Talk:GPU

Nvidia architectures

Afaik Nvidia did never official mention SIMD in their papers as hardware architecture, with Tesla they only referred to as SIMT.

Nevertheless, my own conclusions are:

Tesla has 8 wide SIMD, executing a Warp of 32 threads over 4 cycles.

Fermi has 16 wide SIMD, executing a Warp of 32 threads over 2 cycles.

Kepler is somehow odd, not sure how the compute units are partitioned.

Maxwell and Pascal have 32 wide SIMD, executing a Warp of 32 threads over 1 cycle.

Volta and Turing seem to have 16 wide FPU SIMDs, but my own experiments show 32 wide VALU.

Smatovic (talk) 11:46, 18 April 2021 (CEST)

SIMD + Scalar Unit

According to AMD papers every SIMD unit has one scalar unit, Nvidia seems to have SFUs, special function units. Smatovic (talk) 11:47, 18 April 2021 (CEST)