This guide covers the practical version: what an iGPU can do, how to enable it, where it falls short, and what to check first.
The premise: a weak iGPU is still a useful iGPU
Rozario uses an RTX 4090 with a Ryzen 7 9800X3D. He describes that chip's iGPU as tiny, with just two graphics cores. It won't rescue AAA gaming if the 4090 dies. His point is that gaming isn't the only job a GPU does. An iGPU can also handle video playback, encoding and extra display output, and it can help you troubleshoot.
His own gaming figure is modest and attributed to him: he reports averaging around 200 FPS in Valorant at 1080p on low settings on the 9800X3D's iGPU. That is one author's test. Treat it as a data point for a light esports title, not a promise for your setup.
He also says AMD's Ryzen 7 8700G, which has a Radeon 780M iGPU, can run games like Cyberpunk 2077 and Red Dead Redemption 2 at playable frame rates. The article gives no settings or resolution for that claim, so read "playable" loosely. Settings, memory speed and drivers all matter.
Step by step: using motherboard video ports alongside a graphics card
Prerequisites
- Your CPU must actually include graphics. Many desktop chips don't, and the motherboard's video ports do nothing without one. Check the exact CPU specifications.
- Your motherboard must expose HDMI, DisplayPort or USB-C video outputs on the rear I/O.
1. Connect the extra monitor.
Plug your secondary display into a motherboard port. Keep your main gaming monitor on the discrete card.
2. Enable the iGPU in BIOS/UEFI if needed.
Intel's support guidance says most motherboards disable the iGPU by default when a discrete GPU is installed. It says you can enable it in the BIOS, and the two will then work together. Intel points users to their motherboard manual for the iGPU Multi-Monitor setting.
ASUS documents example paths, and they vary by board:
- On an AMD example board, enter BIOS Advanced Mode, open the Advanced page, then NB Configuration, and set IGFX Multi-Monitor to Enabled.
- On an Intel example board, the path is Advanced > System Agent (SA) Configuration > Graphics Configuration, then set iGPU Multi-Monitor to Enabled.
- Save with F10 and restart. ASUS says the setting takes effect after the reboot.
Don't treat those menus as universal. ASUS's own page notes that some AM5 boards and Intel 800-series boards may not show the option, because dual display is the default there. Other vendors use different names, such as IGD Multi-Monitor or Internal Graphics, and sometimes different menus. A Windows 11 forum thread also shows that Intel boards may offer a Primary Display choice (Auto, CPU Graphics, PEG Slot or PCIe) alongside the multi-monitor toggle. Check your board's manual for the exact label.
3. Install drivers and check Windows.
ASUS's troubleshooting advice is to open Device Manager and confirm that both the integrated and add-in graphics drivers are installed. It also warns that installing the integrated graphics driver while a discrete card is attached can throw an error if multi-monitor isn't enabled in the BIOS.
4. Choose a display mode.
Press Win+P. ASUS lists four modes:
- PC screen only
- Duplicate
- Extend
- Second screen only
For a secondary monitor, Extend is usually the one you want.
What success looks like: both monitors show a picture, Windows lists both adapters, and Task Manager can show two GPUs. Rozario's setup uses exactly this arrangement, with the secondary display on the iGPU.
Common failure points
- No iGPU option in BIOS. The CPU may not have graphics, or the board may handle it automatically.
- No signal from the motherboard port. Recheck the BIOS setting. Also confirm you're plugged into the board and not the card.
- Driver install error. See the ASUS note above.
- Option vanishes after an update. One guide advises re-enabling the multi-monitor option if the iGPU disappears after an update.
The troubleshooting angle
A working iGPU gives you a second display path. If your discrete card stops sending a signal, a monitor on the motherboard port can help you separate a bad card from a bad system. Rozario also recalls a two-week gap between selling an RTX 3090 and receiving his 4090. His 5800X3D had no iGPU, so his PC was unusable.
Caveat: this isn't a guarantee. It depends on a working iGPU, the board's video circuitry and the BIOS settings. If the iGPU was never enabled and the discrete card is dead, you may have to remove the card to reach the BIOS option. One tutorial for an ASUS board describes the option appearing after unplugging the card. So enable it before you need it.
Media engines: the quiet bonus
Rozario highlights hardware-accelerated encode and decode. Intel's specification for the Core Ultra 9 285K lists Quick Sync Video and hardware encode/decode for H.264, H.265 and AV1. It also lists four Xe-cores and a 2 GHz maximum graphics frequency, and says the chip supports up to four displays.
HandBrake's documentation lists Intel Quick Sync, NVIDIA NVENC and AMD VCN as hardware encoders. It also says HandBrake disables a hardware preset when the matching hardware or drivers aren't detected, or are outdated. So check the encoder menu in your app before assuming the iGPU is being used.
There is a trade-off. HandBrake's performance documentation says hardware encoders are very fast but come at the expense of some quality and larger files. It suggests software encoding such as x264 for the best balance of speed, quality and size. Offloading to an iGPU frees your main GPU and CPU for other work, but it isn't automatically the best-looking output.
Adobe documents hardware encoding in Premiere as an export setting. Support depends on the codec, version and hardware, so confirm what your install supports.
The costs: memory, power and overhead
Rozario lists the downsides honestly:
- An iGPU has no dedicated VRAM. It may reserve some system RAM, even when idle.
- The CPU may draw a bit more power and run hotter when the iGPU is in use.
- Using both GPUs at once, such as rendering on the card while the iGPU encodes, can add CPU overhead and latency from moving frames between them.
His conclusion is that merely enabling the iGPU is not a dealbreaker. If it sits idle while you game, he doesn't expect noticeable overhead. If it's busy, he says you might lose a few frames. That's his judgment, not a controlled test.
On memory, qualify the "reserves RAM" idea. Microsoft's driver documentation describes dedicated video memory, dedicated system memory and shared system memory as separate categories. It gives a formula capping the system memory available for graphics at the smaller of 80% of total, or the larger of total minus 16 GB and 50% of total. Those figures describe the most the GPU may use, not memory that's permanently locked away from your apps. Some ASUS boards add a fixed iGPU shared-memory size of 64M when multi-monitor is enabled, according to a forum post quoting the BIOS help text.
Who benefits most
| Use case | Does the iGPU help? |
|---|---|
| Extra monitors beyond your card's ports | Yes, if the board has outputs and the CPU has graphics |
| Backup display / diagnostics | Often, with the caveats above |
| Offloading encoding in supported apps | Yes, depending on app, codec and drivers |
| Gaming alongside a strong discrete GPU | No. Use the discrete card |
| Light gaming without a dedicated card | Depends heavily on the chip; APUs like the 8700G do better |
Bottom line
Enabling your iGPU costs a trip to the BIOS and a possible driver check. In return you get extra display outputs, an independent media engine and a plan B when your graphics card fails. It won't make a budget chip beat an RTX card.
Confirm that your CPU has graphics. Then read your motherboard manual for the exact setting name, and test one secondary monitor before you rely on it. If you're building a new PC, picking a CPU with an iGPU is cheap insurance.