AMD Radeon R9 285X vs AMD Radeon Instinct MI455X
GPU · Specs Compare
Graphics Card
Release Date
Unknown
Jul 2026
Generation
Volcanic Islands
Radeon Instinct
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 6.0 x16
Clock Speeds
Memory Clock
1375 MHz
1900 MHz
Base Clock
—
1000 MHz
Boost Clock
—
2400 MHz
Memory
Memory Size
3GB
432GB
Memory Type
GDDR5
HBM4
Memory Bus
384bit
24576bit
Bandwidth
264.0GB/s
23.3TB/s
Render Config
Compute Units
32
256
Shading Units
2048
32768
TMUs
128
1024
ROPs
32
0
L1 Cache
16 KB (per CU)
32 KB (per CU)
L2 Cache
768 KB
192 MB
Theoretical Performance
Pixel Rate
32.06 GPixel/s
0 MPixel/s
Texture Rate
128.3 GTexel/s
2457.6 GTexel/s
FP32 (float)
4.104 TFLOPS
157.3 TFLOPS
FP16 (half)
—
157.3 TFLOPS
FP64 (double)
—
2.458 TFLOPS
Graphics Processor
GPU Name
Tonga
MI450 256CU
GPU Variant
Tonga XT(215-0851313)
—
Architecture
GCN 3.0
CDNA 5.0
Foundry
TSMC
TSMC
Process Size
28 nm
2 nm
Transistors
5 billion
320 billion
Die Size
366 mm²
Unknown
Board Design
TDP
200W
2300W
Suggested PSU
550 W
2700 W
Outputs
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
No outputs
Power Connectors
1x 6-pin + 1x 8-pin
None
Graphics Features
DirectX
12 (12_0)
N/A
OpenGL
4.6
N/A
OpenCL
2.0
3.0
Vulkan
1.2
N/A
Shader Model
6.3
N/A
▲ Specs Compare
Data sourced from official specifications and benchmark tests.