Now that we discovered this regularity, we thought it would make a lot of sense to find out what is the most optimal voltage setting, i.e. at what voltage will the working frequencies of these Kingston modules be maximal? Therefore, we tested Kingston HyperX KHX7200D2K2/1G at different voltages but with the same 5-5-5-15 timings. Every time we tried to get the maximum working frequency, when the memory modules could operate stably and reliably. Here are the obtained results:
2.2V appeared the critical voltage for Kingston HyperX KHX7200D2K2/1G: this is when these memory modules work at the top of their power. Further voltage increase causes very severe performance issues, as we may see from the diagram above.
At 2.2V our today’s hero managed to reach 976MHz. It is very close to what Micron based memory modules for overclockers could do at the same voltage. But nevertheless, Kingston HyperX KHX7200D2K2/1G gets defeated by the competitors based on Micron chips. This statement would be best illustrated by the diagram where the Kingston performance results are compared against the competitors we have already tested earlier (all memory modules were tested at their nominal voltage, as set by the manufacturer).
Here Kingston HyperX KHX7200D2K2/1G is definitely losing. Unfortunately, Infineon chips didn’t prove up to our bravest expectations and failed to compete with Micron chips even at the least aggressive timing settings. However, if you are looking to set high working frequencies for your memory in the first place, then Kinston HyperX solution will not be yielding to the competitors that much any more.
In conclusion I would like to say that if you would like to read more on the influence timing settings and memory working frequency can have on the overall system performance, you should check out our article called DDR2 SDRAM for Overclocking Fans: Getting Beyond 1GHz .