AMD Radeon HD 7870 XT vs AMD Radeon R9 390X
GPU Specs Compare
Graphics Card
Release Date
Nov 2012
Jun 2015
Generation
Southern Islands
Pirate Islands
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 3.0 x16
Clock Speeds
Base Clock
925 MHz
-
Boost Clock
975 MHz
-
Memory Clock
1500 MHz
1500 MHz
Memory
Memory Size
2GB
8GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
512bit
Bandwidth
192.0GB/s
384.0GB/s
Render Config
Compute Units
24
44
Shading Units
1536
2816
TMUs
96
176
ROPs
32
64
L1 Cache
16 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
1024 KB
Theoretical Performance
Pixel Rate
31.20 GPixel/s
67.20 GPixel/s
Texture Rate
93.60 GTexel/s
184.8 GTexel/s
FP32 (float)
2.995 TFLOPS
5.914 TFLOPS
FP64 (double)
748.8 GFLOPS
739.2 GFLOPS
Graphics Processor
GPU Name
Tahiti
Grenada
GPU Variant
Tahiti LE(215-0821122)
Grenada XT(215-0880004)
Architecture
GCN 1.0
GCN 2.0
Foundry
TSMC
TSMC
Process Size
28 nm
28 nm
Transistors
4.313 billion
6.2 billion
Die Size
352 mm²
438 mm²
Board Design
TDP
185W
275W
Suggested PSU
450 W
600 W
Outputs
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
Power Connectors
2x 6-pin
1x 6-pin + 1x 8-pin
Graphics Features
DirectX
12 (11_1)
12 (12_0)
OpenGL
4.6
4.6
OpenCL
1.2
2.0
Vulkan
1.2
1.2
Shader Model
5.1
6.3