ASUS Radeon 5850 HD Overclocking help!

SYSTEM:
CPU: Intel Core 2 duo E8500 (3.16GHz 6MB 1333Mhz)
RAM: Corsair TWIN2X PC8500 DDR2 (Kit w/2x 2GB 1066MHz)
OS: Windows 7 Ultimate (x64 bit)
OS HDD: Western Digital Green caviar
Random 750W PSU

firstly, whomever posted that youtube video is an idiot.

all chips are different, and what works for some may not work for others (and can even be dangerous)

you need to make sure you know how overclocking works, and exactly what you are doing. overclock in increments and stability test while constantly monitoring temps. dont just go whacking up the voltage, thats how you fry a GPU.

some chips cannot overclock at all (very few, but it can happen) and others can get insane overclocks. they are all different. the scale of circuitry makes consistency impossible.

now what settings have you tried?

all i could say is read some guides, or esle break something. make sure to download MSI Kombustor, HW monitor, GPUz and whatever OCing tool you prefer (i use MSI afterburner)

and again, overclock in increments, check temps and run a stress test before trying the next clock increase. raise voltage only as needed, and every time you do be sure to monitor temps carefully.

I have tried:
800 Core x 1200 Memory x 1.15 Vcore
And some others. They all worked at IDLE a long time but got fucked up when i tried "stresstest".
I hope its possible to get it up to 800 / 1200 or 5870 values.

I use FurMark as "stresstest" and check's the temp with SmartDoctor by ASUS
I'll download the rest of them asap :]

Any tips?