I never used it on the console side but we had few pitches for HPC offerings. Back then nobody cared about the GPU but the test runs basically doomed it: the peak performance would have been nice but it required pretty massive rework of each program before the results weren’t bad and we had some memory-latency sensitive workloads which would have suffered horribly. We spent less money on Opterons which were faster on every existing app and since multiple supercomputing systems mixed the two I suspect that was a common decision.