How to Test NVIDIA/AMD Performance with OCCT
1. Download OCCT from this link:
OCCT 3.1.0
Information
- Version 3.1.0 should be used as the latest versions of OCCT don't provide the same functionality.
- GPU: MEMTEST will not work on AMD cards & will only work with an Nvidia Card that supports CUDA
Make sure you have the latest DirectX 9.0 Runtimes
Download: DirectX End-User Runtime - Microsoft Download Center - Download Details 2. Run the setup, and install the program
The program contains four different tests as shown below
Test 1: GPU Stress Test In the GPU: OCCT section select your desired options such as your Test type, Test Duration, Shader complexity 1 Hour is usually recommended for the test
Click ON to start the Stress test
Enabling the Error Check will allow the program to log any errors found in the test
Test 2: Video Memory Test
OCCT GPU Memtest, based on Nvidia CUDA runs a Memtest-like test on your GPU Memory. It is aimed at detecting manufacturing errors on the GPU memory
In the GPU: MEMTEST section select the number of Passes, usually 5-7 will be sufficient for detecting errors
Click ON to start the Stress test
At the end of each test a folder containing graph will be created in C:\Users\[user Name\Documents\OCCT\[Date] as shown below:
If any errors are found they will be reported on the graphs
Here is an example of a possible defect in GPU Memory:
Warning
Monitor your GPU temperatures. If you see artifacts, or the temperature of your GPU exceeds 80C, stop the test.
NVIDIA/AMD Video Card - Test with OCCT 
Quote: Originally Posted by hecham 
How can I test video card ram? 
