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GPU Comparison
AMD Radeon HD 7870 XT vs AMD Radeon R9 390
AMD Radeon HD 7870 XT vs AMD Radeon R9 390
VS
AMD Radeon HD 7870 XT
AMD Radeon R9 390
We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 7870 XT and 8GB VRAM Radeon R9 390 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
AMD Radeon HD 7870 XT 's Advantages
Boost Clock975MHz
Lower TDP (185W vs 275W)
AMD Radeon R9 390 's Advantages
Released 2 years and 7 months late
More VRAM (8GB vs 2GB)
Larger VRAM bandwidth (384.0GB/s vs 192.0GB/s)
1024 additional rendering cores
Score
Benchmark
FP32 (float)
Radeon HD 7870 XT
2.995 TFLOPS
Radeon R9 390
+70%
5.12 TFLOPS
Radeon HD 7870 XT
VS
Radeon R9 390
Graphics Card
Nov 2012
Release Date
Jun 2015
Southern Islands
Generation
Pirate Islands
Desktop
Type
Desktop
PCIe 3.0 x16
Bus Interface
PCIe 3.0 x16
Clock Speeds
925 MHz
Base Clock
-
975 MHz
Boost Clock
-
1500 MHz
Memory Clock
1500 MHz
Memory
2GB
Memory Size
8GB
GDDR5
Memory Type
GDDR5
256bit
Memory Bus
512bit
192.0GB/s
Bandwidth
384.0GB/s
Render Config
-
SM Count
-
24
Compute Units
40
1536
Shading Units
2560
96
TMUs
160
32
ROPs
64
-
Tensor Cores
-
-
RT Cores
-
16 KB (per CU)
L1 Cache
16 KB (per CU)
512 KB
L2 Cache
1024 KB
Theoretical Performance
31.20 GPixel/s
Pixel Rate
64.00 GPixel/s
93.60 GTexel/s
Texture Rate
160.0 GTexel/s
-
FP16 (half)
-
2.995 TFLOPS
FP32 (float)
5.120 TFLOPS
748.8 GFLOPS
FP64 (double)
640.0 GFLOPS
Graphics Processor
Tahiti
GPU Name
Grenada
Tahiti LE (215-0821122)
GPU Variant
Grenada PRO (215-0880030)
GCN 1.0
Architecture
GCN 2.0
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
4.313 billion
Transistors
6.2 billion
352 mm²
Die Size
438 mm²
Board Design
185W
TDP
275W
450 W
Suggested PSU
600 W
1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2
Outputs
2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2
2x 6-pin
Power Connectors
1x 6-pin + 1x 8-pin
Graphics Features
12 (11_1)
DirectX
12 (12_0)
4.6
OpenGL
4.6
1.2
OpenCL
2.0
1.2
Vulkan
1.2
-
CUDA
-
5.1
Shader Model
6.3
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