Intel i7 4770K w/ factory cooler
2 x 8GB Kingston HyperX Predator DDR3-2133
240GB Kingston HyperX 3K SSD
LG Hitachi 8X Blu-Ray Burner
SilverStone Temjin TJ04-E Evolution
SilverStone Strider Gold 650W
Windows 8 Professional
As I mentioned, upon initial bootup the memory is identified as DDR3-1333 with relaxed 9-9-9 timings. The reason for this is to ensure full compatibility at default settings. Using CPU-Z to inspect the SPD profiles we find two XMP settings, one at the advertised DDR3-2133 11-12-11 and a second at DDR3-1600 9-9-9. Undoubtedly some older systems are not capable of achieving the full 1066MHz speed and would need to use the second XMP profile, which is still not too shabby given the high capacity 8GB modules. Selecting the first XMP profile in our test system BIOS correctly set all timing values except for the Command Rate, which was auto-detecting as 2T. Manually changing this to a 1T CMD to match the XMP profile seemed to straighten everything out, and allowed us to proceed with testing.
In order to put benchmarks into perspective, it helps to have something to compare to. Since DDR3-1866 9-9-9 is a fairly common memory type and speed, we're going to throw some results from those into the mix to see if a slightly lower frequency with better timings helps.
As might be expected, AIDA64 shows a clear advantage to the DDR3-2133 kit in overall speed and bandwidth, while sacrificing a nanosecond or two in latency. SiSoft Sandra confirms these findings, with measured latency only a few tenths of a nanosecond apart. By all appearances, taking the jump from DDR3-1866 to 2133 is enough of a speed increase to offset the higher timings.
Curious to see if the HyperX DDR3-2133 modules could go any higher, I bumped the voltage to 1.65v and picked the next frequency step on the list, DDR3-2200. This booted and ran fine, and timings were automatically increased to compensate. Performance improved a marginal amount, roughly 3% over the 2133 scores. I also tried DDR3-2400 but that resulted in a no-POST.
Let's wrap things up with some final thoughts and conclusion.