Second monitor, fuser or capture card: how to see the overlay
There are three ways to get a DMA radar or ESP in front of you. We compare them on cost, added latency, complexity, resolution and refresh ceilings, and how each one fails.
Short answer
The three options are a second monitor on the second PC, a fuser that mixes both PCs' video, and a capture card. The second monitor is the cheapest and easiest to wire, but only a fuser puts the overlay on your main screen.
On this page9
- What does the display path change?
- How do the three paths compare?
- How the second monitor path works
- How the fuser path works
- How the capture card path works
- What does each path need before you order?
- Does the display path affect detection?
- How to choose a path, in order
- Common questions about choosing a path
What does the display path change?
The card reads memory on the game PC, and the second PC turns that memory into a picture. The display path is the last link in that chain: how the picture reaches your eyes. It does not change what the card reads or what the game receives. It changes where you look, what it costs, and how much delay sits between the game state and the image you see, so choose it on ergonomics and budget.
How do the three paths compare?
Read the resolution column first, because it decides whether a purchase was a mistake, and it is also the column people check last.
| Path | Cost shape | Added latency | Complexity | Resolution and refresh limit | How it fails |
|---|---|---|---|---|---|
| Second monitor | A display you may already own. No special hardware. | None in the game's video path. Only the radar itself lags, by the read-and-render pipeline. | Lowest. Two video chains that never meet. | Whatever the second PC's output and that monitor support. No shared ceiling. | Barely fails at all. The real cost is that your eyes leave the game to read the radar. |
| Fuser | A dedicated box, cables and a power supply. The most expensive path. | Whatever the box adds to the game PC's signal. ReportedVendors publish very low figures — confirm the model with the seller. | Highest. Three video legs in a fixed order, mains power, and an EDID the box has to present correctly. | Set by the fuser, not by your monitor. This is the ceiling people discover after buying. | Black screen, wrong resolution, or refresh capped below the panel. Usually EDID or cable order. |
| Capture card | A USB capture device. The cheapest way to get game and overlay in one frame. | Tens of milliseconds on the captured copy. The loop-out leg is unaffected. | Middle. One extra video leg, capture software, and an EDID chain that may now run through the device. | Capture is commonly limited to 1080p60 on cheap devices even when loop-out passes 4K60. | You end up watching a delayed, downscaled copy of your own screen. Also mode-locking from the device's EDID. |
The fuser is the easiest of these three paths to buy wrong. A monitor you already own cannot have the wrong ceiling for this job, and a capture device's capture limits are on the listing if you read past the loop-out figure. A fuser's limits are set by its model string, which sellers in this market name inconsistently.
How the second monitor path works
The second PC drives its own display, so the radar lives there and your main monitor is untouched. No signal from the second PC ever enters the game PC's video path. That leaves nothing to misconfigure and nothing adding delay to the picture you play on. The cost is attention, because a radar you have to look away to read is a radar you read less often. Most people on this path put the second display low and to one side, and some use a small panel rather than a full monitor.
How the fuser path works
A fuser is a hardware video mixer with two inputs and one output. The game PC's output goes into one input, the second PC's output goes into the other, and the box's single output goes to your monitor. It composites the second PC's image over the game image and sends one signal onward, so the overlay lands on the screen you are already looking at. Because the box is now part of the game PC's video chain, it needs mains power, a valid EDID to present upstream, and a specific cable order.
How the capture card path works
A capture device on the second PC accepts the game PC's HDMI output as a video input. The second PC shows that feed in a window and draws the overlay on top, so your eyes stay on one screen, the second PC's. Your main monitor keeps its own direct cable or runs from the capture device's loop-out. This is the cheapest way to see game and overlay together, but it costs you a live image, because what you watch is a delayed and usually downscaled copy.
What does each path need before you order?
Start with the last row, because it holds the number that every ceiling gets compared against.
- Second monitor
- A spare display and one video output on the second PC. Nothing else
- Fuser
- A model whose published ceiling covers your monitor's mode, two cables to the box, one to the monitor, a free output on each PC, and a mains socket
- Capture card
- A device rated for the mode you want to watch, a spare video output on the game PC, a rear USB 3 port on the second PC, and capture software
- All three
- A second PC that is already reading the card. A display problem on top of a dead read path is two problems, diagnosed as one
- Your monitor's real mode
- The resolution and refresh rate you actually run today, not the panel's marketing maximum. Write it down before you shop
Warning
Does the display path affect detection?
The choice is close to detection-neutral because it decides where the picture lands, not what the game PC observes about the card, the input device or how you play. One real technical point sits under the market's talk about screenshots, and it concerns where compositing happens. A fuser mixes downstream of the game PC's frame buffer, and a capture path draws the overlay on the second PC. In both cases, the game PC's own capture path has nothing extra in it. Anything that composites on the game PC first can be captured there, including a software overlay, a display the game PC itself drives, or a virtual display. That is a statement about pixels, not about safety. No display path makes a setup undetectable, and nobody should sell you one on that basis.
How to choose a path, in order
- Write down your monitor's real resolution and refresh rate
- Decide whether looking away from the game is acceptable, because if it is, the second monitor path is all you need and it costs nothing extra
- If it is not, choose between accepting a delayed copy of your screen with a capture card and paying for a live composite with a fuser
- For a fuser, get the seller to confirm in writing that the exact model's ceiling covers your monitor's mode
- For a capture card, confirm the capture resolution, not just the loop-out resolution
- Budget for cables: a fuser needs three good ones, and the bundled cables are the ones to test with first
Common questions about choosing a path
Which path do most people use?
A second monitor, because it costs nothing extra and cannot be wired wrong. People who buy a fuser want the overlay on their main screen and accept an extra box in the game PC's video chain to get it.
Does a fuser reduce my frame rate?
It does not change what the GPU renders, but it can change which mode the GPU is allowed to output. The fuser presents the EDID that the game PC reads, so a box that tops out below your monitor's refresh rate will cap you there.
Can I use a capture card and a fuser together?
There is no reason to, because they solve the same problem in two different ways. Some fuser listings advertise an integrated capture function, but that is a convenience feature rather than a combined path.
Is the second monitor path worse for anything except ergonomics?
No. It adds nothing to the game PC's video chain, and there is no shared refresh ceiling and no EDID to get wrong. That makes it the path with the fewest ways to fail.
Can I run the radar on my phone instead?
Yes, if your software exposes a web radar, and that needs no fuser and no capture card. The web radar guide explains how it works and what exposing a local port on your network means.
Sources
The judgements on cost, delay and ceilings come from building all three paths ourselves, not from a published document.
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