AMD Athlon II X4 645 

Released September, 2010
  • 3.1 GHz
  • Quad core
5.1 Out of 10

The Athlon II X4 645 isn't quite as cheap as we'd like, but it's still extremely affordable and delivers excellent threading performance for the money.
by Tech Radar (Nov, 2010)
That's especially true if gaming performance is a high priority.
by Tech Radar (Nov, 2010)

CPUBoss Review Our evaluation of the AMD Athlon II X4 645 among desktop CPUs (over 75W)

Performance

Benchmark performance using all cores

Athlon II X4 645
5.1
PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

Athlon II X4 645
5.2
PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Athlon II X4 645
0.0
Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

Athlon II X4 645
0.0
CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Athlon II X4 645
5.6
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Athlon II X4 645
n.d.
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

5.1

CPUBoss Score

Combination of all six facets

Athlon II X4 645
5.1

Benchmarks Real world tests of the AMD Athlon II X4 645

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Athlon II X4 645
5,422
Core i5 3570K
10,311

GeekBench 3 (Single core) Data courtesy Primate Labs

Athlon II X4 645
1,587

GeekBench 3 (AES single core) Data courtesy Primate Labs

Athlon II X4 645
124,500 MB/s
Core i5 3570K
2,650,000 MB/s
Phenom II X4 955
129,850 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Athlon II X4 645
5,270
Core i5 3570K
10,832

GeekBench (64-bit) Data courtesy Primate Labs

Athlon II X4 645
5,652
Core i5 3570K
11,824

GeekBench

Athlon II X4 645
7,301
Core i5 3570K
15,009

PassMark Data courtesy Passmark

Athlon II X4 645
3,518

PassMark (Single Core)

Athlon II X4 645
1,080

Reviews Word on the street for the AMD Athlon II X4 645


8.0
Likewise, 17 frames per second compared to 20 frames per second when video encoding is surely close enough.

What People Are Saying Give it to me straight

Socket Type

The 2.6GHz 620 model can be had for around £65.
by Tech Radar (Nov, 2010)
Admittedly, the 645's 50fps average looks okay, but the occasional choppiness in our World of Conflict benchmark is unmistakable.
by Tech Radar (Nov, 2010)
A four-core chip for chump change is an attractive idea.
by Tech Radar (Nov, 2010)

Socket

The Athlon II models must survive with 512KB L2 per core.
by Tech Radar (Nov, 2010)
In other words, we're talking four 45nm cores complimented by AMD's on-die memory controller and speedy HyperTransport interconnect.
by Tech Radar (Nov, 2010)
The cut-down cache hurts the 645's framerates.
by Tech Radar (Nov, 2010)

Performance

Where the performance gap is more critical is gaming.
by Tech Radar (Nov, 2010)

Multicore

The AMD Athlon II X4 645 is a quad-core chip based on the finest processor cores AMD can currently muster, despite being a budget CPU.
by Tech Radar (Nov, 2010)

Applications

We reckon few people will really notice that their CPU completes a 3D rendering job in one minute and 16 seconds rather than the minute flat of the more powerful quads from AMD and Intel.
by Tech Radar (Nov, 2010)

Specifications Full list of technical specs

summary

Clock speed 3.1 GHz
Cores Quad core
Socket type AM3
Is unlocked No

features

Has a NX bit Yes
Has virtualization support Yes
Instruction set extensions
  1. SSE4a
  2. 3DNow!
  3. SSE2
  4. SSE
  5. MMX
  6. SSE3
Supports dynamic frequency scaling Yes

integrated graphics

GPU None

bus

Clock speed 2,000 MHz

details

Architecture x86-64
Threads 4 threads
L2 cache 2 MB
L2 cache per core 0.5 MB/core
L3 cache 0.5 MB
L3 cache per core 0.13 MB/core
Manufacture process 45 nm
Max CPUs 1
Voltage range 1.05 - 1.4V
Operating temperature Unknown - 71°C

overclocking

Overclock popularity 15
Overclocked clock speed 3.65 GHz
Overclocked clock speed (Water) 3.1 GHz
PassMark (Overclocked) 2,068.5
Overclocked clock speed (Air) 3.65 GHz

power consumption

TDP 95W
Annual home energy cost 44.01 $/year
Annual commercial energy cost 121.5 $/year
Performance per watt 1.26 pt/W
Idle power consumption 75W
Peak power consumption 138.7W
Typical power consumption 122.78W
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