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8:29 AM - 02/27/2006 by
The editorial team
We conducted the following latency timing test with an FSB speed of 1066 (266 MHz) using the premium Corsair CM2X512-8000UL memory modules.
An overview of speed improvements as they relate to latency timings:
| Module Latency Speed (CL X.0-3-3-8) FSB 1066 | |||
|---|---|---|---|
| Latency | Read | Write | Latency |
| CL 3.0 | 7458 MB/sec | 2499 MB/sec | 76.9 ns |
| CL 4.0 | 7435 MB/sec | 2447 MB/sec | 80.1 ns |
| CL 5.0 | 7405 MB/sec | 2375 MB/sec | 81.9 ns |
| Latency | Read | Write | Latency |
| CL 3.0 | 100.7 % | 105.2 % | 106.5 % |
| CL 4.0 | 100.4 % | 103.0 % | 102.2 % |
| CL 5.0 | 100 % | 100% | 100% |
Even at a high FSB speed of 1066, boosting CAS latency to 3.0 barely improves memory read speeds, but memory write speeds improve on the order of 5%.
The speed improvement that results from tightening latency timings at an FSB speed of 800 (200 MHz) is likewise only minimal. Thus, it makes no sense to leave the FSB speed unchanged, and only boost memory timings. This strategy does not offer enough gains to justify purchasing high performance, but more expensive, low-latency RAM.
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