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GPU Comparison
AMD Radeon R9 390 vs AMD Radeon R9 285
AMD Radeon R9 390 vs AMD Radeon R9 285
VS
AMD Radeon R9 390
AMD Radeon R9 285
We compared two Desktop platform GPUs: 8GB VRAM Radeon R9 390 and 2GB VRAM Radeon R9 285 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
AMD Radeon R9 390 's Advantages
Released 9 months late
More VRAM (8GB vs 2GB)
Larger VRAM bandwidth (384.0GB/s vs 176.0GB/s)
768 additional rendering cores
AMD Radeon R9 285 's Advantages
Lower TDP (190W vs 275W)
Score
Benchmark
FP32 (float)
Radeon R9 390
+55%
5.12 TFLOPS
Radeon R9 285
3.29 TFLOPS
Radeon R9 390
VS
Radeon R9 285
Graphics Card
Jun 2015
Release Date
Sep 2014
Pirate Islands
Generation
Volcanic Islands
Desktop
Type
Desktop
PCIe 3.0 x16
Bus Interface
PCIe 3.0 x16
Clock Speeds
-
Base Clock
-
-
Boost Clock
-
1500 MHz
Memory Clock
1375 MHz
Memory
8GB
Memory Size
2GB
GDDR5
Memory Type
GDDR5
512bit
Memory Bus
256bit
384.0GB/s
Bandwidth
176.0GB/s
Render Config
-
SM Count
-
40
Compute Units
28
2560
Shading Units
1792
160
TMUs
112
64
ROPs
32
-
Tensor Cores
-
-
RT Cores
-
16 KB (per CU)
L1 Cache
16 KB (per CU)
1024 KB
L2 Cache
512 KB
Theoretical Performance
64.00 GPixel/s
Pixel Rate
29.38 GPixel/s
160.0 GTexel/s
Texture Rate
102.8 GTexel/s
-
FP16 (half)
3.290 TFLOPS
5.120 TFLOPS
FP32 (float)
3.290 TFLOPS
640.0 GFLOPS
FP64 (double)
205.6 GFLOPS
Graphics Processor
Grenada
GPU Name
Tonga
Grenada PRO (215-0880030)
GPU Variant
Tonga PRO (215-0851128)
GCN 2.0
Architecture
GCN 3.0
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
6.2 billion
Transistors
5 billion
438 mm²
Die Size
366 mm²
Board Design
275W
TDP
190W
600 W
Suggested PSU
450 W
2x DVI 1x 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 Features
12 (12_0)
DirectX
12 (12_0)
4.6
OpenGL
4.6
2.0
OpenCL
2.1
1.2
Vulkan
1.2.170
-
CUDA
-
6.3
Shader Model
6.5
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