AMD Radeon Instinct MI455X vs AMD Radeon RX 640 Mobile
GPU Specs Compare
Graphics Card
Release Date
Jul 2026
May 2019
Generation
Radeon Instinct
Mobility Radeon
Type
Desktop
Mobile
Bus Interface
PCIe 6.0 x16
PCIe 3.0 x8
Clock Speeds
Base Clock
1000 MHz
1082 MHz
Boost Clock
2400 MHz
1218 MHz
Memory Clock
1900 MHz
1500 MHz
Memory
Memory Size
432GB
2GB
Memory Type
HBM4
GDDR5
Memory Bus
24576bit
64bit
Bandwidth
23.3TB/s
48.00GB/s
Render Config
Compute Units
256
10
Shading Units
32768
640
TMUs
1024
40
ROPs
0
16
L1 Cache
32 KB (per CU)
16 KB (per CU)
L2 Cache
192 MB
512 KB
Theoretical Performance
Pixel Rate
0 MPixel/s
19.49 GPixel/s
Texture Rate
2457.6 GTexel/s
48.72 GTexel/s
FP16 (half)
157.3 TFLOPS
1.559 TFLOPS
FP32 (float)
157.3 TFLOPS
1.559 TFLOPS
FP64 (double)
2.458 TFLOPS
97.44 GFLOPS
Graphics Processor
GPU Name
MI450 256CU
Polaris 23
Architecture
CDNA 5.0
GCN 4.0
Foundry
TSMC
GlobalFoundries
Process Size
2 nm
14 nm
Transistors
320 billion
2.2 billion
Die Size
Unknown
103 mm²
GPU Variant
-
Polaris 23 XT
Board Design
TDP
2300W
50W
Suggested PSU
2700 W
-
Outputs
No outputs
No outputs
Power Connectors
None
None
Graphics Features
DirectX
N/A
12 (12_0)
OpenGL
N/A
4.6
OpenCL
3.0
2.1
Vulkan
N/A
1.2
Shader Model
N/A
6.4