Bandwidth, latency, and HEXUS.PiFast
| Sisoft Sandra 2009 SP2 (15.72) - float buffered | |||||
|---|---|---|---|---|---|
| Intel Core 2 Quad Q8200 | Intel Core i7 920 | AMD Phenom II 920 | Intel Core 2 Quad Q9300 | AMD Phenom X4 9950 BE | AMD Phenom II 940 BE |
| 6.51 | 18.9 | 11.83 | 6.6 | 9.53 | 11.91 |
The Phenom IIs, running DDR2-1,066MHz memory, pull out a comfortable lead over the two Intel Core 2 Quads and the Phenom 9950 BE, which is the only processor in the line-up to use DDR2-800 RAM.
Intel's tri-channel memory-controller on the Core i7 pays massive bandwidth dividends, according to Sandra, producing almost 20GB/s.
| Sciencemark 2 memory latency | |||||
|---|---|---|---|---|---|
| Intel Core 2 Quad Q8200 | Intel Core i7 920 | AMD Phenom II 920 | Intel Core 2 Quad Q9300 | AMD Phenom X4 9950 BE | AMD Phenom II 940 BE |
| 47.15 | 38.9 | 54.53 | 46.2 | 59.49 | 55.52 |
Latency, too, is better on the new Phenoms, but not quite as good as the Intel trio.
| HEXUS.PiFast - calculation to 10m places | |||||
|---|---|---|---|---|---|
| Intel Core 2 Quad Q8200 | Intel Core i7 920 | AMD Phenom II 920 | Intel Core 2 Quad Q9300 | AMD Phenom X4 9950 BE | AMD Phenom II 940 BE |
| 40.58 | 32.96 | 38.61 | 37.47 | 45.48 | 36.58 |
Bringing it together in the number-crunching HEXUS.PiFast test, we see that sheer clock-speed elevates the Phenom II 940 above the price-comparable Core 2 Quad Q9300. It's still some way shy of the Core i7 920, however.
