Home GPU Comparison NVIDIA GeForce GT 640 vs NVIDIA GeForce GTX 645 OEM

NVIDIA GeForce GT 640 vs NVIDIA GeForce GTX 645 OEM

We compared two Desktop platform GPUs: 2GB VRAM GeForce GT 640 and 1024MB VRAM GeForce GTX 645 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 640 's Advantages
More VRAM (2GB vs 1024GB)
NVIDIA GeForce GTX 645 OEM 's Advantages
Released 10 months late
Larger VRAM bandwidth (64.00GB/s vs 28.51GB/s)
192 additional rendering cores

Score

Benchmark

FP32 (float)
GeForce GT 640
0.693 TFLOPS
GeForce GTX 645 OEM +36%
0.949 TFLOPS
VS

Graphics Card

Jun 2012
Release Date
Apr 2013
GeForce 600
Generation
GeForce 600
Desktop
Type
Desktop
PCIe 3.0 x16
Bus Interface
PCIe 3.0 x16

Clock Speeds

-
-
-
-
-
-
891 MHz
Memory Clock
1000 MHz

Memory

2GB
Memory Size
1024MB
DDR3
Memory Type
GDDR5
128bit
Memory Bus
128bit
28.51GB/s
Bandwidth
64.00GB/s

Render Config

-
-
-
-
-
-
384
Shading Units
576
32
TMUs
48
16
ROPs
16
-
-
-
-
-
-
16 KB (per SMX)
L1 Cache
16 KB (per SMX)
256 KB
L2 Cache
256 KB
-
-
-

Theoretical Performance

7.216 GPixel/s
Pixel Rate
9.888 GPixel/s
28.86 GTexel/s
Texture Rate
39.55 GTexel/s
-
-
-
692.7 GFLOPS
FP32 (float)
949.2 GFLOPS
28.86 GFLOPS
FP64 (double)
39.55 GFLOPS

Board Design

65W
TDP
65W
250 W
Suggested PSU
250 W
1x DVI 1x HDMI 1.4a 1x DisplayPort 1.2
Outputs
1x DVI 1x HDMI 1.4a 1x DisplayPort 1.2
None
Power Connectors
None

Graphics Processor

GK107
GPU Name
GK106
GK107-300-A2
GPU Variant
GK106-200-A1
Kepler
Architecture
Kepler
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
1.27 billion
Transistors
2.54 billion
118 mm²
Die Size
221 mm²

Graphics Features

12 (11_0)
DirectX
12 (11_0)
4.6
OpenGL
4.6
3.0
OpenCL
3.0
1.1
Vulkan
1.1
3.0
CUDA
3.0
5.1
Shader Model
5.1

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