Since Rainbow Six: Siege not detecting graphics card usually indicates a lack of permission, you should run the game as an administrator.  In the case that the issue persists, you may want to change the main graphics card, disable the integrated graphics card, update the graphics card driver and so on. You don’t know how to carry out the solutions your own? Then it’s strongly recommended that you spare a bit of time to check out this article. 

Rainbow Six: Siege Won’t Detect Graphics Card: Possibilities

Permission 

As a precaution, Windows only permits programs to access certain parts of the computers from the get-go. Depending on the situation, Windows users could grant programs more permissions.  Hence, once it comes to Rainbow Six: Siege not detecting graphics card, you must take permission into account. On the bright side, if permission is the one responsible, there is no need to do much. 

Integrated Graphics Card

For your information, quite a few modern computers have integrated graphics cards. Unless specified otherwise, computers will default to their integrated graphics card in the course of operation which leads to errors while running high-end games.

Graphics Card Driver 

To put it plainly, computers cannot manage graphics cards directly and have to rely on graphics card drivers as intermediaries. You have a hard time getting Rainbow Six: Siege to detect the graphics card of your PC? Then it’s highly likely that the graphics card driver is out-of-date.

Addressing The Issue

Run As An Administrator

If you have been launching your Rainbow Six: Siege game via the shortcut or the game launcher, PC processes may restrict some parts of your game. To fix this, follow the steps below:

• Step 1: Go to Rainbow Six: Siege game folder.
• Step 2: Locate Rainbow Six: Siege executable file (.exe), right-click it and pick Properties.
• Step 3: Go to Compatibility tab then check the checkbox next to Run this program as an administrator. 
• Step 4: Select Apply then choose OK.
• Step 5: Launch the game. 

Change Graphics Card Card

• Step 1: Go to Search bar, type NVIDIA Control Panel and press Enter
• Step 2: Navigate to Manage 3D settings and hit the Global Settings tab.
• Step 3: Go to the Preferred graphics processor section and set High-performance NVIDIA processor as your main GPU.
• Step 4: Select the Program Settings tab and choose Add.
• Step 5: Locate Rainbow Six: Siege from the list of options and click it.
• Step 6: Set High-performance NVIDIA processor under Preferred graphics processor, pick  Apply to save the changes and relaunch the game.

Disable Integrated Graphics Card

• Step 1: Go to Search bar, type devmgmt.msc then press Enter to open Device Manager. 
• Step 2: Expand Display Adapters, right-click the integrated graphics card and pick Disable device.
• Step 3: Restart your computer.

Update Graphics Card Driver

• Step 1: Go to Search bar, type NVIDIA Control Panel and press Enter
• Step 2: Select System Information and choose the Display tab.
• Step 3: Locate your GPU’s name and Driver Version.
• Step 4: Launch your web browser, go to Official Drivers | NVIDIA and search for the latest driver version of your graphics card. 
• Step 5: Go to Downloads folder, find the driver update and run it as an administrator. Follow the onscreen instructions to perform the driver update. Last but not least, restart your computer. 

Alternatively,

• Step 1: Go to Search bar, type devmgmt.msc then press Enter to open Device Manager. 
• Step 2: Expand Display Adapters, right-click the “gaming” graphics card and pick Update driver.
• Step 3: Hit Search automatically for the update driver software then allow the process to run from start to finish. 
• Step 4: Restart your computer.
• Step 5: When the screen comes back on, launch Rainbow Six: Siege.

Lessons For New Players

Take advantage of audio cues

All actions in Rainbow Six: Siege makes some sort of sound, no matter how little. By paying attention, you could hear enemies before actually seeing them which gives you a chance to attack first. 

Don’t move at whim

You can hear the enemies and they can hear you as well. That means you should only move when you have to to keep the noise down to the minimum.