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Quick Answer
The best GPU for simultaneous streaming and gaming is the RTX 4070 or RTX 4070 Super. NVIDIA's NVENC encoder produces stream quality comparable to x264 Medium without using CPU resources. The RTX 4070 handles 1440p gaming + 1080p streaming without frame drops.
NVIDIA's NVENC hardware encoder is the reason streamers overwhelmingly choose GeForce GPUs. NVENC produces excellent quality with zero CPU overhead, meaning your game performance is unaffected while streaming. AMD's encoder has improved but still trails NVENC in quality.
The RTX 4070 Super handles 1440p gaming at 80+ fps while encoding a 1080p60 stream via NVENC with zero performance impact. NVENC AV1 encoding produces smaller file sizes than H.264 for Twitch and YouTube.
Same NVENC encoder as the 4070 Super. Slightly lower gaming performance but identical streaming quality. The best balance of gaming power and streaming capability for the price.
If you want to game at 4K while streaming at 1080p or 1440p, the 4080 Super has the headroom. NVENC handles the encoding effortlessly at any gaming resolution.
The RX 7800 XT's AMD VCE encoder has improved significantly. It is acceptable for casual streaming but not recommended for professional streamers who need the best quality. OBS Studio's AMF encoder support is improving but NVENC is more mature.
Our Verdict
The RTX 4070 or 4070 Super is the streamer's sweet spot. NVENC handles encoding with zero gaming impact, and the GPU has enough power for smooth 1440p gameplay. Always choose NVIDIA if streaming is a priority.