I tried comparing your newegg listing with the mfg site and found this:
http://www.gskill.com/products.php?index=502&c1=1&c2=3
if this is the same, the full spec is listed as:
Designed For 2nd Generation Intel® Core™ Processors
Specifications
Model Number F3-2133C9D-16GXH
Series RipjawsX
System DESKTOP
System Type DDR3
Main Board INTEL
M/B Chipset P67 / Z68
Capacity 16GB (8GBx2)
Multi-Channel Kit Dual Channel kit
Tested Speed DDR3-2133 MHz (PC3-17000)
Tested Latency 9-11-11 2N
Tested Voltage 1.6V
Registered/Unbuffered Unbuffered
Error Checking Non-ECC
Type 240-pin DIMM
SPD Speed 1333 MHz
SPD Voltage 1.5V
Warranty Lifetime
Fan lncluded No
Features Intel XMP (Extreme Momery Profile)Ready
Qualified Motherboards List
ASUS P8Z68 DELUXE
ASUS P8Z68-V PRO
ASUS P8Z68-V
ASUS Maximus IV Extreme
ASUS SABERTOOTH P67
ASUS P8P67 DELUXE
ASUS P8P67 EVO
ASUS P8P67 PRO
Gigabyte GA-Z68X-UD7-B3
Gigabyte GA-Z68X-UD5-B3
Gigabyte GA-P67A-UD7
Gigabyte GA-P67A-UD5
MSI P67A-GD65 (Bios Ver 1.B)
MSI P67A-GD55 (Bios Ver 1.B)
MSI P67A-GD53 (Bios Ver 1.B)
ASRock Fatal1ty Z68 Professional
ASRock Z68 Extreme4
ASRock Fatal1ty P67 Professional
ASRock P67 Extreme 6
ASRock P67 Extreme 4
*G.Skill guarantees 2 Dimms dual channel operation would reach announced specification.
These specs seem confusing this the ref to both 2133 and the SPD 1333. But I am just getting into this so I am listening too.
How this helps.