GeForce GT 640M Mac 

Released February, 2013
  • 745 MHz
  • 512 MB GDDR5
5.4 Out of 10

Benchmarks Real world tests of the GeForce GT 640M Mac

Bitcoin mining Data courtesy CompuBench

GeForce GT 640M Mac
12.55 mHash/s
GeForce 840M
94.68 mHash/s

Face detection Data courtesy CompuBench

GeForce GT 640M Mac
6.58 mPixels/s
GeForce 840M
22.54 mPixels/s

Ocean surface simulation Data courtesy CompuBench

GeForce GT 640M Mac
226.22 frames/s
GeForce 840M
159.36 frames/s

Particle simulation Data courtesy CompuBench

GeForce GT 640M Mac
69.88 mInteraction/s
GeForce 840M
184.99 mInteraction/s

T-Rex (Compubench 1.5) Data courtesy CompuBench

GeForce GT 640M Mac
0.56 frames/s
GeForce 840M
1.23 frames/s

Video composition Data courtesy CompuBench

GeForce GT 640M Mac
11.95 frames/s
GeForce 840M
21.01 frames/s

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce GT 640M Mac
3,356.32
GeForce 840M
3,359.62

Manhattan (GFXBench 3.0) Data courtesy CompuBench

GeForce GT 640M Mac
2,290.86
GeForce 840M
3,715.08

Specifications Full list of technical specs

gpu

GPU brand Nvidia
GPU name GK107
Market Laptop
Clock speed 745 MHz
Is dual GPU No
Reference card None

raw performance

Shading units 384
Texture mapping units 32
Render output processors 8
Pixel rate 5.96 GPixel/s
Texture rate 23.84 GTexel/s
Floating-point performance 572.2 GFLOPS

memory

Memory clock speed 1,250 MHz
Effective memory clock speed 5,000 MHz
Memory bus 64 bit
Memory 512 MB
Memory type GDDR5
Memory bandwidth 40 GB/s

noise and power

TDP 32W
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