If we divided into Chipset, P55 is mainly for Core i5-750/Core i7-860 and 870.
They are 4C/4T or 4C/8T structure, more CPU Cores, better performance and ATX form factor MB.
Another 2 chipset are H55/H57. H57 is not popular due to its high price.
H55 is mainly for All In One. The CPU built-in GPU is the new design.
Main CPU product line has Core i3-5X0/Core i5-6X0 2 series, and they are 2C/4T Cores mainly.
Of course, both series CPU can be installed with P55/H55.
But P55 has no VGA output function, you still need external VGA with Core i3-5X0/Core i5-6X0.
Core i5-750/Core i7-860、870 CPU don’t built-in GPU. Even install in H55still need external VGA.
Users need to understand the LGA 1156 features you need to pay attention to.
Normally, Intel has un-locked CPU known as Extreme Edition.
The price usually is around 999USD. The models are LGA 1336 Core i7 965/975/980X.
Or LGA 775 platform has QX6850/QX9775. The models above are Intel Extreme Edition un-locked CPU.
LGA 1156 hasn’t seen this segment CPU since launched.
Intel finally launched 2 LGA 1156 Unlock CPU on 6/1.
The code is Core i7-875K for P55 MB and Core i5-655K for H55/H57 MB.
LGA 1156 platform unlock CPU called K series.
This review is about Intel Core i7-875K
Clock is 2.93GHz, supports Turbo Boost can reach 3.6GHz performance.
Physical 4 Cores with Hyper-Threading, total can achieve 8 threads named 4C/8T.
45nm manufacturing, 8MB L3 Cache and it’s all top spec in LGA 1156.
![Image](http://img534.imageshack.us/img534/9026/i7875k01.jpg)
Core i7-875K back can see the difference in every version and design.
![Image](http://img443.imageshack.us/img443/4370/i7875k02.jpg)
MB is GIGABYTE P55A-UD4P, which is hi-end P55 design and spec.
The price is around 7000NTD. In P55 market, it’s mid-high end market position.
![Image](http://img295.imageshack.us/img295/7540/i7875k03.jpg)
Smart Dual LAN, 3X USB Power, On/Off Charge port.
The features above are GIGABYTE main technology for UD4P.
![Image](http://img685.imageshack.us/img685/6096/i7875k04.jpg)
Support SATA3 and ATI CrossFireX
![Image](http://img88.imageshack.us/img88/9210/i7875k05.jpg)
Provide CPU 12-phase PWM, and 2-phase for memory.
![Image](http://img340.imageshack.us/img340/1139/i7875k06.jpg)
Configuration
CPU: Intel Core i7-875K
MB: GIGABYTE P55A-UD4P
DRAM: CORSAIR DOMINATOR-GT CMG4GX3M2A2000C8
VGA: ATI Radeon HD 5830
HD: Intel X25-V 40GB RAID 0
POWER: be quiet! power4 DELUXE 530W
Cooler: Mega Shadow Deluxe Edition
OS: Windows7 Ultimate 64bit
![Image](http://img84.imageshack.us/img84/1445/i7875k07.jpg)
Default Setting
CPU 133.2 X 24 => 3197.8MHz
DDR3 1598.8 CL6 6-6-24 1T
Hyper PI 32M X8=> 18m 33.250s
CPUMARK 99=> 496
![Image](http://img4.imageshack.us/img4/3293/i7875kdpi.png)
CrystalMark 2004R3 => 236739
![Image](http://img188.imageshack.us/img188/8792/i7875kdcm.png)
CINEBENCH R11.5
CPU => 5.44 pts
CPU(Single Core) => 1.08 pts
![Image](http://img801.imageshack.us/img801/548/i7875kdcb.png)