JtR 1.7.9 with Jumbo 6 now offers GPU support for computationally intensive (slow-hash) password encryptions like WPA-PSK. This POST will detail compiling JtR with OpenCL support. I have an really old ATI Radeon HD card but it works with OpenCL so here goes. This compile works for Ubuntu LTS 12.04 and 10.04. You should read the doc file README.opencl for notes for more info on how to compile JtR with OpenCL support.