AMD Radeon RX 6800 vs AMD Radeon R9 390X
GPU · Specs Compare
Graphics Card
Release Date
Oct 2020
Jun 2015
Generation
Navi II
Pirate Islands
Type
Desktop
Desktop
Bus Interface
PCIe 4.0 x16
PCIe 3.0 x16
Clock Speeds
Base Clock
1700 MHz
—
Boost Clock
2105 MHz
—
Memory Clock
2000 MHz
1500 MHz
Memory
Memory Size
16GB
8GB
Memory Type
GDDR6
GDDR5
Memory Bus
256bit
512bit
Bandwidth
512.0GB/s
384.0GB/s
Render Config
Compute Units
60
44
Shading Units
3840
2816
TMUs
240
176
ROPs
96
64
RT Cores
60
—
L1 Cache
128 KB per Array
16 KB (per CU)
L2 Cache
4 MB
1024 KB
L3 Cache
128 MB
—
Theoretical Performance
Pixel Rate
202.1 GPixel/s
67.20 GPixel/s
Texture Rate
505.2 GTexel/s
184.8 GTexel/s
FP16 (half)
32.33 TFLOPS
—
FP32 (float)
16.17 TFLOPS
5.914 TFLOPS
FP64 (double)
1010 GFLOPS
739.2 GFLOPS
Graphics Processor
GPU Name
Navi 21
Grenada
GPU Variant
Navi 21 XL(215-121000187)
Grenada XT(215-0880004)
Architecture
RDNA 2.0
GCN 2.0
Foundry
TSMC
TSMC
Process Size
7 nm
28 nm
Transistors
26.8 billion
6.2 billion
Die Size
520 mm²
438 mm²
Board Design
TDP
250W
275W
Suggested PSU
600 W
600 W
Outputs
1x HDMI 2.12x DisplayPort 1.4a1x USB Type-C
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
Power Connectors
2x 8-pin
1x 6-pin + 1x 8-pin
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
16,182
—
3DMark Time Spy Extreme
7,771
—
3DMark Speed Way
3,062
—
▲ Specs Compare
Data sourced from official specifications and benchmark tests.