| GPU | NVIDIA GeForce GTX 1080 Ti | NVIDIA GeForce GTX 1660 Ti |
| Microarchitecture | Pascal | Turing |
| H.264 NV_ENC_CAPS_SUPPORT_FIELD_ENCODING | Yes | No |
| H.264 NV_ENC_PRESET_HP_GUID entropyCodingMode | NV_ENC_H264_ ENTROPY_CODING_MODE_ CAVLC | NV_ENC_H264_ ENTROPY_CODING_MODE_ CABAC |
| H.265/HEVC NV_ENC_CAPS_NUM_MAX_BFRAMES | 0 | 5 |
| H.265/HEVC NV_ENC_CAPS_SUPPORT_TEMPORAL_AQ | No | Yes |
Apart from the capabilities, a whitepaper mentions these H.265/HEVC improvements:
Turing GPUs also ship with an enhanced NVENC encoder unit that adds support for H.265 (HEVC) 8K encode at 30 fps. The new NVENC encoder provides up to 25% bitrate savings for HEVC and up to 15% bitrate savings for H.264.