If you use your computer to run standard desktop applications–office productivity apps, Web browsers, and so on–overclocking is not worthwhile, since the higher clock speeds won’t deliver noticeably better performance. What to Expect From Your Overclocked Processorīefore starting the physical process of overclocking, think about what you’re trying to accomplish. Still, it’s a useful tool to help with overclocking. As with all stages of overclocking, though, you have to be careful here: Changing the underlying fundamental clock frequency will change a host of other parameters. You can usually adjust the setting for an Intel CPU’s base clock (BCLK) or for an AMD processor’s CPU bus frequency to any value you want. Admittedly, you can usually set the multiplier to a lower number than the maximum rating, but it’s unclear why you’d want to do this. Some motherboards try to cheat in an effort to unlock the CPU multiplier, but in most instances involving typical retail CPUs, you can’t unlock the multiplier. Most retail processors are clock-locked, which means that you can’t increase the CPU multiplier beyond its rated speed. For example, when only one core on the Core i5 750 is in use, the Turbo Boost frequency is 3.2GHz. Note that Intel’s latest CPUs also have a feature called Turbo Boost that allows the CPU to run at clock speeds higher than the default speed under certain conditions. The main processor takes the BCLK number and multiplies it by 20 to get 2.66GHz (2666MHz)–this is the CPU multiplier. On the other hand, the rated speed of the i750 is 2.66GHz. Like almost all Intel CPUs in the Core i5/i7 line, the Core i5 750 has a BCLK of 133MHz. Let’s look at the Core i5 750 CPU for a moment. For its part, AMD calls this rate the CPU bus frequency it’s commonly set at 200MHz in AMD desktop processors. Mac world clock deluxe series#In the Intel Core i5/i7 series of CPUs, the fundamental clock rate is called the base clock or BCLK (it’s usually 133MHz). Various sections of the processor take this fundamental clock rate, which acts as a kind of standard timekeeper, and multiply it to get an internal clock speed for a particular section of the CPU. We won’t dive deeply into individual CPU architectures, but you do need to know some basic stuff.Īll CPUs have a fundamental clock rate, from which all of the other clock rates inside the CPU are derived. Likewise, unless you want to overclock your DRAM to extreme speeds, modestly priced DRAM (which we’ll be using in our examples) will work fine. The $300+ motherboards that gave rise to this myth are luxuries for people bent on extreme overclocking (which requires certain special features). We’ll look at examples involving a fairly high-end motherboard (roughly $250), a $190 board, and a micro-ATX board that’s priced around $140. Myth #3: Overclocking requires expensive motherboards and memory. That caveat is well worth keeping in mind when you attempt to overclock. Consequently, the fact that your buddy down the street can run a Core i5 750 (rated at 2.66GHz) at 4GHz doesn’t mean that your Core i5 750 CPU can will be able to run that fast. Myth #2: Different iterations of the same chip have the same capacity for overclocking.īecause the manufacturing yield is a statistical distribution, you’ll probably get a CPU that can run much faster the listed speed, but you might end up with a processor that runs only about 10 percent faster. In other words, since the statistical distribution in the manufacturing process is skewed toward better-quality chips, odds are that your processor is better than its rated speed. In general, CPU yields are so good these days that the nominal speed grade locked into a chip may be far lower than the speed that the chip is capable of running a computer at. Processors don’t instantly melt when you overclock them because a modern CPU’s speed rating specifies the speed at which every processor in the same manufacturing batch cano run–a number that’s likely to be considerably lower than the maximum speed that your specific processor is capable of. This article will focus primarily on CPU overclocking to illustrate the core concepts (pun intended). Overclocking a Core i7 860 means pushing it to a clock speed higher than 2.80GHz. For example, an Intel Core i7 860 runs at 2.80GHz out of the box. Almost all processors ship with a speed rating. Microprocessors.Simply put, overclocking means setting your CPU and memory to run at speeds higher than their official speed grade. Memory and CPUs are intricately interconnected, and simply pumping up the speed of one or the other may not yield the performance improvements you want to achieve. We will, however, talk about core CPU multipliers and memory clocks, and how the two relate to each other.
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