Articles: Memory

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When we selected the minimum timings (2-5-2-2-1T), the memory was stable up to DDR450. This is somewhat worse than Winbond’s classic BH-5 chips can do (DDR466 and higher under the same conditions). But those famous BH-5 (long out of production and unavailable today) couldn’t even dream of the configuration flexibility that Samsung’s TCCD chips offer.

Having such an outstanding memory kit on our hands, we couldn’t help try it at extreme overclocking. We performed a simple volt modification to increase the DIMM voltage to 3.3V.

As you can see, the G.Skill kit behaves much like BH-5 chips that usually overclock to 240-250MHz at the lowest timings and at 3.3V. The most interesting results, however, are about 2.5-8-3-3-1T timings. The mainboard we use is known to dislike 1T at memory frequencies above 275MHz. But the G.Skill F1-4800DSU2-1GBFR kit seems to make an exception: the modules were stable at DDR610 frequency with 1T Command Rate. Besides that, we could lift the memory frequency up by 5MHz more, to 310 (DDR620) MHz, by choosing 2.5-8-4-4 timings (with Command Rate = 1T). As for overclocking with Command Rate = 2T, the results are clearly limited by the potential of our sample of the ASUS A8N-SLI Premium mainboard: the memory couldn’t pass our tests at DDR666.

Having played enough with this exceptional memory, we then took DDR566 modules from the G.Skill F1-4400DSU2-1GBFC kit into our hands. These modules were absolutely stable in their rated mode, i.e. as DDR566 with 2.5-8-4-4-2T timings and 2.7V voltage.

Next we increased the voltage to 3.0V (we didn’t check this kit with volt-modding) and found the following frequencies to be the maximum stable ones:

This is smaller than with G.Skill’s F1-4800DSU2-1GBFR and, unlike with the top product, is quite typical for chips from Samsung. On the other hand, the kits differ rather much in price, making the G.Skill F1-4400DSU2-1GBFC kit a much more affordable product.

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