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Extreme Performance PDC5123200+XBLK

Well, now we have finally reached the most interesting testing participants of our today’s session. The memory marked as XBL is a universal solution, combining the ability of the Erased Latency modules to work at high frequencies with that of Low Latency modules to support minimal timings.

The sticker doesn’t offer us much info.

While the specifications on the site reveal all possible combinations of working frequencies and memory timings.

  • 400MHz – PC3200 2.0-2-2-5
  • 436MHz – PC3500 2.0-3-3-6
  • 466MHz – PC3700 2.0-3-3-6
  • 500MHz – PC4000 2.5-3-3-7
  • 533MHz – PC4200 3.0-4-4-8

I have never seen any memory like that before, and haven’t even heard that there are modules supporting these features.

The info read from the SPD is quite scarce:

However, this is the only pair of modules of all the solutions tested today that managed to start on ASUS P4C800 mainboard with the default timing settings at 200MHz frequency. All other modules started only with 2.5-3-3-6 timings no matter what the SPD said.

The first benchmark results almost struck me dumb: the memory started at 300MHz frequency, just as if it were DDR600! Although we failed to get it work stably at this frequency even when we installed additional cooling and raised the voltage to 2.85V. The final performance results are given below:

285MHz is a phenomenal overclocking achievement. It would correspond to DDR570 or PC4560, if it ever existed. Unbelievable result! Here is the memory performance in SiSoftware Sandra 2004 SP2. Please make sure you check out the list of competing solutions first:

Well, what can we say here? In fact, only one thing: Good bye, our good old Kingston HyperX 2x256MB memory modules. You have done a great job providing excellent performance with the minimal possible timings of 2.0-2-2-5 at 200MHYz working frequency. But you belong to the Low Latency family and didn’t overclock that well. 220MHz was the maximum we managed to achieve, which limited our flexibility during mainboard and CPU tests. These modules from Kingston can hardly compete with Patriot PDC5123200+XBLK memory modules, as we now get new opportunities in overclocking experiments (I already have a few ideas I could finally put into life with such a good memory as Patriot PDC5123200+XBLK).

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