Bandwidth and memory analysis
| ScienceMark 2 memory latency | |||||
|---|---|---|---|---|---|
| Intel Core i5 750 | AMD Phenom II X4 965 BE | AMD Phenom II X4 905e | Intel Core i5 661 | Intel Core 2 Duo E8500 | Intel Core 2 Quad Q9400 |
| 35.9 | 50.94 | 52.16 | 51.93 | 54.96 | 53.26 |
Memory-access latency isn't quite as good as the other IMC-clad Intel chip in this test, Core i5 750, and we can infer that the need for the CPU die to run across the QPI interconnect introduces obvious delays.
| Sisoft Sandra 2010 (16.11) - float buffered | |||||
|---|---|---|---|---|---|
| Intel Core i5 750 | AMD Phenom II X4 965 BE | AMD Phenom II X4 905e | Intel Core 2 Duo E8500 | Intel Core i5 661 | Intel Core 2 Quad Q9400 |
| 16.29 | 13.22 | 12.61 | 6.56 | 11.5 | 6.51 |
It's clear to see which CPUs use an integrated memory-controller and which don't. Both Core 2 chips communicate with their MCH over a front-side bus. Core i5 661 does reasonably well here.
| HEXUS.PiFast - calculation to 10m places | |||||
|---|---|---|---|---|---|
| Intel Core i5 750 | AMD Phenom II X4 965 BE | AMD Phenom II X4 905e | Intel Core 2 Duo E8500 | Intel Core i5 661 | Intel Core 2 Quad Q9400 |
| 27.48 | 32.04 | 42 | 29.87 | 25.8 | 35.79 |
The single-threaded number-crunching test that is HEXUS.PiFast examines floating-point performance. Spurred on by a relatively high clockspeed and Turbo Boost, the '661 is the fastest of the sub-£150 bunch.
