AMD Radeon HD 7870 XT vs AMD Radeon RX 640 Mobile
GPU · Specs Compare
Graphics Card
Release Date
Nov 2012
May 2019
Generation
Southern Islands
Mobility Radeon
Type
Desktop
Mobile
Bus Interface
PCIe 3.0 x16
PCIe 3.0 x8
Clock Speeds
Base Clock
925 MHz
1082 MHz
Boost Clock
975 MHz
1218 MHz
Memory Clock
1500 MHz
1500 MHz
Memory
Memory Size
2GB
2GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
64bit
Bandwidth
192.0GB/s
48.00GB/s
Render Config
Compute Units
24
10
Shading Units
1536
640
TMUs
96
40
ROPs
32
16
L1 Cache
16 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
512 KB
Theoretical Performance
Pixel Rate
31.20 GPixel/s
19.49 GPixel/s
Texture Rate
93.60 GTexel/s
48.72 GTexel/s
FP32 (float)
2.995 TFLOPS
1.559 TFLOPS
FP64 (double)
748.8 GFLOPS
97.44 GFLOPS
FP16 (half)
—
1.559 TFLOPS
Graphics Processor
GPU Name
Tahiti
Polaris 23
GPU Variant
Tahiti LE(215-0821122)
Polaris 23 XT
Architecture
GCN 1.0
GCN 4.0
Foundry
TSMC
GlobalFoundries
Process Size
28 nm
14 nm
Transistors
4.313 billion
2.2 billion
Die Size
352 mm²
103 mm²
Board Design
TDP
185W
50W
Suggested PSU
450 W
—
Outputs
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
No outputs
Power Connectors
2x 6-pin
None
Graphics Features
DirectX
12 (11_1)
12 (12_0)
OpenGL
4.6
4.6
OpenCL
1.2
2.1
Vulkan
1.2
1.2
Shader Model
5.1
6.4
▲ Specs Compare
Data sourced from official specifications and benchmark tests.