Capture via a Second PC: What Components You Need for a Dedicated Streaming Machine

Why Have a Second Computer at All

The two-machine setup solves one problem: splitting the load. The gaming PC handles the game and outputs the finished picture, and the streaming machine receives it, encodes it, and sends it to the platform. The game doesn't drop frames because of the encoder, and the stream doesn't stutter when a heavy scene hits in-game. Below is what to put inside the second machine so it handles exactly this role.

CPU: How Many Cores You Actually Need

The streaming machine encodes and does almost nothing else. If you go with software x264, the entire CPU budget goes to the encoder, and the rule here is: more threads means a higher preset without drops. A modern eight-core chip with good multithreading is a reasonable starting point. Six cores can also handle a stream, but there's less headroom for the preset, and at medium preset plus high resolution you'll hit the ceiling.

If you encode in hardware, the CPU requirements drop: six cores is enough, and sometimes fewer, because a dedicated block on the GPU does the main work.

NVENC, QuickSync, or x264

The codec choice determines where to put your money, so decide this before buying.

• x264 on the CPU gives the most flexible control over quality and bitrate, and it handles complex scenes with fine detail and fast motion better. The price is an expensive multi-core processor and a high load on it.
• NVENC on NVIDIA graphics cards is a hardware encoder that barely touches the CPU. Quality on current generations is close to the medium x264 preset, and the system load is minimal. The limitation is that the card must be recent: on older chips the encoder falls behind noticeably.
• QuickSync on Intel integrated graphics is a compromise: hardware encoding without a discrete card, and the integrated GPU handles a stream at typical resolutions. But quality and the range of settings are more modest than NVENC, and on CPUs without graphics this path isn't available.

In practice, NVENC is more often chosen for a streaming machine: it offloads the CPU, so you can get a cheaper processor and put the difference into a capture card or network. x264 is chosen when picture quality at high bitrate matters more and you have the budget for a powerful CPU.

GPU: What Matters Beyond the Encoder

Gaming performance isn't needed here. The card serves two purposes: it provides the hardware codec and outputs the image to the preview monitor. A lower-tier discrete model from the current generation is enough — codec support in drivers lasts longer on recent cards than on old flagships.

If you encode only with the CPU, you can get a very basic graphics card — just as long as it has a monitor output. The downside is obvious: without a hardware encoder you can't offload the CPU in a heavy scene and won't have a fallback if the x264 preset starts hitting the ceiling.

Memory and Storage

16 GB is enough for the system, OBS, a browser with chat, and overlays. More makes sense if you keep many scenes and sources and record locally at the same time. Pick the frequency your platform can hold stably: record-breaking isn't needed on a streaming machine.

The system goes on an SSD. For local stream recordings, use a separate drive: recording at high bitrate writes a lot and fast, and you shouldn't share that stream with the system. A second drive adds to the budget, but without it the recording and the system get in each other's way.

Capture Card: The Key Node of the Setup

This is how the picture from the gaming PC gets to the streaming machine. There are two options, and each has a downside.

• An internal card in a motherboard slot. It gives a stable signal and doesn't take up USB, but it requires a free slot and space in the case, and sometimes separate power.
• An external USB card. It's simple to connect and moves between machines, but it's limited by USB bandwidth and sensitive to cable and port quality.

Look at the supported resolution and refresh rate, the presence of passthrough, and driver support for your system. Cheap models often can't handle high modes and add latency to the preview.

What to Feed Into the Capture Input

The signal comes from the gaming graphics card's output. It's convenient when it has two outputs: one goes to the gaming monitor, the second to the capture card. If there aren't enough outputs, people use a splitter, but that's another part that can degrade the signal or add latency. Check the resolution and refresh rate at the output: the capture card must accept them without conversion.

How to Link Two Machines: Three Methods

Besides a capture card there are other options, and each has its downside.

• A capture card in passthrough or regular input mode. The most stable and predictable path, but it requires buying a card and cables.
• NDI over the local network. OBS on the gaming PC sends the stream to the streaming machine, and no HDMI cable is needed. The price is network traffic: a gigabit cable is desirable, and stability depends on local network load and quality settings.
• Software screen or window capture at the OS level. Cheap and without hardware, but it puts a big load on the gaming PC and gives an unstable picture in dynamic scenes.

For regular work, the "capture card + cable" combo is most often used, and NDI is connected as a backup or second channel.

Network: Cable Matters More Than Plan Speed

For streaming, stability is critical, not the peak number from the provider's ad. A wired connection is preferable to Wi-Fi: the wireless channel introduces fluctuations that show up in the stream as bitrate jumps. If the streaming machine is far from the router, budget for a separate network card or running a cable.

The uplink must handle your bitrate with headroom: the stream may go not only to the platform but also to a second service or to a network backup recording. Local disk recording doesn't depend on the uplink — it doesn't go over the network. The downside of the wired setup is that the cable physically limits where the machine can stand.

Case, Cooling, Power

The streaming machine runs for hours under CPU load. Budget for a proper tower cooler or a quality liquid system — on a stock cooler the processor will hit its temperature limit and start dropping the preset. Get a case with airflow: if it stands next to the gaming PC, both need air intake.

The power supply should have power headroom and a proper efficiency certification. A quiet PSU matters just as much: the microphone picks up fan hum, and the streaming machine sits close to the workspace. The downside of headroom is overpaying if you build a system noticeably weaker than calculated.

Peripherals and Small Things

• A preview monitor: you don't need an expensive one, a working screen for chat, scenes, and audio levels is enough.
• Keyboard and mouse: simple ones will do, since you don't control the stream often.
• Audio path: game sound comes through the capture card, while voice, music, and alerts live on the streaming machine — think through how to mix it all together.
• Cables: the length and quality of HDMI and USB directly affect signal stability, so don't skimp on them.

Budget Tiers and Where to Cut

Exact amounts depend on the market and region, but the cost ratio is roughly the same.

• Minimum: a six-core processor, a simple card with a current hardware codec or Intel integrated graphics with QuickSync, 16 GB of memory, one SSD, an external USB capture card. Hardware encoding.
• Optimum: an eight-core chip, a card with NVENC, a separate drive for recordings, an internal capture card, a wired network. There's headroom both for x264 at medium preset and for a hardware codec.

The most expensive node is the processor, and cutting costs there is the riskiest move if you chose x264. With hardware encoding, it makes more sense to put money into the capture card and network and get a more modest CPU.

Alternatives to a Dedicated Build

A second PC isn't the only path. A standalone hardware encoder box or an external card with its own encoder is cheaper than a full build and takes the load off the gaming machine, but they offer less flexibility in scenes and settings: some of what OBS on a second PC does out of the box, the box can't do.

You can also leave encoding on the gaming PC via the graphics card's hardware encoder. It's free, but with a heavy game and high bitrate the picture quality will be lower than with a dedicated CPU encoder on the second machine, and drops in heavy scenes will affect both the stream and the game.