SiSoft Sandra 2009 - Memory	Source: Sandra

Sandra is designed to test the theoretical power of a complete system and individual components. The numbers taken though are again, purely theoretical and may not represent real world performance. Higher bandwidth and lower latencies are best.

SiSoft Sandra 2009 v15.72 - Memory - Windows Vista Multicore Efficiency Bandwidth: (GB/s) Ranking Intel Core i7 920 30.51 Intel Core 2 Duo E8500 9.57 Intel Core 2 Duo E8400 9.11 AMD Phenom II X4 965 Black Edition 4.7 AMD Phenom II X4 955 Black Edition 4.75 AMD Phenom II X3 720 Black Edition (DDR2) 3.67 AMD Phenom II X3 720 Black Edition (DDR3) 3.72 AMD Phenom II X2 550 Black Edition 3.86 AMD Athlon II X4 620 3.23 AMD Athlon II X2 250 3.06 Multicore Efficiency Latency: (ns) Ranking Intel Core i7 920 17 Intel Core 2 Duo E8500 42 Intel Core 2 Duo E8400 44 AMD Phenom II X4 965 Black Edition 95 AMD Phenom II X4 955 Black Edition 89 AMD Phenom II X3 720 Black Edition (DDR2) 83 AMD Phenom II X3 720 Black Edition (DDR3) 80 AMD Phenom II X2 550 Black Edition 103 AMD Athlon II X4 620 103 AMD Athlon II X2 250 91 Memory Bandwidth Int iSSE2: (GB/s) Ranking Intel Core i7 920 18.86 Intel Core 2 Duo E8500 6.77 Intel Core 2 Duo E8400 7.26 AMD Phenom II X4 965 Black Edition 12.24 AMD Phenom II X4 955 Black Edition 12.18 AMD Phenom II X3 720 Black Edition (DDR2) 11.38 AMD Phenom II X3 720 Black Edition (DDR3) 11.45 AMD Phenom II X2 550 Black Edition 10.3 AMD Athlon II X4 620 11.23 AMD Athlon II X2 250 10.25 Memory Bandwidth Float iSSE2: (GB/s) Ranking Intel Core i7 920 18.86 Intel Core 2 Duo E8500 6.65 Intel Core 2 Duo E8400 7.27 AMD Phenom II X4 965 Black Edition 12.2 AMD Phenom II X4 955 Black Edition 12.17 AMD Phenom II X3 720 Black Edition (DDR2) 11.41 AMD Phenom II X3 720 Black Edition (DDR3) 11.42 AMD Phenom II X2 550 Black Edition 10.26 AMD Athlon II X4 620 11.23 AMD Athlon II X2 250 10.25 Memory Latency (Random): (ns) Ranking Intel Core i7 920 81 Intel Core 2 Duo E8500 86 Intel Core 2 Duo E8400 77 AMD Phenom II X4 965 Black Edition 83 AMD Phenom II X4 955 Black Edition 83 AMD Phenom II X3 720 Black Edition (DDR2) 82 AMD Phenom II X3 720 Black Edition (DDR3) 84 AMD Phenom II X2 550 Black Edition 87 AMD Athlon II X4 620 93 AMD Athlon II X2 250 85 Memory Latency (Linear): (ns) Ranking Intel Core i7 920 9 Intel Core 2 Duo E8500 12 Intel Core 2 Duo E8400 11 AMD Phenom II X4 965 Black Edition 15 AMD Phenom II X4 955 Black Edition 15 AMD Phenom II X3 720 Black Edition (DDR2) 14 AMD Phenom II X3 720 Black Edition (DDR3) 15 AMD Phenom II X2 550 Black Edition 16 AMD Athlon II X4 620 13 AMD Athlon II X2 250 15

In these tests, higher bandwidth (GB/s) results and lower times (ns) are consider best - if you get confused, look to the Core i7 920, it sets the bar in each sub-test. AMD's socket AM2+ and AM3 processors have traditionally yielded a fair amount of latency communicating between cores, and the Athlon II X4 620 in particular suffers in the Multicore Efficiency Latency and Bandwidth benchmarks. The results improve when comparing the Memory Bandwidth that's achievable with HyperTransport versus the slower Front Side Bus of Intel's Core 2 Duo processors.