[short_circut]

I have a graduate physics degree and I am working on a second one. As far as I can tell so far you will be quite competitive with CS graduates, though you may have to start off at a lower position than some. The other thing is you will have to know exactly what kind of job to apply for and have skills specific to that area. No matter what I think you should have a good grasp of optimization and vectorization of algorithms as well as knowledge of parallell and massively parallell programming. The programming jobs that I have seen that want physicists tend to want them to make math do very complicated things very quickly. The other thing people want physicists for is to model complex systems. There is no shortage of people who want physicist for that. Sharpen your mathematical programmign skills. You don't necessarily need to be able to optimize for that but it will make you look better and earn you better references.