NVIDIA RTX A400 vs NVIDIA GeForce GT 640
We compared two Desktop platform GPUs: 4GB VRAM RTX A400 and 2GB VRAM GeForce GT 640 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
NVIDIA RTX A400 's Advantages
Released 11 years and 10 months late
Boost Clock1762MHz
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (96.00GB/s vs 28.51GB/s)
384 additional rendering cores
Lower TDP (50W vs 65W)
Score
Benchmark
FP32 (float)
RTX A400
+290%
2.706 TFLOPS
GeForce GT 640
0.693 TFLOPS
3DMark Time Spy
RTX A400
+411%
2091
GeForce GT 640
409
Graphics Card
Apr 2024
Release Date
Jun 2012
Quadro Ampere(Ax000)
Generation
GeForce 600
Desktop
Type
Desktop
PCIe 4.0 x8
Bus Interface
PCIe 3.0 x16
Clock Speeds
1417 MHz
Base Clock
-
1762 MHz
Boost Clock
-
1500 MHz
Memory Clock
891 MHz
Memory
4GB
Memory Size
2GB
GDDR6
Memory Type
DDR3
64bit
Memory Bus
128bit
96.00GB/s
Bandwidth
28.51GB/s
Render Config
-
-
-
6
SM Count
-
768
Shading Units
384
24
TMUs
32
16
ROPs
16
24
Tensor Cores
-
6
RT Cores
-
128 KB (per SM)
L1 Cache
16 KB (per SMX)
2 MB
L2 Cache
256 KB
-
-
-
Theoretical Performance
28.19 GPixel/s
Pixel Rate
7.216 GPixel/s
42.29 GTexel/s
Texture Rate
28.86 GTexel/s
2.706 TFLOPS
FP16 (half)
-
2.706 TFLOPS
FP32 (float)
692.7 GFLOPS
42.29 GFLOPS
FP64 (double)
28.86 GFLOPS
Board Design
50W
TDP
65W
250 W
Suggested PSU
250 W
4x mini-DisplayPort 1.4a
Outputs
1x DVI
1x HDMI 1.4a
1x DisplayPort 1.2
None
Power Connectors
None
Graphics Processor
GA107
GPU Name
GK107
-
GPU Variant
GK107-300-A2
Ampere
Architecture
Kepler
Samsung
Foundry
TSMC
8 nm
Process Size
28 nm
8.7 billion
Transistors
1.27 billion
200 mm²
Die Size
118 mm²
Graphics Features
12 Ultimate (12_2)
DirectX
12 (11_0)
4.6
OpenGL
4.6
3.0
OpenCL
3.0
1.3
Vulkan
1.1
8.6
CUDA
3.0
6.8
Shader Model
5.1
