Intel Core i7-4790K – Devil’s Canyon Review and Overclocking

Heading the pack of Intel’s new Haswell-refresh range of processors is the Core i7-4790K, which essentially is still the quad-core Haswell processor that’s built on Intel’s 22nm process technology but with a few changes.

Intel Core i7-4790K - Devil's Canyon Review and Overclocking

The DC range of Haswell processors come with improved thermal interface material (TIM) and this change could improve cooling performance. It also has added capacitors to the back of the processor to improve power delivery.

The Core i7-4790K (and also the Core i5-4690K) comes with support for both Intel’s VT-d virtualization IO technology and Intel’s TSX-NI transactional memory instructions.

Processor Details

Here’s a quick summary of the Intel Core i7-4790K.
Intel Core i7-4790K - Devil's Canyon Review and Overclocking
Full details at Intel ARK.

CPU-Z capture.
Intel Core i7-4790K - Devil's Canyon Review and Overclocking

Here’s the CPU-Z details of my overclock.
Intel Core i7-4790K - Devil's Canyon Review and Overclocking

Test Setup & Overclocking

RAMKingston HyperX 2x 4GB 2400Mhz
MotherboardASUS Maximus VII Ranger
CoolerDeepCool Lucifer
Power SupplyCooler Master V700
Operating SystemWindows 8 Pro 64bit

The Engineering Sample used in this review doesn’t seem to be one of those great overclockers. I’ve read other reviews on how they only managed to squeeze 4.7Ghz with 1.36 vcore – I can could reach 4.7Ghz but it will fail the test barely even halfway through, with temperatures barely hitting mid 80c. The ES here however is very comfortable at 4.6Ghz with 1.30 vcore.


I disabled turbo boost for the test, running all cores at maximum rated clock speed.

x264 – 10bit to 8bit Video Conversion

The source video is a 720p MKV file that is 90 seconds in duration. x264 settings at the slowest.

CPUTime Taken
Intel Core i7 4790K @ 4Ghz167 seconds
Intel Core i7 4790K @ 4.6Ghz144 seconds
AMD FX-9590165 seconds
AMD FX-8350188 seconds
Intel Core i5-4670K228 seconds

Cinebench R15

Default settings

CPUTime Taken
Intel Core i7 4790K @ 4Ghz917
Intel Core i7 4790K @ 4.6Ghz801

Sorry, no results from the other processors as they were done on an older version of Cinebench that uses different unit measurements.


Speed of archiving some almost 1GB worth of CR2 and MOV file.

CPUTime Taken
Intel Core i7 4790K @ 4Ghz33 seconds
Intel Core i7 4790K @ 4.6Ghz39 seconds
AMD FX-959046 seconds
AMD FX-835057 seconds

Power Consumption

Power Consumption measurement is based on readings taken from watt-meter. Power consumption is based on entire system, the FX systems are paired with the Radeon HD 6670 graphic card for video output.

CPUIdle (W)Peak (W)
Intel Core i7 4790K @ 4Ghz31101
Intel Core i7 4790K @ 4.6Ghz33152
AMD FX-959061301
AMD FX-835060191

Temperature’s lab temperature is set at +/- 25°C

CPUIdle (°C)Load (°C)
Intel Core i7 4790K @ 4Ghz3258
Intel Core i7 4790K @ 4.6Ghz3277
Intel Core i7 4790K @ 4Ghz with stock cooler3381

The Verdict

The Intel Core i7-4790K is expected to retail at the last price of the i7-4770K which is around RM 1,100 while the i7-4770K’s price would be lowered.

Enthusiasts or casual users, upgrading from the i7-4770K to i7-4790K doesn’t seem like a bad idea at all as i7-4790K has a 500Mhz increase from the i7-4770K’s base and Turbo boost clocks.

goldfries recommended

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