RX 7800 XT Not Recognized by Windows: Troubleshooting

Quick Answer

If Windows isn't recognising your RX 7800 XT, the fix is usually a clean driver reinstall via DDU, a fresh PCIe slot reseat, or a BIOS update enabling Resizable BAR. Power cable issues come third, faulty cards last.

Why Windows Isn't Detecting Your RX 7800 XT

Device Manager showing nothing or a yellow triangle on your 7800 XT means the GPU isn't completing handshake with the chipset. The usual culprits are stale Nvidia leftovers from a previous card, a half-seated PCIe x16 connector, or a motherboard that needs Resizable BAR enabled in BIOS. Less often it's a dead 16-pin or 8+8-pin power cable, or a PSU that can't push the 263W board power cleanly. SA's voltage swings during loadshedding rotations can also confuse PCIe negotiation if you booted right after power was restored.

Step-by-Step Troubleshooting

Power down, unplug the PC, and reseat the card firmly until you hear the latch click. Check both PCIe power cables are fully seated, no daisy chains. Boot into Safe Mode and run Display Driver Uninstaller (DDU) to wipe every Radeon and GeForce trace, then install the latest AMD Adrenalin straight from amd.com. If the card still shows as Microsoft Basic Display, jump into BIOS and toggle Above 4G Decoding and Re-Size BAR to Enabled. Update your motherboard BIOS to the newest stable release while you're there. Disable any onboard graphics in BIOS so the system commits to the discrete GPU as primary.

When the Card Itself Is the Problem

If you've done the lot and Windows still won't see it, swap to a different PCIe slot, try a known-good monitor cable, and test the card in another rig if possible. SA's voltage swings during loadshedding can fry GPUs, so a decent line-interactive UPS is a smart insurance policy. All RX 7800 XT cards from Evetech ship with full SA warranty and local RMA, so you're not posting hardware to Hong Kong if something's genuinely faulty. Quote the order number to support and a courier collection from anywhere in SA gets arranged fast.

Frequently Asked Questions

Why does my 7800 XT show as Microsoft Basic Display Adapter?

Windows defaults to that name when the AMD driver fails to bind. Reinstall Adrenalin after a DDU sweep and it'll resolve to Radeon RX 7800 XT.

Do I need Resizable BAR for the 7800 XT to be detected?

Re-Size BAR isn't required for detection, but Above 4G Decoding sometimes is on older AM4 boards. Toggle both on if your card is silent.

Can a weak PSU stop the 7800 XT from being recognised?

Yes. Anything below a quality 650W 80+ Gold can cause the card to fail to initialise during POST. AMD recommends 700W minimum.