An 80mm Rad? I'm not aware of many of that size.... and if you're proposing cooling the CPU+GPU off a single 80mm Rad, I can't see that going well.
GPUs that are water cooled (via AIOs) typically ship with 120mm units which, while a little overkill, are fairly fit for purpose.
An overclocked 3570K, similarly, would be fine with it's own 120mm Rad.
Combined, I'd suggest a minimum 240mm. 80mm, I highly doubt is going to cut it.