Articles: Memory

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A Mirage of DDR700 SDRAM?

So, we couldn’t get the promised 700MHz from our sample of Patriot PDC1G5600ELK memory. The manufacturer seems to have been carried away with proud marketing announcements, but didn’t support them with careful selection of memory chips. And still, the release of memory modules marked as DDR700 SDRAM, even though they proved to be not the best memory possible, put a thought into our heads.

The Patriot PDC1G5600ELK series is not just a pure hoax. Even though we were not lucky with our off-the-shelf sample, the PDP Systems engineers certainly had some PC5600-capable modules in their own tests. It means that some Samsung TCCD chips can overcome the 700MHz barrier. At least in theory. But in practice no one is going to set 3-5-5-10 timings and 2T Command Rate just for the pleasure to reach sky-high operational frequencies. We’ve never carried out such experiments in our labs. Maybe we should try?

Ok. Not so long ago we tested OCZ EL DDR PC-4800 Dual Channel Platinum memory modules and were left highly satisfied with them (for edtails see our articloe called DDR600 SDRAM Tested: OCZ EL DDR PC-4800 Dual Channel Platinum Review ). Particularly, this memory was stable as DDR640 SDRAM at 2.9V voltage, 3-4-4-10 timings and 1T Command Rate. It was logical to suppose that these modules would be stable at 700MHz frequency if the timings were slackened and the Command Rate set at 2T. Our expectations came true: the OCZ EL DDR PC-4800 Dual Channel Platinum memory was absolutely stable as PC5600 SDRAM at the standard settings of the Patriot PDC1G5600ELK.

It means that although PDP Systems was the first company to announce DDR700 SDRAM officially, memory modules capable of working at this frequency had already been available before. In fact, many high-quality memory modules on Samsung TCCD chips can work at 700MHz if you lift the timings up. Unfortunately, the Patriot PDC1G5600ELK modules do not belong here as concerns stable operation as DDR700 SDRAM.

But should we be sad at all about a memory kit not working at a high frequency with poor timings? Our performance tests will show now…

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