What is the benefit of running a NoSQL database on POWER8 with CAPI rather than on x86?

A.
Shared memory and cache for dynamic tuning

B.
Easy Tier on FlashSystem storage

C.
More memory DIMMs slots per processor

D.
Up to 80 threads in the 4U server drawer

Explanation:
IBM’s CAPI innovation on POWER8 systems is possible because of a dedicated silicon area on the chip that
enables a client-defined hybrid-computing engine to act as a peer to the multiple POWER8 cores on the chip.
The unit on the POWER8 chip, called the coherent accelerator processor proxy (CAPP) unit, participates
directly in the POWER8 core coherency protocols on behalf of the acceleration engines (AFU). The CAPP unit
maintains a directory of all cache lines held by the off-chip accelerator, allowing it to act as the proxy that
maintains architectural coherence for the accelerator across its virtual memory space.References: Coherent Accelerator Processor Interface (CAPI) for POWER8 Systems White Paper (29
September 2014), page 5

https://www-304.ibm.com/webapp/set2/sas/f/capi/CAPI_POWER8.pdf