Which one is recommended: NVidia GRID K1 or GRID K2?

[ZahyGabi]

As per the datasheet ( https://www.nvidia.com/content/cloud-computing/pdf/nvidia-grid-datasheet-k1-k2.pdf ) , the K1 has 4 Kepler-GPUs with 4x4 GB DDR3 VRAM (and 768 total CUDA cores); the K2 has only 2, but hig-end Kepler GPUs with 2x4 GB DDR5 VRAM (with 3072 CUDA-cores). Which one is better if I mostly want to use them with stable-diffusion.cpp (and sometimes - very rare - to some llama.cpp based chat, and whisper.cpp) on Linux. Are they recommended at all? (These are fanless "GPU-accelerator-cards" - from the past, using the 470-based driver, and cuda-v11.)