MemtestG80

MemtestG80 provides you with a tool that can be used to diagnose memory-related issues for NVIDIA CUDA-enabled graphical processing units.

Console-based memory checker

The application only works in the command prompt, so it might seem difficult to work with for those who are not familiar with the console and the way it is used. Even so, its options are clear ans the syntax shouldn't pose any problems to more experienced users.
What this application actually does is verify whether the GPU memory is working as it should or not. Also, it checks the operation mode and the order in which instructions are executed. It can help you make sure that the GPU of your computer does not trigger errors that might result in failing to load graphics or perform a specific operation.

Various test methods and configurations

MemtestG80 relies on various test methods, many of them borrowed from the popular Memtest86. There are a few parameters that you can alter, although the default configuration should work on most machines.
You can instruct the application to run tests on the Nth CUDA GPU and optionally specify the RAM clock speed. The core clock speed is also customizable.
As mentioned above, MemtestG80 is especially dedicated to CUDA hardware components, which means its compatibility range is limited to this GPU type and it won't work unless a CUDA GPU is detected in your system configuration.

Makes sure that your GPU is running as it should

MemtestG80 can prove useful for assessing the capabilities of an NVIDIA GPU and ensuring that it operates correctly. However, a more user-friendly GUI would make it more appealing, attracting more users.