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Will memory with higher strobe latency slow my system ?
Have Dell Precision 390 with 2 GB DDR2-532 ECC memory
in two modules, 266 MHz, CAS 4-4-4-12 per Memtest86+. This is a strobe latency of 4 cycles. Want to add two 1 GB modules to bring up to 4 GB. The closest Crucial has is DDR2-667 with strobe latency of 5 cycles. According to a chart the current modules ( strobe latency 4 cycles ) have a strobe latency of 15 ns. The Crucial modules with strobe latency 5 cycles would have latency of 18.8 ns if run at current bus speed. If these DDR2-667 modules run at the 5 cycle latency in my 266 MHz ( DDR2-532 ) bus, my memory access will be 25 % slower : ( Is this true ? Will the Crucial DDR2-667 modules revert to a strobe latency of 4 cycles when run in my 266 MHz (DDR2-532) bus ? This is an old relatively slow system ( CPU 1.8 GHz ). Doubt I can speed up the memory bus. Speed is more important to me than 4 GB memory. Should I add the Crucial modules ? Thanks, Dave WB3DWE |
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Will memory with higher strobe latency slow my system ?
On 23/09/2010 10:36 PM, Dave WB3DWE wrote:
Have Dell Precision 390 with 2 GB DDR2-532 ECC memory in two modules, 266 MHz, CAS 4-4-4-12 per Memtest86+. This is a strobe latency of 4 cycles. Want to add two 1 GB modules to bring up to 4 GB. The closest Crucial has is DDR2-667 with strobe latency of 5 cycles. According to a chart the current modules ( strobe latency 4 cycles ) have a strobe latency of 15 ns. The Crucial modules with strobe latency 5 cycles would have latency of 18.8 ns if run at current bus speed. 4 cycles/533 MHz = 7.5 ns. 5 cycles/667 MHz = 7.5 ns. It looks identical to me. What's going to happen is that since 667 MHz memory is going to be run at the slower speed of 533 MHz, it'll have a 4 cycle latency instead of 5. Yousuf Khan |
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