Intel Pentium 840 

Released May, 2005
  • 3.2 GHz
  • Dual core
  • Unlocked
4.6 Out of 10

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CPUBoss Review Our evaluation of the Intel Pentium 840 among desktop CPUs (over 75W)

Performance

Benchmark performance using all cores

Pentium 840
3.9
PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

Pentium 840
4.5
PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Pentium 840
0.0
Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

Pentium 840
0.0
CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Pentium 840
5.0
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Pentium 840
n.d.
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

4.6

CPUBoss Score

Combination of all six facets

Pentium 840
4.6

Benchmarks Real world tests of the Intel Pentium 840

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Pentium 840
1,544

GeekBench 3 (Single core) Data courtesy Primate Labs

Pentium 840
881

GeekBench 3 (AES single core) Data courtesy Primate Labs

Pentium 840
114,300 MB/s
Pentium D 820
100,200 MB/s
Pentium D 945
122,800 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Pentium 840
1,504

GeekBench (64-bit) Data courtesy Primate Labs

Pentium 840
2,521

GeekBench

Pentium 840
2,521

Specifications Full list of technical specs

summary

Clock speed 3.2 GHz
Cores Dual core
Socket type LGA 775
Is unlocked Yes

features

Has a NX bit Yes
Supports trusted computing No
Has virtualization support No
Instruction set extensions
  1. MMX
  2. SSE
  3. SSE2
  4. SSE3
Supports dynamic frequency scaling Yes

power consumption

TDP 130W
Annual home energy cost 31.32 $/year
Annual commercial energy cost 113.88 $/year
Performance per watt 0.83 pt/W
Typical power consumption 105.63W

memory controller

Memory controller Built-in
Supports ECC No

details

Architecture x86-64
Threads 4 threads
L2 cache 2 MB
L2 cache per core 1 MB/core
Manufacture process 90 nm
Transistor count 230,000,000
Max CPUs 1
Clock multiplier 16
Voltage range 1.2 - 1.4V
Operating temperature Unknown - 69.8°C

overclocking

Overclocked clock speed 3.2 GHz
Overclocked clock speed (Water) 3.2 GHz
PassMark (Overclocked) 833.7
Overclocked clock speed (Air) 3.2 GHz

integrated graphics

GPU None

bus

Architecture FSB
Clock speed 800 MHz
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