Power consumptionMoving to an engraving of 45nm has greatly reduced the power consumption of Intel processors, whether they be dual or quad core. Here’s the data obtained using hook-on ammeter at the ATX12V. Rememeber, in AMD processors, the memory controller is integrated in the processor, counting for about ten watts.
In comparison to the Q6600, the advantage of the Q8300 and the Q9300 here is obvious, with a saving of up to 27.6 watts in load! In addition to any ecological considerations, the reduced thermic output will be appreciated in terms of creating a both powerful and quiet machine.
Although this may not be a priority for everyone, overclocking is a parameter that isn’t to be ignored. It is difficult to turn your nose up at the gain in performance you can obtain free of charge by modifying a few parameters within the bios!
The Q6600 became the master of the art, it’s initial spec already a great help. To reach its frequency of 2400 MHz it applied a 9x multiplier with a bus clock of 266 MHz (with a QDR signal, FSB1066). This high multiplier gives a clock frequency of 3.6 GHz, even with the reasonable bus speed of 400 MHz (FSB1600). This clock doesn’t work with all processors of course but with the Q6600 you can reasonably expect to reach 3.4-3.6 GHz at a reasonable CPU voltage.
With the Q8200 and Q8300, it’s another story. They have a bus frequency of 333 MHz (FSB 1333) to which a 7 or 7.5 multiplier is applied. So, with an FSB of 450 MHz, you “only” get 3150 MHz on a Q8200 and 3375 MHz on a Q8300. If it were easy to increase the FSB quite a bit higher, this wouldn’t be a problem, but unfortunately this requires both processor and motherboard support.
On a P5QC ASUSTeK board based on a P45, our test Q8300 couldn’t get beyond an FSB of 470, even when we reduced its multiplier. This is what is known as the FSB Wall. Keeping the multiplier at 7.5, we were able to stabilise it at 3.4 GHz with the FSB at 453 MHz without increasing the base voltage of 1.2125v. This isn’t bad at all and at the same level as what is possible with the Q9x00, but with a Q9x50 you can easily get 3.6-3.8 GHz.