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GPU Comparison
AMD Radeon R9 390 vs AMD Radeon HD 8870 OEM
AMD Radeon R9 390 vs AMD Radeon HD 8870 OEM
VS
AMD Radeon R9 390
AMD Radeon HD 8870 OEM
We compared two Desktop platform GPUs: 8GB VRAM Radeon R9 390 and 2GB VRAM Radeon HD 8870 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
AMD Radeon R9 390 's Advantages
Released 2 years and 5 months late
More VRAM (8GB vs 2GB)
Larger VRAM bandwidth (384.0GB/s vs 153.6GB/s)
1280 additional rendering cores
AMD Radeon HD 8870 OEM 's Advantages
Lower TDP (175W vs 275W)
Score
Benchmark
FP32 (float)
Radeon R9 390
+100%
5.12 TFLOPS
Radeon HD 8870 OEM
2.56 TFLOPS
Radeon R9 390
VS
Radeon HD 8870 OEM
Graphics Card
Jun 2015
Release Date
Jan 2013
Pirate Islands
Generation
Sea Islands
Desktop
Type
Desktop
PCIe 3.0 x16
Bus Interface
PCIe 3.0 x16
Clock Speeds
-
Base Clock
-
-
Boost Clock
-
1500 MHz
Memory Clock
1200 MHz
Memory
8GB
Memory Size
2GB
GDDR5
Memory Type
GDDR5
512bit
Memory Bus
256bit
384.0GB/s
Bandwidth
153.6GB/s
Render Config
-
SM Count
-
40
Compute Units
20
2560
Shading Units
1280
160
TMUs
80
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
32.00 GPixel/s
160.0 GTexel/s
Texture Rate
80.00 GTexel/s
-
FP16 (half)
-
5.120 TFLOPS
FP32 (float)
2.560 TFLOPS
640.0 GFLOPS
FP64 (double)
160.0 GFLOPS
Graphics Processor
Grenada
GPU Name
Pitcairn
Grenada PRO (215-0880030)
GPU Variant
Pitcairn XT (215-0828047)
GCN 2.0
Architecture
GCN 1.0
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
6.2 billion
Transistors
2.8 billion
438 mm²
Die Size
212 mm²
Board Design
275W
TDP
175W
600 W
Suggested PSU
450 W
2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2
Outputs
1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2
1x 6-pin + 1x 8-pin
Power Connectors
2x 6-pin
Graphics Features
12 (12_0)
DirectX
12 (11_1)
4.6
OpenGL
4.6
2.0
OpenCL
1.2
1.2
Vulkan
1.2
-
CUDA
-
6.3
Shader Model
5.1
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