Yes small cooler chips are more efficient for sure, but bigger chips that get alot more power per chip are cheaper.
You're confusing size with density. "GH per chip" is size. "GH per mm^2" is density. Density means you get more hashrate per wafer. Size of the chip is meaningless.
The amount of GH per Wafer has a direct affect on the GH per chip which goes into the price of a chip and eventually into the price of a unit.
If you have 1 wafer that can make 100 chips and each chip is 10gh or 1 wafer for 100 chips and each chip at lets say 50gh, the second chip you have a better shot at turning a profit on.
In your comparison all that matters is that one wafer has 1000 gh/s and one has 5000 gh/s.
Using big chips is only detrimental because it requires $150 worth of watercooling for each chip compared to small chips which require ~$20 worth of extruded aluminum per KW for cooling.
You don't need watercooling if you are using AM's immersion cooling. Big hot chips like HF's are perfect for Novec.
Many small chips require many more components, raising the total device cost and chance of failure.
If AM doesn't buy HF's 16nm design and stick 100,000 of them in datatanks ASAP, they will be crushed by KnC, BitFury, and Cointerra before the next block reward halving.
i think a helluva lot of due diligence is going to have to be done regarding those chips.
I doubt it's as clear cut as you think it might be. interesting to know who does finally buy the rights tho... interesting times indeed.
