Intel K series relieve CPU multiplier limitation-Core i7-875K OC performance Review

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Re: Intel K series relieve CPU multiplier limitation-Core i7-875K OC performance Revi

PCMark Vantage => 15310


Core i7-875K already has very high performance at default clock as with Turbo Boost OC technology.
As per CPU utilization rate, the clock will be in between 2.93~3.60GHz. It should be affordable for most application.

Sandra Memory Bandwidth - 19460 MB/s
EVEREST Memory Read - 14717 MB/s


Even though LGA 1156 has dual channel structure, not like as triple channel in LGA 1366, so the DDR3 bandwidth is lower.
Core i7 CPU built-in Memory Controller design makes LGA1156 DDR3 bandwidth be higher than dual channel PC platform over 1.5 times more.

PSU is be quiet! latest power4 DELUXE 530W which is high C/P value product.
100% Japanese solid capacitors, 12cm low acoustic fan, 2-way 12V output designs.


In this CPU Core i7-875K and VGA HD5830 platform, it can adequate OC or high loading system.
530W is also enough for ATI CrossFireX


3D Performance
3DMark Vantage => P14430
CPU SCORE => 19866
GPU SCORE => 13224


StreetFighter IV Benchmark
1920 X 1200 => 168.64FPS


DEVIL MAY CRY4
1280 X 1024 => 146.92/131.13/182.86/100.72 fps


FINAL FANTASY XIV => 3076


3D gaming performance is relied on VGA capability.
However, the higher performance CPU can enhance 3D performance around 10-20%.
Core i7-875K performance is quite high standard, so when you use with ATI HD5380 for better 3D.

Temperature
Stnadby - 37~40


CPU Full Load - 53~59
Intel Burn Test v2.4，Stress Level Maximum


Under room temperature is 28℃, CPU full speed is still lower than 60℃.
For 4C/8T spec, Core i7-875K temperature is very good.

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Re: Intel K series relieve CPU multiplier limitation-Core i7-875K OC performance Revi

Power Consumption
Standby - 141W


CPU Full Load - 217W


CPU standby and full load power consumption difference is 76W. The difference is still in acceptable range.
The standby is 141W, but most power consumption is by hi-end VGA...

HDD Test
Using Intel mainstream version SSD, X25-V 40GB, for RAID 0


X25-V 40GB official spec is reading 170 MB/s and writing 35 MB/s


HD Tune Pro 4.01 Benchmark Average 355.9 MB/s，Access Time 0.1ms
ATTO DISK Benchmark over 128k test can achieve 392 MB/s for reading and 89 MB/s for writing.
CrystalDiskMark - 390.8 Mb/s for reading and 86.74 MB/s for writing.


FDEBENCH test result is 327.6 Mb/s for reading and 89.8 MB/s for writing.


X25-V 40GB spec is lower performance than X25-M 80GB, reading 250 MB/s and writing 70 MB/s.
However, I recommend users can buy X25-V 40GB for RAID 0. The cost is similar and the RAID0 capacity is 80GB also.
Also, X25-V RAID 0 performance can reach over 320~350 MB/s for reading and writing is similar with X25-M, is above 80 MB/s.
This combo is better than buy just one X25-M 80GB. 4K, writing performance, is also the special strength of Intel SSD.

OC Performance
First of all, you can refer to my BIOS fine tune set up for 200/2000
BIOS Main page




Core i7-875K ratio range : X9~X62


DDR3 Setup

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windwithme OC Intel Core i7-875K 4.5GHz Certified

Even if you pull the CPU voltage, CPU clock still can be higher but may not be able to pass the burning test and cannot use for long time.
I prefer to OC the system under air cooling and can be stable. It will be more useful for most users.

Intel Core i7-875K current price is around 11700NTD, about 363USD.
The previous top LGA 1156 is Core i7-870 and the price is 19000NTD, around 589USD.
The channel has off shelf the Core i7-870 and replace by 875K which is higher C/P value.
You can see Intel top LGA 1156 CPU price drop to let user pay less for buying.

The price of 875K and 860 are very close.
875K is also unlock, so the C/P is not lower than 860.
If you are planning to buy Core i7-860, you can also consider Core i7-875K.

Most user worry about the OC needs to have good capability of MB and DDR3, so they give up in the beginning.
The unlock 875K make OC be easier. The user only need to set the ratio and voltage.
I do hope Intel can have more SKU than 875K/655K. They also can consider to have more entry LGA 1156 CPU for choosing. :)