Capitalism isn't an ideology. The term was coined by Marx to denote what he opposed, and encompassed basically any society that's both industrialised and allows having "means of production" as personal property. Basically, it's a slur. In marxist ideology, there's no such thing as a half-capitalist or a half-socialist state.

But then again, marx is not the founder of socialism as a movement. Most self-described socialists outside the ol' eastern bloc aren't marxist and usually don't question the right of property as such, either. So going by that, it's possible to reconcile the two. But like Lemur said, it all depends on the definitions of the terms.