20:47:24:312 ab4 GPU #1: Pitcairn, 2048 MB available, 16 compute units
20:47:24:315 ab4 POOL version
20:47:24:315 ab4 b331
20:47:24:316 ab4 Platform: Windows
20:47:24:438 ab4 start building OpenCL program for GPU 0...
20:47:24:443 ab4 done
20:47:24:544 ab4 Frontend phase failed compilation.
Error: Compilation from LLVMIR binary to IL text failed!
20:47:24:545 ab4 16x binary failed, try 15x
20:47:24:567 ab4 start building OpenCL program for GPU 0...
20:47:29:620 ab4 done
20:47:29:864 ab4 start building OpenCL program for GPU 1...
20:47:29:871 ab4 done
20:47:29:972 ab4 Frontend phase failed compilation.
Error: Compilation from LLVMIR binary to IL text failed!
20:47:29:974 ab4 16x binary failed, try 15x
20:47:30:005 ab4 start building OpenCL program for GPU 1...
20:47:35:032 ab4 done
20:47:35:287 ab4 GPU #0 algorithm 2, intensity 6
20:47:35:322 ab4 GPU #1 algorithm 1, intensity 6
What motherboard? Do you have 16GB of virtual memory set?
I think this is a memory or driver issue.