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