Intel Core i5 655K: Overclocking Made Easy… And Affordable!

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July 27, 2010

Unlocked multiplier means easier overclock. Instead of increasing the Base Clock frequency, which could adversely affect numerous other peripherals as well, an unlocked multiplier allows you to overclock the processor by simply raising the multiplier value. Usually this feature is reserved exclusively for the more expensive processors, such as Intel’s Extreme Edition series. Processors with unlocked multiplier were a luxury only few could afford, until recently that is.

A few months ago, Intel released the Core i7 875K, the first processor outside the Extreme Edition family that comes with an unlocked multiplier. At USS 350-375, it’s far more affordable compared to the Intel’s usual fare of unlocked processors. Now, you can find an even cheaper alternative in the market, the Core i5 655K. It retails at US$ 216 and, just like Intel’s more expensive offerings, comes equipped with an unlocked multiplier.

Intel Core i5 655K

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Specification

ProcessorIntel Core i5 655KIntel Core i5 650Intel Core i7 875K
Code NameClarkdaleClarkdaleLynnfield
Number of Cores224
Number of Threads448
Clock Speed3.2 GHz3.2 GHz2.93 GHz
Max Turbo Frequency3.46 GHz3.46 GHz3.6 GHz
L3 Cache4 MB4 MB8 MB
Bus/Core Ratio242422
Fabrication Process32 nm32 nm45 nm
Memory TypesDDR3DDR3DDR3
Memory ChannelsDualDualDual
Sockets SupportedLGA1156LGA1156LGA1156
Max TDP73 W73 W95 W
Integrated GraphicsYesYesNo
Graphics Base Frequency733 MHz733 MHz
Instruction Set ExtensionsSSE4.2SSE4.2SSE4.2
AES New InstructionYesYesNo

Like the other series in its family, the Core i5 655K is based on the 32-nm Clarkdale architecture. Aside from the integrated graphics chip, it is also armed with the new AES-NI instructions to accelerate file encryption processes. Hyperthreading technology adds the number of Core i5 655K’s logical cores from two to four, and Turbo Boost feature adjusts its clockspeed according to the current running task.

In Clarkdale series of processors, the CPU and the integrated graphics processor (IGP) units share the same TDP usage. For example, when both units are active, each of them will use 73 watts of TDP. When the user switches to add-on graphics, the IGP is turned off and more TDP becomes available for the CPU, allowing it to increase its performance. We will show this to you in one of our tests.

From the above table, you can see that the Core i5 655K is strikingly similar in terms of technical specifications with the Core i5 650. The only difference between these two is the unlocked multiplier in the Core i5 655K. The “locked version” of Core i5 655K (that is, the Core i5 650) sells for around US$ 176. So, basically, you’re paying an extra US$ 40 for the unlocked multiplier. Is it worth the money? Let’s find that out!

CPU-Z Screenshot

655k default
Core i5 655K Default Clock
655k default idle
Core i5 655K Idle Clock
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