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GPU Comparison
NVIDIA GeForce GT 640 Rev. 2 vs NVIDIA GeForce GTX 660
NVIDIA GeForce GT 640 Rev. 2 vs NVIDIA GeForce GTX 660
VS
NVIDIA GeForce GT 640 Rev. 2
NVIDIA GeForce GTX 660
We compared two Desktop platform GPUs: 1024MB VRAM GeForce GT 640 Rev. 2 and 2GB VRAM GeForce GTX 660 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
NVIDIA GeForce GT 640 Rev. 2 's Advantages
Released 8 months late
Lower TDP (49W vs 140W)
NVIDIA GeForce GTX 660 's Advantages
Boost Clock1032MHz
More VRAM (2GB vs 1GB)
Larger VRAM bandwidth (144.2GB/s vs 40.06GB/s)
576 additional rendering cores
Score
Benchmark
FP32 (float)
GeForce GT 640 Rev. 2
0.803 TFLOPS
GeForce GTX 660
+146%
1.981 TFLOPS
GeForce GT 640 Rev. 2
VS
GeForce GTX 660
Graphics Card
May 2013
Release Date
Sep 2012
GeForce 600
Generation
GeForce 600
Desktop
Type
Desktop
PCIe 2.0 x8
Bus Interface
PCIe 3.0 x16
Clock Speeds
-
Base Clock
980 MHz
-
Boost Clock
1032 MHz
1252 MHz
Memory Clock
1502 MHz
Memory
1024MB
Memory Size
2GB
GDDR5
Memory Type
GDDR5
64bit
Memory Bus
192bit
40.06GB/s
Bandwidth
144.2GB/s
Render Config
-
SM Count
-
-
Compute Units
-
384
Shading Units
960
32
TMUs
80
8
ROPs
24
-
Tensor Cores
-
-
RT Cores
-
16 KB (per SMX)
L1 Cache
16 KB (per SMX)
512 KB
L2 Cache
384 KB
Theoretical Performance
8.368 GPixel/s
Pixel Rate
20.64 GPixel/s
33.47 GTexel/s
Texture Rate
82.56 GTexel/s
-
FP16 (half)
-
803.3 GFLOPS
FP32 (float)
1.981 TFLOPS
33.47 GFLOPS
FP64 (double)
82.56 GFLOPS
Graphics Processor
GK208
GPU Name
GK106
GK208-400-A1
GPU Variant
GK106-400-A1
Kepler 2.0
Architecture
Kepler
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
1.02 billion
Transistors
2.54 billion
87 mm²
Die Size
221 mm²
Board Design
49W
TDP
140W
200 W
Suggested PSU
300 W
1x DVI 1x HDMI 1.4a 1x VGA
Outputs
2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2
None
Power Connectors
1x 6-pin
Graphics Features
12 (11_0)
DirectX
12 (11_0)
4.6
OpenGL
4.6
3.0
OpenCL
3.0
1.1
Vulkan
1.1
3.5
CUDA
3.0
5.1
Shader Model
5.1
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2
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3
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4
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5
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6
NVIDIA GeForce GT 640 Rev. 2 vs NVIDIA GeForce 8400 GS PCI
7
NVIDIA GeForce 9400 GT Rev. 3 vs NVIDIA GeForce GT 640 Rev. 2
8
NVIDIA GeForce GT 640 Rev. 2 vs AMD FirePro W7100
9
NVIDIA GeForce GT 640 Rev. 2 vs AMD FireStream 9370
10
NVIDIA GeForce GT 640 Rev. 2 vs Intel Arc A350
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