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Differences What are the advantages of each

Front view of Intel Core i7 4790

Reasons to consider the
Intel Core i7 4790

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Slightly higher turbo clock speed 4 GHz vs 3.9 GHz Around 5% higher turbo clock speed
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Marginally newer May, 2014 vs Jun, 2013 Release date 11 months later
Front view of Intel Core i7 4770K

Reasons to consider the
Intel Core i7 4770K

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Better turbo clock speed 1,250 MHz vs 1,200 MHz Around 5% better turbo clock speed

Features Key features of the Core i7 4790  vs 4770K 

clock speed

Core i7 4790
3.6 GHz
Core i7 4770K
3.5 GHz
The Core i7-4770K is a quad-core CPU with a base clock of 3.5GHz and Turbo clock of 3.9GHz.
Core i7 4770K | by Legit Reviews (Jun, 2013)

turbo clock speed

Core i7 4790
4 GHz
Core i7 4770K
3.9 GHz
And the clock speeds were never likely to be much higher.
Core i7 4770K | by Tech Radar

L2 cache

This is an area where Intel has gone all out—L1 cache read/write bandwidth has increased doubled compared to Ivy Bridge, as has L2 bandwidth.
Core i7 4770K | by PCMag (Jun, 2013)

L3 cache

It also has integrated processor graphics, shared L3 cache, dual-channel DDR3 support up to 1600MHz and all the other usual goodies.
Core i7 4770K | by Legit Reviews (Jun, 2013)

gpu clock speed

Core i7 4790
350 MHz
Core i7 4770K
350 MHz
While the 3D performance of the integrated graphics has improved, so has display support.
Core i7 4770K | by Legit Reviews (Jun, 2013)

Specifications Full list of technical specs

summary

Core i7 4790  vs
4770K 
Clock speed 3.6 GHz 3.5 GHz
Turbo clock speed 4 GHz 3.9 GHz
Cores Quad core Quad core
Is unlocked No Yes
Is hyperthreaded Yes Yes

features

Has a NX bit Yes Yes
Supports trusted computing Yes No
Has vitualization support Yes Yes
Instruction-set-extensions
MMX
SSE
SSE4.2
AVX
SSE3
FMA3
SSE2
EM64T
F16C
Supplemental SSE3
SSE4.1
SSE4
AVX 2.0
AES
Supports dynamic frequency scaling Yes Yes

power consumption

Typical power consumption N/A 68.25W

details

Core i7 4790  vs
4770K 
Architecture x86-64 x86-64
Threads 8 8
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 22 nms 22 nms
Max CPUs 1 1

gpu

GPU GPU GPU
Label Intel® HD Graphics 4600 Intel® HD Graphics 4600
Number of displays supported 3 3
GPU clock speed 350 MHz 350 MHz
Turbo clock speed 1,200 MHz 1,250 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3-1333
Channels Dual Channel Dual Channel
Supports ECC No No
Maximum bandwidth 25,600 MB/s 25,600 MB/s
Intel Core i7 4790
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Intel Core i7 4770K
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