Originally posted by Kunzite The accelerator isn't "noise reduction processing".
Ricoh says it's noise reduction officially
Features2 | PENTAX K-70 | RICOH IMAGING
Thanks to the combination of the PRIME MII imaging engine and a newly developed
accelerator unit that effectively
suppresses noise http://www.ricoh-imaging.co.jp/english/products/k-1-2/feature/index.html
To reproduce lively colors and rich gradations close to memory colors in all sensitivity ranges, the PENTAX K-1 Mark II newly incorporates an original
accelerator unit, which efficiently processes image signals output by the image sensor before sending them to the imaging engine. This process upgrades both image resolution and color reproduction in a high-sensitivity range, while
drastically reducing noise compared to the PENTAX K-1. It also helps bring the camera's top sensitivity up to ISO 819200 (at standard output sensitivity) for high-grade, super-high-sensitivity photography
http://www.ricoh-imaging.co.jp/english/products/kp/feature/index.html
By coupling the PRIME IV imaging engine with the exceptional data processing performance of its accelerator unit, the PENTAX KP achieves
high-level noise reduction to realize flawless, high-speed operation as well as super-high-sensitivity, high-resolution imaging.