AMD Radeon R9 285 vs AMD Radeon HD 7990
GPU Specs Compare
Graphics Card
Release Date
Sep 2014
Apr 2013
Generation
Volcanic Islands
Southern Islands
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 3.0 x16
Clock Speeds
Memory Clock
1375 MHz
1500 MHz
Base Clock
-
950 MHz
Boost Clock
-
1000 MHz
Memory
Memory Size
2GB
3GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
384bit
Bandwidth
176.0GB/s
288.0GB/s
Render Config
Compute Units
28
32
Shading Units
1792
2048
TMUs
112
128
ROPs
32
32
L1 Cache
16 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
768 KB
Theoretical Performance
Pixel Rate
29.38 GPixel/s
32.00 GPixel/s
Texture Rate
102.8 GTexel/s
128.0 GTexel/s
FP16 (half)
3.290 TFLOPS
-
FP32 (float)
3.290 TFLOPS
4.096 TFLOPS
FP64 (double)
205.6 GFLOPS
1024 GFLOPS
Graphics Processor
GPU Name
Tonga
Malta
GPU Variant
Tonga PRO(215-0851128)
Malta XT(215-0849026)
Architecture
GCN 3.0
GCN 1.0
Foundry
TSMC
TSMC
Process Size
28 nm
28 nm
Transistors
5 billion
4.313 billion
Die Size
366 mm²
365 mm²
Board Design
TDP
190W
375W
Suggested PSU
450 W
750 W
Outputs
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
1x DVI4x mini-DisplayPort 1.2
Power Connectors
2x 6-pin
2x 8-pin
Graphics Features
DirectX
12 (12_0)
12 (11_1)
OpenGL
4.6
4.6
OpenCL
2.1
1.2
Vulkan
1.2.170
1.2
Shader Model
6.5
5.1