AMD Radeon R9 390X vs AMD Radeon HD 8770 OEM
GPU · Specs Compare
Graphics Card
Release Date
Jun 2015
Sep 2013
Generation
Pirate Islands
Sea Islands
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 3.0 x16
Clock Speeds
Memory Clock
1500 MHz
1500 MHz
Memory
Memory Size
8GB
1024MB
Memory Type
GDDR5
GDDR5
Memory Bus
512bit
128bit
Bandwidth
384.0GB/s
96.00GB/s
Render Config
Compute Units
44
14
Shading Units
2816
896
TMUs
176
56
ROPs
64
16
L1 Cache
16 KB (per CU)
16 KB (per CU)
L2 Cache
1024 KB
256 KB
Theoretical Performance
Pixel Rate
67.20 GPixel/s
16.80 GPixel/s
Texture Rate
184.8 GTexel/s
58.80 GTexel/s
FP32 (float)
5.914 TFLOPS
1.882 TFLOPS
FP64 (double)
739.2 GFLOPS
117.6 GFLOPS
Graphics Processor
GPU Name
Grenada
Bonaire
GPU Variant
Grenada XT(215-0880004)
Bonaire XT(215-0839039)
Architecture
GCN 2.0
GCN 2.0
Foundry
TSMC
TSMC
Process Size
28 nm
28 nm
Transistors
6.2 billion
2.08 billion
Die Size
438 mm²
160 mm²
Board Design
TDP
275W
85W
Suggested PSU
600 W
250 W
Outputs
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
Power Connectors
1x 6-pin + 1x 8-pin
1x 6-pin
Graphics Features
DirectX
12 (12_0)
12 (12_0)
OpenGL
4.6
4.6
OpenCL
2.0
2.0
Vulkan
1.2
1.2
Shader Model
6.3
6.3
▲ Specs Compare
Data sourced from official specifications and benchmark tests.