AMD Radeon RX 6600M vs AMD Radeon R9 390
GPU · Specs Compare
Graphics Card
Release Date
May 2021
Jun 2015
Generation
Mobility Radeon
Pirate Islands
Type
Mobile
Desktop
Bus Interface
PCIe 4.0 x8
PCIe 3.0 x16
Clock Speeds
Base Clock
2068 MHz
—
Boost Clock
2416 MHz
—
Memory Clock
1750 MHz
1500 MHz
Memory
Memory Size
8GB
8GB
Memory Type
GDDR6
GDDR5
Memory Bus
128bit
512bit
Bandwidth
224.0GB/s
384.0GB/s
Render Config
Compute Units
28
40
Shading Units
1792
2560
TMUs
112
160
ROPs
64
64
RT Cores
28
—
L1 Cache
128 KB per Array
16 KB (per CU)
L2 Cache
2 MB
1024 KB
L3 Cache
32 MB
—
Theoretical Performance
Pixel Rate
154.6 GPixel/s
64.00 GPixel/s
Texture Rate
270.6 GTexel/s
160.0 GTexel/s
FP16 (half)
17.32 TFLOPS
—
FP32 (float)
8.659 TFLOPS
5.120 TFLOPS
FP64 (double)
541.2 GFLOPS
640.0 GFLOPS
Graphics Processor
GPU Name
Navi 23
Grenada
Architecture
RDNA 2.0
GCN 2.0
Foundry
TSMC
TSMC
Process Size
7 nm
28 nm
Transistors
11.06 billion
6.2 billion
Die Size
237 mm²
438 mm²
GPU Variant
—
Grenada PRO(215-0880030)
Board Design
TDP
100W
275W
Outputs
No outputs
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
Power Connectors
None
1x 6-pin + 1x 8-pin
Suggested PSU
—
600 W
Graphics Features
DirectX
12 Ultimate (12_2)
12 (12_0)
OpenGL
4.6
4.6
OpenCL
2.1
2.0
Vulkan
1.3
1.2
Shader Model
6.5
6.3
Benchmark
3DMark Time Spy
—
3,964
3DMark Time Spy Extreme
—
1,931
▲ Specs Compare
Data sourced from official specifications and benchmark tests.