If you're picking out a CPU or graphics card for a custom-built personal computer, ignore basically every number the manufacturer provides to quantify its performance, and go look at some benchmarks. Not because the numbers the manufacturers provide are inaccurate, but because there are so many factors that go into how good hardware is besides the those numbers, that you will never get as accurate an estimate from them as with direct measurement of the performance.

Also, make sure they are compatible with your motherboard.