Articles: Memory

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If we combine this info with the data we managed to get on the manufacturer’s web-site we will get a full formal specification of this product. Although, I have to admit that there were a few contradictions here: the package sticker features CAS# Latency 4, while the manufacturer’s web-site suggested it is CAS# Latency 5.

The second value is most likely to be the correct one. Here is the formal technical specification of the Kingston HyperX KHX7200D2K2/1G DDR2 memory kit:

  • Frequency: 900MHz DDR;
  • Nominal timings: 5-5-5-15;
  • Organization: 64M x 8 DDR2;
  • Nominal voltage: 2.0V;
  • The kit contains two 240-pin unbuffered DDR2 SDRAM modules, 512MB each, without ECC support;
  • Memory modules are equipped with blue aluminum heatsinks;
  • Memory modules are provided with life warranty.

I would like to stress right away that the specifications we have just seen are somewhat different from what we could see by overclocker’s memory solutions offered by Kingston’s competitors. Most products of the kind support 1000MHz nominal frequency (PC2-8000), while Kingston set the nominal frequency of its modules to 900MHz (PC2-7200). And it is with even less aggressive timings of 5-5-5-15! Maybe it can be explained by the fact that the nominal voltage all Kingston HyperX KHX7200D2K2/1G memory modules are tested with during the production process is set to 2.0V. As you know many other manufacturers have no problem setting the nominal voltage to 2.1V and even 2.2V. However, I honestly don’t think that Kingston reduced the speed parameters on purpose, especially today when the competition in the memory market has become really aggressive. I believe that we should look deeper at the roots of things if we want to find out why the specification of these memory modules is so much different from the specs of alternative solutions from other memory makers.

And where are these roots in our case? Well, they are right under the heat-spreader. Here I would like to specifically stress that the sticky conductive take Kingston uses to fasten the heat-spreaders to the chips is of excellent quality. As we will see during the test session its conductive features are truly great, but besides that it holds the heat-spreader in place with perfect security. It turned out a tricky task to remove the heat-spreaders from the Kingston HyperX KHX7200D2K2/1G memory modules. However, our curiosity was overwhelming, so finally our efforts were rewarded :) When we removed the heat-spreaders we discovered that the DDR2 SDRAM Kingston HyperX KHX7200D2K2/1G memory modules are based on Infineon chips. Their full marking is HYB18T512800AF3S.

This turned out a sensational discovery for us: it was the first time we saw these chips in an overclocker product. Moreover, all other memory manufacturers of well-overclockable DDR2 SDRAM solutions have always used Micron D9DQT chips in their modules. Does it mean that Kingston engineers managed to find a worthy alternative to the good old Micron chips?

According to the specification, Infineon HYB18T512800AF3S are intended to support CAS# Latency 5 at 667MHz frequency. However, it doesn’t really mean anything yet. The official specifications of the Micron D9DQT chips are exactly the same.

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