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Tight Timings Or High Clock Frequencies?

Tight Timings vs High Clock Frequencies
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In an attempt to project how memory at tight timings (Winbond) compares to memory at relaxed timings and higher clock frequencies (Samsung), we ran the benchmarks using CL2.0-2-2-6 and CL3.0-4-4-7 at different clock speeds. We experienced very strange performance scaling when using a 9x CPU multiplier and different memory speed dividers. The results didn't form a curve, so we had to settle with a 7x CPU multiplier, resulting in a CPU speed of 2,030 MHz.

We see here that at the different tested memory speeds, tight timings outperform relaxed timings by 3.2% to 4.1% in SuperPI, and 2.3% to 4.4% in 3DMark01. Unfortunately, our CPU speed of 2030 MHz is acting as a bottleneck when the memory frequency is increased, which takes away the significance of tightening the timings.

At a 1450 MHz core clock and 193 MHz memory frequency, the difference between tight and relaxed timings in 3DMark01 is 1.9%; at 2030 MHz it is 2.3%, and at 2610 MHz it is 5.7%. It's not unreasonable to then guess that if we were to double the increase in clock speed from 2030 to 3190 MHz (instead of to 2610 MHz), we might see a difference in the area of 8-12%, if the memory speed were kept the same.

On the next page you will find a scaling trend curve based on both the results above and the ones we presented earlier in the benchmark section.

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