It seems that a lot of GPU problems revolve around specific versions of drivers. Though AMD has their own support structure, you can often learn from information reported by others who fold.
There is too little information to see if there is a problem. However, the client will not give a good estimate for PPD or final points award until several percent of a WU is completed. Also there is no value in setting the checkpoint value to the minimum of 3, and in any case the GPU folding Core_17 does not use that value in determining when to write one. That checkpoint frequency is set by the researcher running the GPU project.
It would be useful to see the beginning of the log where it shows the client version information, the system configuration and the folding configuration. You can display that in the client by clicking on the Refresh button, or by copying and pasting from the log.txt file in the F@H data directory.
iMac 2.8 i7 12 GB smp8, Mac Pro 2.8 quad 12 GB smp6
MacBook Pro 2.9 i7 8 GB smp3
Hardware configuration: Intel i7-4770K @ 4.5 GHz, 16 GB DDR3-2133 Corsair Vengence (black/red), EVGA GTX 760 @ 1200 MHz, on an Asus Maximus VI Hero MB (black/red), in a blacked out Antec P280 Tower, with a Xigmatek Night Hawk (black) HSF, Seasonic 760w Platinum (black case, sleeves, wires), 4 SilenX 120mm Case fans with silicon fan gaskets and silicon mounts (all black), a 512GB Samsung SSD (black), and a 2TB Black Western Digital HD (silver/black).