Weird I am in the same version and hit the limit at 900/1325. Is your card not allowed to go any higher or is it just not stable?
EDIT: I think I just figured it out!
Go to computer -> Local Disc C: -> program files x86 -> MSIAfterburner.cfg
Change
[ATIADLHAL]
UnofficialOverclockingEULA =
UnofficialOverclockingMode = 0
TO
[ATIADLHAL]
UnofficialOverclockingEULA = I confirm that I am aware of unofficial overclocking limitations and fully understand that MSI will not provide me any support on it
UnofficialOverclockingMode = 1
Save the cfg file and restart MSI Afterburner. I no longer have the limits of 900/1325 on my 6950!