What a dual PC setup does and why streamers use it

A dual PC setup means running two computers side by side: one to play the game or run the process, and a second one to record or stream that video. The Elgato Capture Card is the hardware that sits between them, taking the video signal from the first PC and sending it to the second one so the second PC can broadcast it without slowing down the game.

The reason streamers and content creators do this is straightforward: recording or streaming uses CPU power. If you try to do both on one machine — run a demanding game at high settings and encode video at the same time — the game stutters, the stream drops frames, or both. Splitting the work across two PCs means the gaming PC stays fast and the streaming PC stays focused on just sending video out to the internet.

An Elgato Capture Card handles the handoff. It plugs into the gaming PC's graphics card output (usually HDMI), reads that video signal, and passes it to the streaming PC over a USB cable. The streaming PC then sees the game as if it were a camera pointed at a monitor — which is exactly what it is.

Key Takeaways

  • The gaming PC outputs video through HDMI to the Elgato Capture Card, which converts that signal into data the streaming PC can read over USB.
  • The streaming PC receives the game video as an input source in streaming software like OBS, the same way it would receive a webcam feed.
  • You need HDMI cables, a USB 3.0 or USB-C connection between the card and streaming PC, and streaming software on the streaming PC to make the setup work.
  • The gaming PC does not need streaming software or internet bandwidth — it only needs to output video, so it stays fast and stable.
  • Audio from the gaming PC must be routed separately, either through a second audio cable or by mixing it in the streaming software on the streaming PC.

How video flows from the gaming PC to the streaming PC

The gaming PC's graphics card outputs HDMI video to a monitor or TV as usual. Before that video reaches the monitor, you plug an HDMI cable into the Elgato Capture Card instead (or in addition to the monitor, depending on the model). The capture card reads that HDMI signal — the same pixels the monitor would display — and converts it into digital data.

That data travels over a USB 3.0 or USB-C cable from the capture card to the streaming PC. The streaming PC's operating system recognizes the capture card as a video input device, similar to how it would recognize a USB webcam. Streaming software on the streaming PC — usually OBS Studio, Streamlabs OBS, or XSplit — can then add that video as a source, just like adding a camera or screen recording.

The streaming PC encodes that video (compresses it into a format the internet can handle) and sends it to Twitch, YouTube, or wherever you are broadcasting. Meanwhile, the gaming PC has no idea any of this is happening. It just outputs video the way it always does.

What hardware you need to connect the two PCs

Start with the Elgato Capture Card itself. Elgato makes several models — the HD60 S+, the 4K60 Pro, and others — each with different maximum resolutions and frame rates. The HD60 S+ handles 1080p at 60 frames per second and costs less; the 4K60 Pro handles 4K video but costs more and requires a more powerful streaming PC to encode it. Choose based on what resolution and frame rate your gaming PC outputs.

You need an HDMI cable from the gaming PC's graphics card to the capture card's HDMI input. You also need a USB 3.0 or USB-C cable (depending on the capture card model) running from the capture card to the streaming PC. USB 3.0 is fast enough for most setups; USB-C is faster and cleaner if your streaming PC has it.

The gaming PC should have a second HDMI output so you can still see what you are playing on a monitor while streaming. Many graphics cards have two or more HDMI ports, or you can use a DisplayPort-to-HDMI adapter. If your gaming PC only has one video output, you can run the capture card's HDMI output to a monitor, but then you are watching compressed video with a slight delay — not ideal for competitive play.

The streaming PC needs to be reasonably powerful. It does not need to be a gaming machine, but it should have a modern multi-core CPU (Intel i7 or AMD Ryzen 5 or better) and at least 16 GB of RAM. The capture card itself does not encode video — the streaming PC does that work — so a weak streaming PC will struggle to send smooth video to Twitch even if the gaming PC is powerful.

Setting up the capture card in streaming software

Once the hardware is connected, open your streaming software on the streaming PC. In OBS Studio, click the plus icon under Sources and select Video Capture Device. A dropdown menu appears; select your Elgato Capture Card from the list. OBS will start showing the game video in the preview window.

Adjust the resolution and frame rate in OBS to match what the gaming PC is sending. If the gaming PC outputs 1080p at 60 fps, set OBS to the same. Mismatched settings cause stuttering or dropped frames. You can also crop the video, add overlays, or resize it in OBS before it goes out to the internet.

In Streamlabs OBS or XSplit, the process is similar: add a new source, select Video Capture Device, and pick the Elgato card. Each software has slightly different menus, but the concept is the same — the capture card appears as an input source you can add to your scene.

Routing audio from the gaming PC to the stream

Video is only half the signal. The gaming PC also outputs audio — game sounds, voice chat, music — and that audio needs to reach the streaming PC and the internet.

The simplest method is to run a 3.5 mm audio cable (or USB audio cable) from the gaming PC's headphone jack or audio output to the streaming PC's line-in jack. The streaming PC then sees this as an audio input, and you can add it as an audio source in OBS or your streaming software. This way, game audio and voice chat both travel to the stream.

Some Elgato Capture Cards have an audio input jack on the card itself, so you can plug the gaming PC's audio directly into the card, and the audio travels to the streaming PC over the same USB cable as the video. Check your capture card's manual to see if it has this feature.

A third option is to use software on the gaming PC to send audio over the network to the streaming PC, but this adds complexity and latency. The physical cable method is more reliable for streaming.

Why the gaming PC stays fast even under load

The gaming PC is only doing one job: running the game and outputting video. It is not encoding that video, not uploading it to the internet, and not running streaming software. The CPU and GPU stay focused on the game, so frame rates stay high and the game stays responsive.

This is the core advantage of a dual PC setup. A single powerful PC can theoretically do both jobs, but in practice, streaming software and video encoding consume enough resources that the game suffers. With two PCs, the gaming PC can run at maximum settings without compromise, and the streaming PC handles the broadcast work in the background.

The trade-off is cost and space. You need two computers, two monitors (or one monitor and a capture card passthrough), and cables running between them. For casual streamers, a single PC with lower game settings might be enough. For competitive gamers or streamers who want high-quality broadcasts, the dual PC setup is worth the investment.

Common problems and how to fix them

If the streaming PC does not recognize the capture card, check that the USB cable is plugged into a USB 3.0 port (usually blue inside), not a USB 2.0 port. USB 2.0 does not have enough bandwidth for video. Also restart both PCs and the streaming software.

If the video in OBS is black or shows "no signal," make sure the HDMI cable is firmly connected to both the gaming PC and the capture card. Try unplugging and replugging it. If the gaming PC is outputting to a monitor at the same time, some graphics cards need you to set the capture card as the primary display in Windows settings for it to work.

If the stream is dropping frames or stuttering, the streaming PC is likely underpowered. Close other programs on the streaming PC, lower the bitrate in OBS (which reduces quality but uses less CPU), or upgrade the streaming PC's CPU or RAM. You can also lower the resolution or frame rate you are streaming at.

If audio is missing from the stream, check that the audio cable is connected and that OBS has the audio input selected as a source. In OBS, go to Audio settings and make sure the audio device is set to the correct input. Test the audio by playing something on the gaming PC and watching the audio meter in OBS move.

Frequently Asked Questions

Do I need a capture card if I am just recording, not streaming live?

No. For recording, you can use built-in tools like NVIDIA ShadowPlay or AMD ReLive on the gaming PC, or screen recording software on a single PC. A capture card is mainly useful for streaming because it offloads the encoding work to a second PC. For recording, a single PC is usually enough.

Can I use a laptop as the streaming PC?

Yes, as long as it has a USB 3.0 port and enough CPU power. A modern laptop with an Intel i7 or AMD Ryzen 5 can handle streaming. Avoid older or budget laptops, which may overheat or struggle with encoding. Make sure the laptop has good ventilation and is plugged in during streams.

What if my gaming PC only has one HDMI port?

You can use a DisplayPort-to-HDMI adapter to add a second output, or you can run the capture card's HDMI output to your monitor. The second option means you see the game with a slight delay (the time it takes the capture card to process the signal), which is not ideal for competitive games but works for casual streaming.

How much latency does a capture card add?

An Elgato Capture Card typically adds 30 to 100 milliseconds of delay between the game on the gaming PC and what appears on stream. This is noticeable to viewers but not usually a problem for streamers, since you are watching your monitor directly, not the stream. For competitive games where you need to react to chat, the delay can feel odd.

Can I stream to multiple platforms at once with a dual PC setup?

Yes. The streaming PC can send video to Twitch, YouTube, and other platforms simultaneously using OBS's multistreaming feature or a service like Restream. The dual PC setup does not limit where the video goes — it just handles getting the video from the gaming PC to the streaming software.