Is this kernel safe to use ?
Right, 7xxx GPU's require SDK 2.6 or higher and ckolivas' modified diablo kernel. That is in the FAQ section of the readme and CGMiner thread top post, now that you reminded me. Good call.
So yes it is safe to that kernel.
Are you good to go now?
Sam
Edit: Still seems kind of low compared to the other cards in the comparison list.
I was in error, again, it's poclbm that ckolivas modified, you probably should be using it or diablo. This from the FAQ in the CGMiner top post
-----------------------FAQ-----------------------------
Q: Which AMD SDK is the best for cgminer?
A: At the moment, versions 2.4 and 2.5 work the best for R5xxx and R6xxx GPUS.
SDK 2.6 or 2.7 works best for R7xxx. SDK 2.8 is known to have many problems.
If you are need to use the 2.6+ SDK or R7xxx or later, the phatk kernel will
perform poorly, while the diablo or my custom modified poclbm kernel are
optimised for it.
Q: Which AMD driver is the best?
A: Unfortunately AMD has a history of having quite a few releases with issues
when it comes to mining, either in terms of breaking mining, increasing CPU
usage or very low hashrates. Only experimentation can tell you for sure, but
some good releases were 11.6, 11.12, 12.4 and 12.8. Note that older cards may
not work with the newer drivers.