AMD Radeon HD 7990 vs AMD Radeon R9 390 X2
GPU · Specs Compare
Graphics Card
Release Date
Apr 2013
Sep 2015
Generation
Southern Islands
Pirate Islands
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 3.0 x16
Clock Speeds
Base Clock
950 MHz
—
Boost Clock
1000 MHz
—
Memory Clock
1500 MHz
1350 MHz
Memory
Memory Size
3GB
8GB
Memory Type
GDDR5
GDDR5
Memory Bus
384bit
512bit
Bandwidth
288.0GB/s
345.6GB/s
Render Config
Compute Units
32
40
Shading Units
2048
2560
TMUs
128
160
ROPs
32
64
L1 Cache
16 KB (per CU)
16 KB (per CU)
L2 Cache
768 KB
1024 KB
Theoretical Performance
Pixel Rate
32.00 GPixel/s
64.00 GPixel/s
Texture Rate
128.0 GTexel/s
160.0 GTexel/s
FP32 (float)
4.096 TFLOPS
5.120 TFLOPS
FP64 (double)
1024 GFLOPS
640.0 GFLOPS
Graphics Processor
GPU Name
Malta
Grenada
GPU Variant
Malta XT(215-0849026)
Grenada PRO(215-0880030)
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
365 mm²
438 mm²
Board Design
TDP
375W
580W
Suggested PSU
750 W
950 W
Outputs
1x DVI4x mini-DisplayPort 1.2
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
Power Connectors
2x 8-pin
4x 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
▲ Specs Compare
Data sourced from official specifications and benchmark tests.