Memtest86 is a quick test, taking roughly 1 hour per 8GB of memory. However, this is dependent on the memory configuration. For example, a single stick of 16GB may take 2.5 hours or longer, compared to two 8GB modules taking 2 hours to test. If you have multiple kits, make sure you test each kit individually, even if they have the same part number.. "/>How to test ram stability