AMD Radeon RX 6900 XTX vs AMD Radeon Instinct MI455X
GPU Specs Compare
Graphics Card
Release Date
Unknown
Jul 2026
Generation
Navi II
Radeon Instinct
Type
Desktop
Desktop
Bus Interface
PCIe 4.0 x16
PCIe 6.0 x16
Clock Speeds
Base Clock
2075 MHz
1000 MHz
Boost Clock
2435 MHz
2400 MHz
Memory Clock
2250 MHz
1900 MHz
Memory
Memory Size
16GB
432GB
Memory Type
GDDR6
HBM4
Memory Bus
256bit
24576bit
Bandwidth
576.0GB/s
23.3TB/s
Render Config
Compute Units
80
256
Shading Units
5120
32768
TMUs
320
1024
ROPs
128
0
RT Cores
80
-
L1 Cache
128 KB per Array
32 KB (per CU)
L2 Cache
4 MB
192 MB
L3 Cache
128 MB
-
Theoretical Performance
Pixel Rate
311.7 GPixel/s
0 MPixel/s
Texture Rate
779.2 GTexel/s
2457.6 GTexel/s
FP16 (half)
49.87 TFLOPS
157.3 TFLOPS
FP32 (float)
24.93 TFLOPS
157.3 TFLOPS
FP64 (double)
1.558 TFLOPS
2.458 TFLOPS
Graphics Processor
GPU Name
Navi 21
MI450 256CU
GPU Variant
Navi 21 XTXH(215-121000247)
-
Architecture
RDNA 2.0
CDNA 5.0
Foundry
TSMC
TSMC
Process Size
7 nm
2 nm
Transistors
26.8 billion
320 billion
Die Size
520 mm²
Unknown
Board Design
TDP
330W
2300W
Suggested PSU
700 W
2700 W
Outputs
1x HDMI 2.12x DisplayPort 1.4a1x USB Type-C
No outputs
Power Connectors
2x 8-pin
None
Graphics Features
DirectX
12 Ultimate (12_2)
N/A
OpenGL
4.6
N/A
OpenCL
2.1
3.0
Vulkan
1.3
N/A
Shader Model
6.5
N/A