Now with the potential for some decent overclocking action, the Phenom II X4 processors represent a much better value than the originals ever were. However, it's unfortunate to see that the 20% clock frequency increase didn't make the Phenom II X4 940 significantly faster in many of the real-world tests we threw at it, and there are a few possible reasons for that. Unlike the Core 2 Duo processors that are overclocked by increasing the FSB - effectively raising the frequency of both the processor and memory - the Phenom II X4 940 Black Edition is best overclocked using the clock multiplier. The Phenom II processors are still intolerable to FSB injections, and increasing the bus will almost always create problems in achieving a decent stable overclock. While it's very easy to throw a 400MHz FSB at Core 2 processors, this is simply not the case with the Phenom II X4. That's also why purchasing a Black Edition processor becomes a must for those planning on carrying out a little overclocking.