I have stock everything on my CPU and it runs @ 31c idle, 40-45c under load.
GPU is a 6770, normal. Runs 40c idle, 60-68c under load.
But true, it is not all in one.
Actually, go look at the benchmarks in todays games for a 7770. What you see on the X1 is just what you would expect from a bandwidth starved 7770. 7770's can barely run 30fps / 1080p in todays games if you want to keep fidelity up. You either drop resolution, keep some fidelity ( still have to compromise ), or keep resolution and drop fidelity quite a bit.
So far devs seem to be dropping the resolution.
For example, here is Crysis 2 ( ! ) attempting max details @ 1080p on the 7770.