AMD Radeon Instinct MI355X vs AMD Radeon RX 6800 XT
GPU · Specs Compare
Graphics Card
Release Date
Jun 2025
Oct 2020
Generation
Radeon Instinct
Navi II
Type
Professional
Desktop
Bus Interface
PCIe 5.0 x16
PCIe 4.0 x16
Clock Speeds
Base Clock
1000 MHz
1825 MHz
Boost Clock
2400 MHz
2250 MHz
Memory Clock
2000 MHz
2000 MHz
Memory
Memory Size
288GB
16GB
Memory Type
HBM3e
GDDR6
Memory Bus
8192bit
256bit
Bandwidth
8.19TB/s
512.0GB/s
Render Config
Compute Units
256
72
Shading Units
16384
4608
TMUs
1024
288
ROPs
0
128
Tensor Cores
1216
—
L1 Cache
32 KB (per CU)
128 KB per Array
L2 Cache
32 MB
4 MB
L3 Cache
256 MB
128 MB
RT Cores
—
72
Theoretical Performance
Pixel Rate
0 MPixel/s
288.0 GPixel/s
Texture Rate
2457.6 GTexel/s
648.0 GTexel/s
FP16 (half)
78.64 TFLOPS
41.47 TFLOPS
FP32 (float)
78.64 TFLOPS
20.74 TFLOPS
FP64 (double)
39.32 TFLOPS
1296 GFLOPS
Graphics Processor
GPU Name
MI350 256CU
Navi 21
Architecture
CDNA 4.0
RDNA 2.0
Foundry
TSMC
TSMC
Process Size
3 nm
7 nm
Transistors
185 billion
26.8 billion
Die Size
Unknown
520 mm²
GPU Variant
—
Navi 21 XT(215-121000177)
Board Design
TDP
1400W
300W
Suggested PSU
1800 W
700 W
Outputs
No outputs
1x HDMI 2.12x DisplayPort 1.4a1x USB Type-C
Power Connectors
None
2x 8-pin
Graphics Features
DirectX
N/A
12 Ultimate (12_2)
OpenGL
N/A
4.6
OpenCL
3.0
2.1
Vulkan
N/A
1.3
Shader Model
N/A
6.5
Benchmark
3DMark Time Spy
—
19,329
▲ Specs Compare
Data sourced from official specifications and benchmark tests.