Overclocking an HD 6770

[los]

I know its a really old not so great graphics card, but thought I would have a go at overclocking for when I get my next graphics card, as I'd rather learn on a cheaper one.
I have a GA-970A-DS3 (which isnt good for overclocking and updated to the latest bios) with a FX6300@4ghz. Its an Asus HD6770 on windows 8 64 bit.
Everytime I raise either the core or memory even by 1, the screen flickers at the bottom everytime I do anything, even opening the internet.
I have tried both afterburner and the asus one, installed at different times. I am running Catalyst 13.5 beta 2.
I'm guessing overclocking it probably wont make any noticeable difference, its just I'd like to learn how to do it.
Any ideas?

 

[bells]

Just try moving the sliders in the Catylist software overclocking section

 

[los]

Ok Cheers I will try it tomorrow

 

[los]

Its still the same, any other is ideas?

 

[ArchAndroid]

Install MSi AfterBurner and try overclocking using that program.

 

[los]

That was the first program I used, as thats what most people seem to recommend but it was exactly the same

 

[ArchAndroid]

I suppose the last thing to try would be Sapphire Trixx but I doubt that would work if the others don't.

 

[los]

Ok cheers, I'll give it a go, if it doesnt work think I'll just give up as I cant see it making much difference anyway.

 

[bells]

maybe time for a new card

 

[los]

Oh yes, thats what I was thinking, will wait for the new ones to come out before I make any purchases though