You might award that Intel will launch unlocked multiplier "Core i7-875K" and "Core i5-655K" soon, same as Pentium E6500K and AMD black box edition, both CPUs are allow the overclockers to overclock the CPU freely with unlocked multiplier.
Core i7-875K is based on 45nm Lynnfield 2.93GHz frequency with 4 cores and 8 Multi-Thread, 8MB L3 Cache, and 95W Wattage. With the Turbo Boost accelerated, the frequency can reach up to 3.6 GHz frequency.
Core i5-655K is based on 32nm Clarkdale 3.2GHz frequency with dual cores and 4 Multi-Thread, 4MB L3 Cache, and 73W Wattage. With the Turbo Boost accelerated, the frequency can reach up to 3.46 GHz frequency.
Core i7-875K, Corei7-860, and Core i5-660 comparison
Test System
CPU：Intel Core i7 875K unlock
RAM：AVEXIR DDR3 2GB x 2
MB：GIGABYTE P55A-UD6
VGA：Nvidia GTX480
HHD：A-DATA S599 100GB
POWER：SilverStone ST1200
COOLING：AIR Cooling
OS: WIN7 X64
[youtube]http://www.youtube.com/watch?v=zTPsHdtsML4&feature=player_embedded#![/youtube]
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Unlock Test 28x + Turbo 2 Ratio
Fritz Chess Test
CINEBENCH R11.5 Test
wPrime 2.0
When we activate the Turbo Boost during the testing, the multiple frequency of unlocked Core i7-875K CPU will be increased twice.
To be short, when we set 28 multiple frequency FSB133 and activate Turbo Boost, the CPU will be operated (28+2) x 133 = 4000, but we are not sure if it is BIOS issues.
133 x 30 = 4GB
200x 20 = 4GB
Although the CPU multiplier is unlocked, if the CPU quality is not good enough, the required voltage will be the same, even is running 4GHz frequency (133 x 30 or 200 x 20).
Perhaps, it is better to choose a high quality Core i7-860 rather than Core i7-875K.
But to those overclocking beginner, Core i7-875K is much easier to allow them enjoy the fun of overclocking.
During the testing, we have used ASUS and GIGABYTE P55 motherboards. It is unfortunately that ASUS motherboard had failed due to their BIOS issues. We are still expecting their latest BIOS that can support the CPU
Beside Core i7-875K, Intel will launch Core i7-870s with 82W Wattage. Nevertheless, the frequency will be decreased to 2.66GHz (TB/3.60GHz) and the price is around US$562. Intel will also launch Gulftown (Core i7-970) with 3.20GHz (TB/3.46GHz) frequency in Q3.
