You can buy 3DMark for just $4.99, a sweet 80% saving over its regular price of $24.99.

Save 80% on 3DMark
http://store.steampowered.com/app/223850/

Recommended by 94% of Steam user reviews, 3DMark Advanced Edition includes eight individual benchmarks covering the full range of Windows PC hardware. It improves on the free version by adding the ability to:

  • Run Fire Strike Ultra, the world's first and only 4K Ultra HD benchmark.
  • Use Fire Strike Extreme to test PCs with multiple GPUs (CrossFire/SLI).
  • Use benchmark looping to test your overclocking for stability.
  • See in-depth performance graphs of your benchmark runs.
  • Automatically save your results offline.
  • Earn Steam Achievements(!), and compete for the fastest PC on Steam leaderboards.
  • Move your key freely between the Steam and standalone versions.