AMD Radeon HD 6950 vs AMD Radeon R9 390 X2
GPU Specs Compare
Graphics Card
Release Date
Dec 2010
Sep 2015
Generation
Northern Islands
Pirate Islands
Type
Desktop
Desktop
Bus Interface
PCIe 2.0 x16
PCIe 3.0 x16
Clock Speeds
Memory Clock
1250 MHz
1350 MHz
Memory
Memory Size
2GB
8GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
512bit
Bandwidth
160.0GB/s
345.6GB/s
Render Config
Compute Units
22
40
Shading Units
1408
2560
TMUs
88
160
ROPs
32
64
L1 Cache
8 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
1024 KB
Theoretical Performance
Pixel Rate
25.60 GPixel/s
64.00 GPixel/s
Texture Rate
70.40 GTexel/s
160.0 GTexel/s
FP32 (float)
2.253 TFLOPS
5.120 TFLOPS
FP64 (double)
563.2 GFLOPS
640.0 GFLOPS
Graphics Processor
GPU Name
Cayman
Grenada
GPU Variant
Cayman PRO(215-0807019)
Grenada PRO(215-0880030)
Architecture
TeraScale 3
GCN 2.0
Foundry
TSMC
TSMC
Process Size
40 nm
28 nm
Transistors
2.64 billion
6.2 billion
Die Size
389 mm²
438 mm²
Board Design
TDP
200W
580W
Suggested PSU
550 W
950 W
Outputs
2x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
Power Connectors
2x 6-pin
4x 8-pin
Graphics Features
DirectX
11.2 (11_0)
12 (12_0)
OpenGL
4.4
4.6
OpenCL
1.2
2.0
Vulkan
N/A
1.2
Shader Model
5.0
6.3