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OCZ Titanium PC3-1600 2GB kit
Even though DDR3 is a new technology OCZ has a total of eight different DDR3 memory products in its extensive range. There's a FlexXLC kit that you can plumb into your water cooling set-up, three Gold series mainstream kits that are relatively slow, four high-end Platinum kits that use Elpidia memory chips and at the top of the pile there's a single Titanium series kit that uses the fastest Micron chips that are on the market.
This is OCZ PC3-12800 Titanium Edition which has an effective speed of 1,600MHz and costs £352.44 for a 2x 1GB kit which is an awfully high price for memory. I still test with Windows XP, rather than Windows Vista so 2GB of memory is perfectly adequate but if we were using Vista we'd want 4GB installed.
Besides its colossal speed the Titanium memory supports Intel XMP (Extreme Memory Profiles), which means that it contains a set of SPD (Serial Presence Detect) settings that automatically tighten the memory timings when you use a suitable motherboard with an Intel X38 chipset.
Right now we don't have an X38 motherboard with DDR3 support to hand. We did last week and we will next week, and will indeed be using this OCZ memory for that review but today we're reviewing the OCZ Titanium on an Asus P5K3 Deluxe. The P35 chipset officially supports DDR3-1066 but Asus has added support for DDR3-1333 and we had no trouble running the Titanium at 1,600MHz. With this 1,600MHz memory the Asus BIOS offers four memory multipliers (1.0x, 1.2x, 1.6x and 2.0x).
When we installed some OCZ DDR3-1333 for comparison purposes we had a choice of seven memory speeds.
The E6750 Core 2 Duo we used in testing runs on a nominal 1,333MHz FSB which has a true speed of 333MHz. By contrast the OCZ Titanium has a maximum nominal speed of 1,600MHz DDR which is a true clock speed of 800MHz. As the maximum memory multiplier on the Asus is 2.0x the only way we can run the OCZ Titanium at full speed is to overclock the 333MHz FSB Core 2 Duo E6750 to 400MHz. Once you hit 1,600MHz, say with an FSB of 410MHz you're faced with the choice of overclocking the memory or dropping the multiplier to 1.6x so the CPU runs faster while the memory speed drops slightly.
Naturally I had concerns about not using an X38 chipset however OCZ is happy to divulge the details of the XMP settings so the starting point for the memory timings at 1,600MHz are 8-8-8-27 although the Asus slowed them slightly to 9-9-9-24. The other XMP profile is 7-6-6 although a tRAS figure is not given.