AMD Radeon HD 7990 vs AMD Radeon Instinct MI455X
GPU · Specs Compare
Graphics Card
Release Date
Apr 2013
Jul 2026
Generation
Southern Islands
Radeon Instinct
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 6.0 x16
Clock Speeds
Base Clock
950 MHz
1000 MHz
Boost Clock
1000 MHz
2400 MHz
Memory Clock
1500 MHz
1900 MHz
Memory
Memory Size
3GB
432GB
Memory Type
GDDR5
HBM4
Memory Bus
384bit
24576bit
Bandwidth
288.0GB/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
32.00 GPixel/s
0 MPixel/s
Texture Rate
128.0 GTexel/s
2457.6 GTexel/s
FP32 (float)
4.096 TFLOPS
157.3 TFLOPS
FP64 (double)
1024 GFLOPS
2.458 TFLOPS
FP16 (half)
—
157.3 TFLOPS
Graphics Processor
GPU Name
Malta
MI450 256CU
GPU Variant
Malta XT(215-0849026)
—
Architecture
GCN 1.0
CDNA 5.0
Foundry
TSMC
TSMC
Process Size
28 nm
2 nm
Transistors
4.313 billion
320 billion
Die Size
365 mm²
Unknown
Board Design
TDP
375W
2300W
Suggested PSU
750 W
2700 W
Outputs
1x DVI4x mini-DisplayPort 1.2
No outputs
Power Connectors
2x 8-pin
None
Graphics Features
DirectX
12 (11_1)
N/A
OpenGL
4.6
N/A
OpenCL
1.2
3.0
Vulkan
1.2
N/A
Shader Model
5.1
N/A
▲ Specs Compare
Data sourced from official specifications and benchmark tests.