This definitely worked on my 7950s under BAMT/Ubuntu with catalyst 12.6 (8.98)

But strangely it did not affect my 7970 in the slightest.

Here are the previous attempts to tweak scrypt.cl

https://litecointalk.org/index.php/topic,4082.0.html

https://litecointalk.org/index.php/topic,6020.0.html

which didn't work for me at all - but yours did

Note how they had to make a different version for 13.4+ and pre-13.4

The 7950s went from 610-611  to  620-625   so roughly a 2% performance increase.
On rare occasion I've noticed the rate bounce down to 610 but climb back up.
Watching the longer term WU to see what happens.

I'm curious why the 7970 is not affected at all, I only have a single thread running.

If you'd like some dogecoin as a thank you, let me know your address.