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LOSTCIRCUITS
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| Low Power and Energy-Efficient CPUs from Intel and AMD Core2 Duo E6300 vs. X2-3800+ (ADD) and X2-4600+ (ADO) | |
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(Review by MS, August 20, 2006) |
Memory Subsystem II
Access Latencies Athlon 64 4600+ vs 5000+:
The 4600+ (solid blocks) shows slightly better access latencies across the board than the 5000+
One of the biggest issues originally associated with DDR2 were its access latencies compared to the first generation DDR. DDR2 has come a long way though and especially the 800 MHz versions not only increase the overall throughput but also effectively cut the nominal latencies in half. Also, the controllers are getting better and better. In other words, we thought it was, once again, time for a reevaluation of the two different technologies in a direct comparison using identical speed grades of CPU with the same cache size. In this case, we are using the Socket 939 X2-3800+ on an ASUS A8N-SLI board with 2 x 512 MB of low latency PC3200 DDR at 2:2:2:7 vs. the AM2 "ADD" X2-3800 on the Foxconn "C51" board with 2 x 1024 MB of PC6400 DDR2 at 4:4:4:12 (CL:tRCD:tRP:tRAS).
Against all odds, the AM2 (DDR2) platform (solid blocks) shows lower (better) access latencies than the DDR(1) platform (transparent blocks) with nominally lower latency memory. On second thought, however, everything else being equal, the lesser bus contention of the DDR2 technology appears to finally pay of.
AMD vs. Intel
Finally we have a direct comparison between the AM2 X2-3800 (green) against the E6300 (blue) across different data chunk sizes at 2 kB Stride length. Note the increase in latency at the 2MB block size caused by the half-cache size limitation of 2MB.
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Athlon64 X2-3800+ (ADA3800DAA5CD) | |
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Core2 Duo E6300 (HH80557PH0362M) |
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