GPUs and i7 CPUs have radically different design philosophies. The i7 has great performance per core and giant caches, while the GPU has lots of (relatively) sl

GPUs and i7 CPUs have radically different design philosophies. The i7 has great performance per core and giant caches, while the GPU has lots of (relatively) slow cores with tiny caches, and effectively only SIMD-instructions. For simple, highly parallelized floating-point number crunching nearly any GPU will blow your i7 out of the water, no matter how you program your i7. Only a tiny fraction of the surface area of the i7 has stuff useful for that task, but GPUs are designed for that works. Conversely, any GPU will be absolutely terrible at running Microsoft Word.