NVIDIA GeForce GT 640M Mac Edition vs AMD Radeon R5 A255
We compared two Mobile platform GPUs: 512MB VRAM GeForce GT 640M Mac Edition and 1024MB VRAM Radeon R5 A255 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
AMD Radeon R5 A255 's Advantages
Released 11 months late
Boost Clock940MHz
More VRAM (1024GB vs 512GB)
Larger VRAM bandwidth (64.00GB/s vs 40.00GB/s)
Score
Benchmark
FP32 (float)
GeForce GT 640M Mac Edition
0.572 TFLOPS
Radeon R5 A255
+26%
0.721 TFLOPS
Graphics Card
Feb 2013
Release Date
Jan 2014
GeForce 600M
Generation
All-In-One
Mobile
Type
Mobile
PCIe 3.0 x16
Bus Interface
PCIe 3.0 x8
Clock Speeds
-
Base Clock
925 MHz
-
Boost Clock
940 MHz
1250 MHz
Memory Clock
1000 MHz
Memory
512MB
Memory Size
1024MB
GDDR5
Memory Type
GDDR5
64bit
Memory Bus
128bit
40.00GB/s
Bandwidth
64.00GB/s
Render Config
-
Compute Units
6
-
-
-
384
Shading Units
384
32
TMUs
24
8
ROPs
8
-
-
-
-
-
-
16 KB (per SMX)
L1 Cache
16 KB (per CU)
128 KB
L2 Cache
256 KB
-
-
-
Theoretical Performance
5.960 GPixel/s
Pixel Rate
7.520 GPixel/s
23.84 GTexel/s
Texture Rate
22.56 GTexel/s
-
-
-
572.2 GFLOPS
FP32 (float)
721.9 GFLOPS
23.84 GFLOPS
FP64 (double)
-
Board Design
32W
TDP
Unknown
-
-
-
No outputs
Outputs
Portable Device Dependent
-
-
-
Graphics Processor
GK107
GPU Name
Topaz
N13P-GS
GPU Variant
Topaz PRO
(216-0858030)
Kepler
Architecture
GCN 3.0
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
1.27 billion
Transistors
1.55 billion
118 mm²
Die Size
125 mm²
Graphics Features
12 (11_0)
DirectX
12 (12_0)
4.6
OpenGL
4.6
3.0
OpenCL
2.1
1.1
Vulkan
1.2.170
3.0
CUDA
-
5.1
Shader Model
6.5
