Just because the memory chips on the memory module you received are the exact same kind as the ones on the Mushkin High Perf. REV 3 modules, it does not mean that the memory module you received will perform equally well as the Mushkin High Perf REV 3 modules. There are two parts that go into the equation of determining a quality DIMM: the DRAM chips themselves and the PCB (Printed Circuit Board). Both parts of this equation carry an equal weight, meaning that if you have some very high performing and ultra reliable SDRAM chips on a poorly manufactured PCB, the memory chips won't live up to there true potential.
What goes into a quality PCB:
* Minimum and maximum trace lengths for all signals on the module
* Precise specifications for trace width and spacing
* 6 layer PCB's with unbroken power and ground planes
* Detailed specifications for the distances between each circuit board layer
* Precisely matched clock trace lengths, as well as routing, loading, and termination requirements
* Series termination resistors on the data lines
* EEPROM programming must follow detailed specifications
* ElectroMagnetic Interference Suppression
As you can see there is a potential for a lot of differences between PCB's, so even if you do have the same chip you've only won half the battle.
Another difference between your module and our High Perf. REV 3 module is the fact that the Siemens Infineon memory chips on our High Perf. REV 3 modules are hand picked for there overclockability.