Intel Core i7 3820 

Released February, 2012
  • 3.6 GHz
  • Quad core
  • Unlocked
5.6 Out of 10

By reaching 4.5 GHz with minimal effort and with only aftermarket air cooling how can you not have fun with the Core i7-3820?
by Legit Reviews (Feb, 2012)
If we were building a high-end desktop system today and wanted to do so on a budget we would go with LGA2011 and the Intel core i7-3820.
by Legit Reviews (Feb, 2012)

CPUBoss Review Our evaluation of the Intel Core i7 3820 among desktop CPUs (over 75W)


Benchmark performance using all cores

Core i7 3820
PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

Core i7 3820
PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Core i7 3820
Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

Core i7 3820
CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Core i7 3820
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more


Are you paying a premium for performance?

Core i7 3820
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more


CPUBoss Score

Combination of all six facets

Core i7 3820

Benchmarks Real world tests of the Intel Core i7 3820

CompuBench 1.5 (T-Rex) Data courtesy CompuBench

Core i7 3820
0.76 fps
Core i7 3770
-1 fps
Core i7 3770K
1.67 fps

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i7 3820
Core i7 3770K
Core i7 3770

GeekBench 3 (Single core) Data courtesy Primate Labs

Core i7 3820
Core i7 3770

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i7 3820
2,500,000 MB/s
Core i7 3770
2,660,000 MB/s
Core i7 3770K
2,620,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core i7 3820
Core i7 3770K
Core i7 3770

GeekBench (64-bit) Data courtesy Primate Labs

Core i7 3820
Core i7 3770K
Core i7 3770

PassMark Data courtesy Passmark

Core i7 3820
Core i7 3770

PassMark (Single Core)

Core i7 3820
Core i7 3770

Reviews Word on the street for the Intel Core i7 3820

But compared with the Core i7-3830K, you won’t see much of a difference in single-threaded applications: Both chips scored the same (1.53) in the CineBench R11.5 single-core test, showing where you can save money if you don’t heavily depend on highly threaded programs.

Predictably things are pretty close in terms of raw performance.

It's a great chip if you want to reap the benefits of X79 and also be on a socket that will have some longevity.


8.7 Out of 10

What People Are Saying Give it to me straight

Socket Type

The performance of the Intel Core i7-3820 was significantly better thanks to overclocking as one could imagine.
by Legit Reviews (Feb, 2012)
Gamers and enthusiasts that need more than the 16 lanes of PCI-Express that Sandy Bridge processors offer should also look to LGA2011 as it has 40 integrated PCI-E lanes along with native PCI-E 3.0 support.
by Legit Reviews (Feb, 2012)
The Intel Core i7-3820 quad-core processor might be just partially unlocked, but it was a blast to use and overclock.
by Legit Reviews (Feb, 2012)


We picked the 1.25x profile as it goes up to 4.63 GHz versus the 1.00x profile that it went up to.
by Legit Reviews (Feb, 2012)
We tried to get the Intel Core i7-3820 to run at 4.63 GHz, but it would blue screen during the Windows loading process.
by Legit Reviews (Feb, 2012)
HandBrake 0.9.5 does support 12-threads, but as you can see above it only used about 80-95% of the available processing power.
by Legit Reviews (Feb, 2012)


On core-for-core performance, you're not getting much extra for your Sandy Bridge E money.
by Tech Radar (Jan, 2012)
But that means it's still bigger than the previous generation's Gulftown hex-core CPUs, the entire Sandy Bridge lineup and even AMD's chunky quad-module Bulldozer chips.
by Tech Radar (Jan, 2012)
Is this huge processor the same, is it really carrying around four dead cores in its innards?
by Tech Radar (Jan, 2012)


Thanks to the BCLK strap, the Sandy Bridge E chips are able to withstand a good tweaking of the base clock.
by Tech Radar (Jan, 2012)
Our readers have been asking for more than performance numbers when it comes to overclocking, so let's take a look at what happens to the processor temperature, power consumption and overall system performance with this overclock.
by Legit Reviews (Feb, 2012)
This might prove to be interesting as the Core i7-3820 may end up beating the flagship desktop processor on certain workloads that aren't threaded for high-end processors that have up to 12 threads available.
by Legit Reviews (Feb, 2012)


In single-threaded applications the straight Sandy Bridge architecture has the edge in our test, showing why the gaming performance is higher as well.
by Tech Radar (Jan, 2012)
In single-threaded applications, the straight Sandy Bridge architecture has the edge in our test, showing why the gaming performance is higher as well.
by Tech Radar (Jan, 2012)
There will be instances where the Intel Core i7 3820 and X79 combo will be beneficial, for the offline 3D rendering workstation or other serious productivity tasks that don't necessarily require heavy multi-threading.
by Tech Radar (Jan, 2012)

Specifications Full list of technical specs


Clock speed 3.6 GHz
Turbo clock speed 3.8 GHz
Cores Quad core
Socket type LGA 2011
Is unlocked Yes


Has a NX bit Yes
Supports trusted computing No
Has virtualization support Yes
Instruction set extensions
  1. MMX
  2. AES
  3. SSE
  4. SSE2
  5. SSE4.1
  6. SSE3
  7. Supplemental SSE3
  8. SSE4.2
  9. AVX
  10. SSE4
Supports dynamic frequency scaling Yes

integrated graphics

GPU None

memory controller

Memory controller Built-in
Memory type
  1. DDR3-1600
  2. DDR3-1333
  3. DDR3-1066
  4. DDR3
Channels Quad Channel
Supports ECC No
Maximum bandwidth 51,200 MB/s
Maximum memory size 65,771.52 MB


Architecture x86-64
Threads 8 threads
L2 cache 1 MB
L2 cache per core 0.25 MB/core
L3 cache 10 MB
L3 cache per core 2.5 MB/core
Manufacture process 32 nm
Transistor count 1,270,000,000
Max CPUs 1
Clock multiplier 36
Voltage range 0.6 - 1.35V
Operating temperature Unknown - 66.8°C


Overclock popularity 142
Overclock review score 5
Overclocked clock speed 4.68 GHz
Overclocked clock speed (Water) 4.71 GHz
PassMark (Overclocked) 5,531.8
Overclocked clock speed (Air) 4.68 GHz

power consumption

TDP 130W
Annual home energy cost 49.49 $/year
Annual commercial energy cost 138.93 $/year
Performance per watt 6.18 pt/W
Idle power consumption 82.6W
Peak power consumption 158.6W
Typical power consumption 139.6W


Architecture DMI 2.0
Transfer rate 5,000 MT/s
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