I have to agree with Nano. These results are similar to the performance gains you might see using an APU
. IMO, these numbers seem high for a dGPU rig.
As a sidenote, the performance gains you get at each step between 1600MHz and 2400MHz aren't linear. 1866MHz - 2133MHz is where performance starts leveling off. Watch for price vs. performance also.
Main: i5-3570K, ASRock Z77 Pro4-M, Asus GTX660 TOP, 500GB Crucial BX100, 2 TB Samsung EcoGreen F4, 16GB 1600MHz G.Skill @1.25V, Silverstone PS07B
HTPC: A8-5600K, MSI FM2-A75IA-E53, 4TB Seagate SSHD, 8GB 1866MHz G.Skill, Hand-Built Wood Case