GPU – How to Test GPU Memory/RAM

Visual artifacts can be caused by an overheating graphics card. Check your graphics card temperature with a tool like GPU-Z. If the GPU is overheating, make sure the GPU fan is hooked up to its power connector. You might have to remove the heatsink and re-attach it after applying a thin layer of thermal paste. Depending on airflow within your case you might need to redirect some air toward the graphics card.

Damaged GPU RAM can cause artifacts. When handling the graphics card, or any computer component, make sure you practice anti-static procedures. Ground yourself before touching any card to drain any static electricity that may have built up when you walked across the carpet or pet the kitty, and keep yourself grounded while handling the card. Try to hold the card by its edges and avoid touching any chips or metal parts of the card. Although it's possible to successfully install a card in the computer without being grounded, all it takes is one little zap and you've fried the GPU RAM or something else inside the case.

Make sure you have the power connectors hooked up correctly to the graphics card. Some cards require one or two power connections.

There is no way to do that normally. There may be some hacks specific to your video card, like editing the registry, however its not recommended. The RAM memory is only used if the graphics cards GDDR becomes too full.

Its not likely that your problem comes from the shared memory.