I go to a top 30 liberal arts college in the US, and I'm planning to go on a study-abroad for one year. I want to go for a Computer Science PhD after I graduate. I will be a Math major with a scientific computing concentration since my college does not have a CS major -- we have some classes like "intro to CS, data structures, software development, coding theory, comp organization, software & system design" but those are all when it comes to CS classes. Therefore, I am looking to go abroad for a year and take all of the core CS classes and many more -- like database systems, algorithms, compilers etc.
One downside that could come into play is that these classes that I take abroad won't count towards my college GPA although the grades will be posted. To elaborate, I will get transfer credit and the grades I earned in these classes will be shown in my transcript, but they just won't count towards my GPA. Is this going to hamper my PhD admissions? Will it be a bad idea to go abroad for a year in this scenario? I also have summer research in Information Theory that went quite well (we have three papers in arXiv that we aim to get published.)