CPUBoss Review Our evaluation of 820QM vs 620M among laptop CPUs (over 15W)

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

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

Integrated Graphics

Integrated GPU performance for graphics

Sky Diver and Cloud Gate

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

No winner declared

Too close to call

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VS

Differences What are the advantages of each

Front view of Intel Core i7 820QM

Reasons to consider the
Intel Core i7 820QM

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CPUBoss is not aware of any important advantages of the 820QM vs the 620M.

Front view of Intel Core i7 620M

Reasons to consider the
Intel Core i7 620M

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required

Benchmarks Real world tests of Core i7 820QM vs 620M

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i7 820QM
120,500 MB/s
Core i7 620M
1,530,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 820QM  vs
620M 
Clock speed 1.73 GHz 2.66 GHz
Turbo clock speed 3.06 GHz 3.33 GHz
Cores Quad core Dual core
Socket type
rPGA 988A
BGA 1288
Is unlocked No No

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 45W 35W
Annual home energy cost 10.84 $/year 8.43 $/year
Performance per watt 3.14 pt/W 17.77 pt/W
Typical power consumption 36.56W 28.44W

bus

Architecture DMI DMI
Number of links 1 1
Transfer rate 2,500 MT/s 2,500 MT/s

details

Core i7 820QM  vs
620M 
Architecture x86-64 x86-64
Threads 8 4
L2 cache 1 MB 0.5 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 4 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 45 nm 32 nm
Transistor count 774,000,000 382,000,000
Max CPUs 1 1
Clock multiplier 13 20

overclocking

Overclocked clock speed 2.71 GHz 3.34 GHz
Overclocked clock speed (Water) 1.73 GHz 2.67 GHz
Overclocked clock speed (Air) 2.71 GHz 3.34 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics
Number of displays supported N/A 2
GPU clock speed N/A 500 MHz
Turbo clock speed N/A 766 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3
DDR3-800
Channels Dual Channel Dual Channel
Supports ECC No No
Maximum bandwidth 21,333.32 MB/s 17,066.66 MB/s
Maximum memory size 8,192 MB 8,192 MB
Intel Core i7 820QM
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Intel Core i7 620M
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