News ASRock Challenger Arc B570 lands in the hands of user a month before launch — Reportedly sips just 10W of power at idle and runs a handful of games...

15 Xe2 units reported is odd. No amount of bit-shifting or memory layout changes turn an 18 into a 15, so the report showing that is very suspicious.

That sounds like a low-end GPU, like a B380?
 
15 Xe2 units reported is odd. No amount of bit-shifting or memory layout changes turn an 18 into a 15, so the report showing that is very suspicious.

That sounds like a low-end GPU, like a B380?
The 570 has 15 units. The user was trying to get a 580 to work, which has 18 units. I think he managed to get a 570 driver installed and that's why 3 units are disabled.

We are talking about hand-adjusted drivers here, so there's no need for a memory layout change or bit shifting to be a factor. Just hard limits that the end user didn't try to get around.