How to Fix GPU Artifacts and Graphical Glitches

GPU artifacts most often appear because the graphics card is overheating, running an unstable overclock, or using a faulty driver. Artifacts are visual defects the card itself produces: scattered colored dots, stray geometric shapes, flickering textures, or torn blocks of pixels that appear across every application rather than inside a single game. The fault sits in the graphics hardware, its power, or its driver rather than in the software being displayed.

This article lists the causes of GPU artifacts in order of probability, then walks through step-by-step solutions ordered from the easiest reset to the deeper hardware tests. The fixes cover resetting any overclock, clean-installing the driver with DDU, checking and cooling the GPU, reseating the card and its PCIe power, swapping the cable and port, stress-testing with FurMark and memtest_vulkan, underclocking to confirm a VRAM fault, and testing the card in another system. Each solution states what it resolves and gives the exact procedure to follow.

What Causes GPU Artifacts?

GPU artifacts occur because the graphics card produces incorrect pixel data, most commonly from overheating, an unstable overclock, or a faulty driver. The corruption originates in the card’s processor, memory, or output rather than in the operating system, and the causes rank by how often they occur. The common causes are listed below, most frequent first:

• GPU overheating pushes the core or memory past its stable temperature, so the chip miscalculates pixels and renders visible defects.
• An unstable overclock on the core or memory exceeds what the silicon can compute correctly, producing artifacts under load.
• A faulty or outdated driver feeds the card incorrect instructions, generating corruption that a clean driver install removes.
• Failing VRAM stores pixel and texture data incorrectly, so corrupted memory cells show as flickering or misplaced textures.
• Insufficient power from a weak or failing supply starves the card under load, causing it to compute or output incorrectly.
• A damaged cable or port corrupts the signal between the card and the monitor, adding artifacts that move with the cable.
• A dying GPU with degraded solder joints or a failing core produces worsening artifacts that no driver or setting resolves.

The distinction that matters is that true artifacts appear across the whole system, not only inside one game, which separates a hardware or driver fault from an in-game rendering bug. Artifacts that worsen as the card heats up point toward the overheating diagnosis, while corruption that travels with the video cable points to the cable or port rather than the card.

Reset Any GPU Overclock to Stock Speeds

Resetting any overclock to stock speeds resolves artifacts caused by core or memory clocks pushed beyond what the silicon computes correctly. An overclock that passed a short test can still produce artifacts under a heavier or longer load, and returning the card to its rated speeds removes that variable first. Follow these steps:

1. Open the overclocking tool such as MSI Afterburner and click reset to return the core clock, memory clock, and voltage to their default values.
2. Disable any automatic overclock profile set to load at startup, since a saved profile reapplies the unstable clocks after every reboot.
3. Test the card at stock speeds under the same load that produced the artifacts to confirm whether the overclock caused them.
4. Reapply a smaller overclock only after stock speeds run clean, lowering the memory clock first because failing VRAM artifacts most.

A card that renders cleanly at stock speeds but artifacts when overclocked has an unstable overclock, not a hardware fault. Memory overclocks produce artifacts more readily than core overclocks, so the memory clock is the first to lower when tuning a card that has shown corruption.

Clean-Install the Graphics Driver With DDU

Clean-installing the driver with DDU resolves artifacts caused by a corrupted, faulty, or partially installed graphics driver. A driver damaged by a failed update or a leftover from a previous version feeds the card incorrect instructions, and Display Driver Uninstaller removes every trace before a fresh install. Follow these steps:

1. Download the latest driver and DDU before starting, since the network adapter may lose its driver during the removal.
2. Boot into Safe Mode and run DDU, choosing clean and restart so the tool strips every driver file, registry entry, and cached profile.
3. Install the freshly downloaded driver after the reboot, selecting a clean installation rather than an upgrade over the old files.
4. Roll back to an earlier driver if the artifacts began immediately after a recent update, because a specific release can be faulty.

A system whose artifacts disappear after a clean driver install had a corrupted or faulty driver rather than failing hardware. A new driver that introduces artifacts where the previous one ran clean is itself the fault, so rolling back to the last stable release confirms the driver as the cause. Artifacts that persist across every driver version point back toward the thermal and hardware checks.

Check GPU Temperatures and Clean the Card

Checking the GPU temperature and cleaning the card resolves artifacts caused by a core or memory that overheats under load. A graphics card that exceeds its stable temperature miscalculates pixels, and dust on its heatsink or dried paste on its core raises the temperature until artifacts appear. Follow these steps:

1. Read the GPU core and memory junction temperatures in HWiNFO under load, since artifacts that appear above a threshold confirm a thermal cause.
2. Blow dust from the card’s heatsink fins and fans with compressed air, holding the fans still so they do not spin and generate current.
3. Confirm the card’s fans spin up under load, because a card in zero-RPM idle mode that fails to start its fans overheats quickly.
4. Repaste the GPU core and replace the thermal pads on an older card whose temperatures stay high after the fins are clean.

A card that artifacts only after its temperature crosses a threshold is overheating, so the cleaning and repaste restore its stable operation. The full diagnosis of which part of a system runs hot appears in the overheating diagnosis guide, and the airflow that keeps a graphics card cool is detailed in the GPU cooling explanation.

Reseat the Graphics Card and PCIe Power

Reseating the card and its PCIe power resolves artifacts caused by a poor slot connection or unstable power delivery. A card that lost full contact in its slot, or one whose PCIe power cable is loose or under-supplied, computes and outputs incorrectly under load. Follow these steps:

1. Power off and unplug the system, then release the PCIe slot latch and the rear bracket screw and remove the card.
2. Reseat the card firmly in the top x16 slot until the latch clicks, because a card seated on one edge makes intermittent contact.
3. Reconnect each PCIe power cable using separate cables rather than a single daisy-chained lead on a high-draw card, since shared cables can sag under load.
4. Confirm the power supply has the capacity the card requires, as a supply near its limit drops voltage and triggers artifacts under load.

A card that artifacts under load but renders cleanly at the desktop may be starved of power by a weak supply or a daisy-chained cable. A power supply too small for the card produces instability that imitates a failing GPU, so the supply capacity is confirmed before the card is judged faulty. A card whose fans spin but outputs nothing at all is a separate fault in the no-display guide.

Test Another Cable, Port, and Monitor

Testing another cable, port, and monitor resolves artifacts caused by a damaged video cable or a failing output port rather than the card itself. A frayed cable or a damaged DisplayPort or HDMI connector corrupts the signal between the card and the screen, adding artifacts that the card never generated. Follow these steps:

1. Swap the video cable for a known-good one, since a damaged cable corrupts the signal and is an inexpensive first test.
2. Move the cable to a different output on the card, because one failed DisplayPort or HDMI port can artifact while the others work.
3. Connect a different monitor to rule out a fault in the display panel rather than the card or cable.
4. Wiggle the cable gently during the test, as corruption that flickers with movement confirms a damaged cable or a loose connector.

Artifacts that change or vanish when the cable, port, or monitor is swapped came from the signal path, not the card. Corruption that appears identically in the firmware screen before Windows loads, however, originates in the card hardware and cannot be a driver or an application bug, narrowing the fault to the GPU itself.

Stress-Test the GPU With FurMark and a Memory Test

Stress-testing with FurMark and a VRAM test confirms whether the artifacts come from the core under load or from failing memory. A controlled load reproduces the artifacts reliably, and a dedicated memory test reads and writes every VRAM cell to find errors. Follow these steps:

1. Run FurMark for ten to fifteen minutes, watching for artifacts and recording the temperature at which they appear.
2. Run a VRAM test such as memtest_vulkan, which writes patterns across the graphics memory and reports any cells that read back incorrectly.
3. Compare the results at stock and reduced clocks, since errors that disappear when the memory clock is lowered point to marginal VRAM.
4. Note whether artifacts track temperature or appear immediately, because heat-linked artifacts point to cooling and instant ones point to the silicon.

Artifacts that FurMark reproduces only above a temperature threshold confirm a cooling fault, while memory errors that memtest_vulkan reports confirm failing VRAM. A card that fails the memory test at stock speeds has degraded memory hardware, separating it from the unstable overclock and thermal causes already ruled out.

Underclock to Confirm a VRAM or Core Fault

Underclocking the card confirms whether marginal VRAM or a weakening core is producing the artifacts. Lowering the memory or core clock below stock reduces the demand on the silicon, and artifacts that vanish at reduced speeds reveal hardware that can no longer hold its rated clocks. Follow these steps:

1. Lower the memory clock by a few hundred megahertz in the overclocking tool, since failing VRAM stabilizes when its clock drops below the fault threshold.
2. Test under the same load that produced the artifacts to see whether the lower memory clock clears them.
3. Lower the core clock and voltage next if the memory underclock alone does not help, isolating a weakening core.
4. Run the card at the stable reduced clocks as a temporary measure, recognizing that a card needing an underclock to render cleanly is degrading.

A card that renders cleanly only after the memory clock is dropped below stock has marginal VRAM that can no longer sustain its rated speed. An underclock keeps a degrading card usable for a time, but worsening artifacts that need ever-lower clocks confirm a dying GPU heading toward replacement, a fault distinct from the recoverable causes above.

Test the Graphics Card in Another System

Testing the card in another system isolates the artifacts to the graphics card itself rather than the motherboard, power supply, or drivers. Installing the suspect card in a known-good system determines whether the fault travels with the card. Follow these steps:

1. Install the card in a second computer with a power supply and slot known to work, then clean-install the driver.
2. Run the same load test that produced the artifacts to see whether they follow the card to the new system.
3. Test a known-good card in the original system as the reverse check, confirming whether the slot, supply, or board is at fault.
4. Judge the result: artifacts that follow the card confirm a dying GPU, while a clean card in the original system points to the host hardware.

A card that artifacts in every system has failing hardware and needs replacement, while one that renders cleanly elsewhere points the fault back to the original system’s power supply, slot, or cooling. A graphics card that also overheats in the original system but runs cool in another ties back to the overheating diagnosis for that system’s airflow.

Key Takeaways

• Reset any overclock to stock speeds first, since an unstable memory or core clock is a common and quickly ruled-out cause.
• Clean-install the driver with DDU to remove a corrupted or faulty driver feeding the card bad instructions.
• Check GPU temperatures and clean the card, because a card that artifacts above a threshold is overheating.
• Reseat the card and PCIe power, and confirm the supply has the capacity the card draws under load.
• Stress-test with FurMark and memtest_vulkan to separate a thermal fault from failing VRAM.
• Underclock and test in another system to confirm a dying GPU when artifacts persist across drivers and cables.

Last Thoughts on GPU Artifacts

GPU artifacts come from the card’s hardware, power, or driver, so the fix moves from the easiest reset to the deepest hardware test: reset any overclock, clean-install the driver with DDU, check temperatures and clean the card, reseat the card and PCIe power, swap the cable and port, stress-test with FurMark and a VRAM test, underclock to confirm a memory fault, and test the card in another system. The symptom table separates a thermal cause from failing VRAM. Readers can continue with the diagnosis of an overheating PC, the explanation of GPU cooling, or the hub of common PC problems for related hardware faults.