ATi tool error

[error8]

Ok, so I'm trying, again, to oc my videocard's memory. But in ATi tool I get this message" delta 22 in one pixels" after some minutes of scanning, with the memory at 3800mhz.
Now, I know that error should be considered as an artifact and probably the clocks are too high. But what bugs me, is that the scanning still continues, the timer doesn't reset itself and I have no visual artifacts in ATI tool or any other game, Furmark, 3dmark and even OCCT . I don't experience any crashes or problems after hours of gaming. Only ATi tool gives me this message. So, I'm wondering if this is an ATi tool problem or the card really is unstable. What do you think?

 

[legcramp]

lol I just pencil modded my 4850 right now @ 770mhz on the core, atitool gave me the error just now bumped down 5mhz and been running for over 7 minutes.

Runs furmark fine though @ 770mhz, I am aiming for furmark stable + atitool stable for at least 10 minutes on both then an hour of COD5 or crysis etc etc for the overclock to be declared 100% stable.

 

[error8]

My error comes up after some 15-40 minutes of artifact scanning. Furmark runs like a dream though for 1 hour. I really don't know what to think about this.