AMD Radeon HD 6990 vs AMD Radeon RX 640 Mobile
GPU Specs Compare
Graphics Card
Release Date
Mar 2011
May 2019
Generation
Northern Islands
Mobility Radeon
Type
Desktop
Mobile
Bus Interface
PCIe 2.0 x16
PCIe 3.0 x8
Clock Speeds
Memory Clock
1250 MHz
1500 MHz
Base Clock
-
1082 MHz
Boost Clock
-
1218 MHz
Memory
Memory Size
2GB
2GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
64bit
Bandwidth
160.0GB/s
48.00GB/s
Render Config
Compute Units
24
10
Shading Units
1536
640
TMUs
96
40
ROPs
32
16
L1 Cache
8 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
512 KB
Theoretical Performance
Pixel Rate
26.56 GPixel/s
19.49 GPixel/s
Texture Rate
79.68 GTexel/s
48.72 GTexel/s
FP32 (float)
2.550 TFLOPS
1.559 TFLOPS
FP64 (double)
637.4 GFLOPS
97.44 GFLOPS
FP16 (half)
-
1.559 TFLOPS
Graphics Processor
GPU Name
Antilles
Polaris 23
GPU Variant
Antilles XT(215-0807027)
Polaris 23 XT
Architecture
TeraScale 3
GCN 4.0
Foundry
TSMC
GlobalFoundries
Process Size
40 nm
14 nm
Transistors
2.64 billion
2.2 billion
Die Size
389 mm²
103 mm²
Board Design
TDP
375W
50W
Suggested PSU
750 W
-
Outputs
1x DVI4x mini-DisplayPort 1.2
No outputs
Power Connectors
2x 8-pin
None
Graphics Features
DirectX
11.2 (11_0)
12 (12_0)
OpenGL
4.4
4.6
OpenCL
1.2
2.1
Vulkan
N/A
1.2
Shader Model
5.0
6.4