going.

Lots of triangles on the screen, and weird graphics

GPU needs more voltage. Up the voltage and it should disappear. Cool GPU better or freeze it to archieve better performance with less volts.

Computer locks

Heat issue, maybe on the PWM chips. Your GPU isnt willing to go higher under present conditions. Your GPU might be 40C, only but thats still too much for to run stable. Try too cool it harder.

WATERCOOLED

and on OC setting

3dmark 06: link

3dmark vantage: link

3dmark 11: link