Does Game Streaming Use More CPU or GPU?

When your stream stutters or your game frame rate tanks the moment you hit “Go Live”, the natural question is: which part of my PC is the bottleneck — the CPU or the GPU? The answer depends entirely on how you encode, and knowing it tells you exactly what to change to get smooth gameplay and a clean broadcast at the same time.

The short answer: it depends on your encoder

Streaming adds the job of encoding — compressing your gameplay into a video stream in real time. That work can be done on the CPU (using the x264 software encoder) or on the GPU (using hardware encoders like NVIDIA NVENC, AMD AMF, or Intel QuickSync). Whichever you pick determines where the extra load lands, and that changes the whole calculation.

CPU vs GPU encoding load

If you use hardware encoding (NVENC/AMF)

Modern GPUs have a dedicated encoding block separate from the cores that render your game, so hardware encoding barely touches your gaming performance — often a 1–5% frame-rate cost. In this common setup, streaming leans on the GPU, but only a small, specialised part of it, which is exactly why NVENC is the default recommendation today. Your CPU stays free for the game’s simulation, physics, and input.

If you use software encoding (x264)

x264 runs entirely on your CPU cores and is genuinely demanding, especially at higher quality presets. Here streaming is a CPU job, and a game that also hammers the CPU can leave both fighting for cores. Streamers who insist on x264 for its quality edge usually need many CPU cores or a dedicated second PC to handle it without stutter.

Where games themselves load the PC

Your game’s own demand matters too. GPU-bound games (high resolution, ultra settings, ray tracing) already push the graphics card hard, so adding CPU-based x264 encoding spreads the load and can work well. CPU-bound games (large simulations, strategy titles, high-refresh esports at low settings) already stress the processor, so pairing them with x264 is a recipe for stutter — GPU-based NVENC is the safer match there.

Don’t forget RAM and upload

Streaming and recording simultaneously raises memory use; 16 GB is a practical minimum and 32 GB is comfortable for heavy multitaskers. And none of the encoder talk matters if your upload bandwidth is too low — a 6,000 Kbps stream needs reliable headroom above that. The encoder decides where the compute load falls; your internet decides whether it ever reaches viewers cleanly.

Practical setup advice

If you have a modern GPU, use its hardware encoder (NVENC or AMF), set a sensible bitrate for your upload, and enjoy near-free streaming that leaves your CPU for the game. Only reach for CPU-based x264 if you have cores to spare or a second encoding PC and you are chasing the last bit of quality. Check Task Manager while streaming: whichever component sits pinned near 100% is your real bottleneck.

Frequently asked questions

Does streaming lower my game’s FPS?

With GPU hardware encoding, usually only slightly — often a few percent. With CPU-based x264 on a CPU-limited game, it can drop frames noticeably. Match your encoder to where you have headroom: hardware encode if your CPU is busy, and you will barely feel the streaming overhead.

Is NVENC or x264 better for streaming?

For nearly everyone today, NVENC on a modern GPU is better because it offloads encoding from the CPU with minimal quality loss and minimal frame-rate impact. x264 can look slightly cleaner at a given bitrate but demands far more CPU, which only makes sense with spare cores or a dedicated stream PC.

Bottom line

Streaming uses your GPU if you hardware-encode with NVENC or AMF, and your CPU if you software-encode with x264. On a modern graphics card, choose hardware encoding to keep gameplay smooth at almost no cost. Reserve CPU-heavy x264 for spare-core or dual-PC setups, watch Task Manager to find your real bottleneck, and make sure your upload can carry the result.