Hard disk drive diagnostic utility ~ a tool to check your hard drive for any manufactured defect. It is useful for home user to check their hard drive before sending to manufacturer for a new good replaced hard drive. Every hard drive manufacturer has their own diagnostic utility to check faulty hard drive. And here is the one for Samsung Hard Disk Drive ~ ES-Tool.
GPU-Z ~ a free utility designed to give you all information about your video card and GPU. It provides displays adapter, GPU and display information. It also provides displays overclock, default clocks and 3D clocks. I use it to trace my ATI HD 4870 GPU temp and fan speed. It has log to file function. Therefore, you can trace these during game play.