DDR2 SDRAM for Overclocking Fans: Getting Beyond 1GHz. Page 8
[08/22/2005 12:54 PM | Memory]
by Ilya Gavrichenkov
Using new overclocker-friendly modules of DDR2 SDRAM – Corsair TWIN2X1024A-5400UL, Mushkin XP2-6400 DDR2 and OCZ DDR2 PC2-8000 Platinum Enhanced Latency Dual Channel – we are going to check the performance of Pentium 4 systems with DDR2-1067 and DDR2-800 SDRAM. You will also see how memory frequency and timings affect the overall performance of a Pentium 4 platform.
The final preliminary remark is that not all i955/i945-based mainboards support the 1:1 memory divisor. So, you have to be careful about your choice of the mainboard, not only of the memory modules, in order to build an advanced computer with high-speed memory.
That said, we can at last get to our tests. First, here are some tests that measure the effective bandwidth and latency of the memory subsystem.
As you can see, timings and frequency affect the real performance of DDR2 SDRAM quite heavily. Note that this is conspicuous even despite the limited bandwidth of the processor bus which is no higher than the bandwidth of DDR2-533 SDRAM with Pentium 4 systems.
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