I don't think they will run much warmer. But I do think they'll be freakin expensive. 2x16 GB should also be faster than 4x8 GB at the same timings (due to the dual rank topology).
That's what I was wondering. Is 2x16GB really faster than 4x8GB even in dual rank mode? The downside is that 2x16 have higher latency too. Only 4x8 come in CL14-15-15-35.
Prices wise yeah, they aren't getting cheaper. I've heard also Samsung discontinued B-die RAM now.