What a dual PC setup does and why streamers use it

A dual PC setup means running two computers side by side: one for playing the game or running the application, and another dedicated solely to encoding and broadcasting the video stream. The Elgato Capture Card sits between them, taking the video and audio output from the gaming PC and feeding it into the streaming PC so the streaming PC can process and send it to Twitch, YouTube, or another platform.

The reason this matters is CPU load. When you stream from a single PC, your processor has to do two jobs at once: run the game at high frame rates and encode video in real time. That split attention tanks your game performance. A dual setup lets each PC focus on one job, so your gaming PC can push 144 frames per second while your streaming PC handles the encoding without stealing resources from gameplay.

The Elgato card is the hardware bridge that makes this possible. It captures the HDMI output from your gaming PC and presents it to your streaming PC as if it were a camera or webcam. Your streaming software on the streaming PC then sees the capture card as just another input source.

Key Takeaways

  • The gaming PC outputs video and audio via HDMI to the Elgato Capture Card, which converts that signal into data the streaming PC can read.
  • The streaming PC receives the video feed through the capture card and uses streaming software like OBS Studio to encode and send it to your platform.
  • You need an HDMI cable from gaming PC to capture card, a USB cable from capture card to streaming PC, and a second monitor or display for the gaming PC so you can see what you are playing.
  • The capture card handles the handoff between machines; your streaming software on the streaming PC treats it as a video source, the same way it would treat a webcam.
  • Elgato cards come in different models with different maximum resolutions and frame rates, so check your card's specs to know what quality you can stream at.

The physical connections you need

Start with the gaming PC. Connect an HDMI cable from your graphics card's HDMI output (or your motherboard's HDMI if you are using integrated graphics) directly to the HDMI input on the Elgato Capture Card. This is the video signal coming out of your game.

Next, connect a USB cable from the Elgato Capture Card to the streaming PC. This is how the capture card sends the video and audio data to the streaming machine. Most Elgato cards use USB 3.0 or USB 3.1, so use the fastest USB port available on your streaming PC — usually a blue or red USB port on the back of the motherboard.

You also need a display connected to the gaming PC so you can actually see the game while you play. This can be a monitor, TV, or second HDMI output from your graphics card. The capture card is only sending data to the streaming PC; it is not displaying anything on its own.

If your gaming PC has audio output separate from HDMI (a 3.5mm jack or optical output), you can connect that directly to the streaming PC's audio input for cleaner sound. If you are using HDMI audio, the capture card will pass that through to the streaming PC automatically.

How the video signal flows through the system

When you start your game on the gaming PC, the graphics card renders the frames and sends them out via HDMI. The Elgato Capture Card intercepts that HDMI signal. It does not block or delay it — the signal still goes to your monitor so you see the game in real time. The capture card simply reads a copy of that signal.

The capture card then converts the HDMI data into a format the streaming PC can understand and sends it over USB. On the streaming PC, your streaming software (usually OBS Studio, Streamlabs OBS, or Elgato's own Stream Deck software) sees the capture card as a video input device, similar to how it would see a USB webcam.

You add the capture card as a source in your streaming software, just like you would add a camera. The software displays a preview of what the capture card is sending. From there, you can resize it, add overlays, mix in your microphone audio, and send the final stream to Twitch or YouTube.

The key difference from a single-PC setup is timing. There is a small delay — usually 100 to 200 milliseconds — between what you see on your gaming monitor and what appears on the stream. This is normal and expected. You do not see this delay because you are looking at your own monitor, not the stream.

Setting up the streaming software on the streaming PC

Install OBS Studio (free, open-source) or another streaming software on your streaming PC. When you open OBS, go to the Sources panel and click the plus icon to add a new source. Select "Video Capture Device" from the menu.

A dialog will appear asking you to choose which video device to use. Your Elgato Capture Card should appear in the dropdown list. Select it. OBS will then display a preview of what the capture card is sending — you should see your game.

Adjust the resolution and frame rate in OBS to match what your capture card is sending. If your gaming PC is running at 1080p 60fps, set OBS to the same. If you try to stream at a higher resolution or frame rate than the capture card is receiving, you will get a black screen or stuttering.

Add your microphone as an audio source in OBS, set your streaming platform (Twitch, YouTube, etc.) in the Settings menu, and you are ready to go live. The streaming PC will encode the video from the capture card and send it out.

Which Elgato capture card models do what

Elgato makes several capture card models, each with different maximum specifications. The Elgato HD60 S+ handles up to 1080p at 60 frames per second and costs around $150. It is the most common choice for console and PC streamers who want solid quality without paying for features they do not need.

The Elgato 4K60 Pro captures up to 4K at 60fps, but it is more expensive and requires a more powerful streaming PC to encode 4K video in real time. Most streamers do not need this unless they are streaming to a platform that supports 4K or they are archiving gameplay footage.

The Elgato HD60 X is a newer model that also does 1080p 60fps but with lower latency and better color accuracy. It is positioned between the HD60 S+ and the 4K60 Pro in price.

Check the specifications of whichever model you own or are considering. The max resolution and frame rate listed on the box is the ceiling for what you can stream at. If your gaming PC is outputting 1440p 144fps but your capture card only supports 1080p 60fps, the card will downscale the signal automatically.

Common problems and how to fix them

If OBS shows a black screen when you select the capture card, first check that the HDMI cable is firmly connected on both ends. Then restart OBS. If the screen is still black, restart the gaming PC — sometimes the capture card needs the gaming PC to boot after it is connected.

If you see the game on your monitor but OBS shows nothing, the capture card may not be getting power. Check that the USB cable is plugged into a powered USB port (not a USB hub that is not powered). Some Elgato cards also have a separate power connector; make sure that is plugged in if your model has one.

If the stream is stuttering or dropping frames, your streaming PC may not be powerful enough to encode the video in real time. Lower the bitrate in OBS (try 6000 kbps instead of 8000 kbps) or reduce the resolution. You can also close other programs running on the streaming PC to free up CPU resources.

If there is a long delay between your game and the stream (more than a second), check that your internet connection is stable. A dual PC setup adds a small delay by design, but excessive delay usually means your upload speed is too low or your bitrate is too high for your connection.

Frequently Asked Questions

Do I need a capture card if I am streaming from one PC?

No. A single PC can stream directly to Twitch or YouTube using OBS without a capture card. The capture card is only useful when you want to separate the gaming and streaming workload across two machines. If your single PC is powerful enough to game and stream at the same time, you do not need one.

Can I use the capture card to record gameplay instead of streaming?

Yes. OBS can record the video from the capture card to a file on your streaming PC's hard drive without sending it anywhere. This is useful for archiving gameplay or creating edited videos later. The recording quality depends on your streaming PC's storage speed and available disk space.

What if my gaming PC does not have HDMI output?

Some older graphics cards use DisplayPort instead of HDMI. You can buy a DisplayPort-to-HDMI adapter (around $10 to $20) and connect that to the capture card. Make sure the adapter is active, not passive, for best results.

Does the capture card add lag to my game?

No. The capture card reads a copy of your HDMI signal; it does not intercept or delay the signal going to your monitor. You see the game at normal speed. The only delay is on the stream itself, which viewers see, not you.

Can I stream at higher quality if I use a dual PC setup?

Not necessarily. Your stream quality is limited by your internet upload speed and the bitrate you set in OBS, not by whether you use one or two PCs. A dual setup lets you stream at higher quality without your game stuttering, but if your internet only supports 6 Mbps upload, that is your ceiling regardless of your hardware.