When i do faster than 1m 02s 507ms the result is invalid, not matter what i use (2.1, 2.1.1, 2.1.2, 2.2). Using 2 different OS (Windows 7 x64 & Windows 10 x64). FYI i use AMD APP SDK 3.0, AMD Crimson Software 15.11. Maybe i do something wrong or any info? Thanks before