Radeon R9 280 vs Radeon R9 285
We compared two Desktop platform GPUs: 3GB VRAM Radeon R9 280 and 2GB VRAM Radeon R9 285 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
Radeon R9 280 's Advantages
Boost Clock933MHz
More VRAM (3GB vs 2GB)
Larger VRAM bandwidth (240.0GB/s vs 176.0GB/s)
Radeon R9 285 's Advantages
Released 6 months late
Lower TDP (190W vs 200W)
Score
Benchmark
FP32 (float)
Radeon R9 280
+1%
3344
Radeon R9 285
3290
Graphics Card
Mar 2014
Release Date
Sep 2014
Volcanic Islands
Generation
Volcanic Islands
Desktop
Type
Desktop
PCIe 3.0 x16
Bus Interface
PCIe 3.0 x16
Clock Speeds
827 MHz
Base Clock
-
933 MHz
Boost Clock
-
1250 MHz
Memory Clock
1375 MHz
Memory
3GB
Memory Size
2GB
GDDR5
Memory Type
GDDR5
384bit
Memory Bus
256bit
240.0GB/s
Bandwidth
176.0GB/s
Render Config
28
Compute Units
28
1792
Shading Units
1792
112
TMUs
112
32
ROPs
32
16 KB (per CU)
L1 Cache
16 KB (per CU)
768 KB
L2 Cache
512 KB
Theoretical Performance
29.86 GPixel/s
Pixel Rate
29.38 GPixel/s
104.5 GTexel/s
Texture Rate
102.8 GTexel/s
-
FP16 (half)
3.290 TFLOPS
3.344 TFLOPS
FP32 (float)
3.290 TFLOPS
836.0 GFLOPS
FP64 (double)
205.6 GFLOPS
Board Design
200W
TDP
190W
550 W
Suggested PSU
450 W
1x DVI
2x HDMI 1.4a
1x DisplayPort 1.2
Outputs
2x DVI
1x HDMI 1.4a
1x DisplayPort 1.2
1x 6-pin + 1x 8-pin
Power Connectors
2x 6-pin
Graphics Processor
Tahiti
GPU Name
Tonga
Tahiti PRO3
(215-0821330)
GPU Variant
Tonga PRO
(215-0851128)
GCN 1.0
Architecture
GCN 3.0
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
4.313 billion
Transistors
5 billion
352 mm²
Die Size
366 mm²
Graphics Features
12 (11_1)
DirectX
12 (12_0)
4.6
OpenGL
4.6
1.2
OpenCL
2.1
1.2
Vulkan
1.2.170
5.1
Shader Model
6.5
