AMD Radeon HD 6990 vs AMD Radeon R9 M385X
GPU · Specs Compare
Graphics Card
Release Date
Mar 2011
May 2015
Generation
Northern Islands
Gem System
Type
Desktop
Mobile
Bus Interface
PCIe 2.0 x16
PCIe 3.0 x16
Clock Speeds
Memory Clock
1250 MHz
1200 MHz
Base Clock
—
1000 MHz
Boost Clock
—
1100 MHz
Memory
Memory Size
2GB
4GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
128bit
Bandwidth
160.0GB/s
76.80GB/s
Render Config
Compute Units
24
14
Shading Units
1536
896
TMUs
96
56
ROPs
32
16
L1 Cache
8 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
256 KB
Theoretical Performance
Pixel Rate
26.56 GPixel/s
17.60 GPixel/s
Texture Rate
79.68 GTexel/s
61.60 GTexel/s
FP32 (float)
2.550 TFLOPS
1.971 TFLOPS
FP64 (double)
637.4 GFLOPS
123.2 GFLOPS
Graphics Processor
GPU Name
Antilles
Strato
GPU Variant
Antilles XT(215-0807027)
Strato XT
Architecture
TeraScale 3
GCN 2.0
Foundry
TSMC
TSMC
Process Size
40 nm
28 nm
Transistors
2.64 billion
2.08 billion
Die Size
389 mm²
160 mm²
Board Design
TDP
375W
Unknown
Suggested PSU
750 W
—
Outputs
1x DVI4x mini-DisplayPort 1.2
Portable Device Dependent
Power Connectors
2x 8-pin
—
Graphics Features
DirectX
11.2 (11_0)
12 (12_0)
OpenGL
4.4
4.6
OpenCL
1.2
2.1
Vulkan
N/A
1.2.170
Shader Model
5.0
6.5
▲ Specs Compare
Data sourced from official specifications and benchmark tests.