AMD Radeon RX 6400 vs AMD Radeon HD 7990

VS

We compared two Desktop platform GPUs: 4GB VRAM Radeon RX 6400 and 3GB VRAM Radeon HD 7990 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6400 's Advantages

Released 8 years and 9 months late

Boost Clock has increased by 132% (2321MHz vs 1000MHz)

More VRAM (4GB vs 3GB)

Lower TDP (53W vs 375W)

AMD Radeon HD 7990 's Advantages

Larger VRAM bandwidth (288.0GB/s vs 128.0GB/s)

1280 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon RX 6400

3.565 TFLOPS

Radeon HD 7990 +14%

4.096 TFLOPS

Radeon RX 6400

VS

Radeon HD 7990

Graphics Card

Jan 2022

Release Date

Apr 2013

Navi II

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 4.0 x4

Bus Interface

PCIe 3.0 x16

Clock Speeds

1923 MHz

Base Clock

950 MHz

2321 MHz

Boost Clock

1000 MHz

2000 MHz

Memory Clock

1500 MHz

Memory

4GB

Memory Size

3GB

GDDR6

Memory Type

GDDR5

64bit

Memory Bus

384bit

128.0GB/s

Bandwidth

288.0GB/s

Render Config

-

SM Count

-

12

Compute Units

32

768

Shading Units

2048

48

TMUs

128

32

ROPs

32

-

Tensor Cores

-

12

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per CU)

1024 KB

L2 Cache

768 KB

Theoretical Performance

74.27 GPixel/s

Pixel Rate

32.00 GPixel/s

111.4 GTexel/s

Texture Rate

128.0 GTexel/s

7.130 TFLOPS

FP16 (half)

-

3.565 TFLOPS

FP32 (float)

4.096 TFLOPS

222.8 GFLOPS

FP64 (double)

1024 GFLOPS

Graphics Processor

Navi 24

GPU Name

Malta

Navi 24 XL (215-135000046)

GPU Variant

Malta XT (215-0849026)

RDNA 2.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

6 nm

Process Size

28 nm

5.4 billion

Transistors

4.313 billion

107 mm²

Die Size

365 mm²

Board Design

53W

TDP

375W

250 W

Suggested PSU

750 W

1x HDMI 2.1 1x DisplayPort 1.4a

Outputs

1x DVI 4x mini-DisplayPort 1.2

None

Power Connectors

2x 8-pin

Graphics Features

12 Ultimate (12_2)

DirectX

12 (11_1)

4.6

OpenGL

4.6

2.2

OpenCL

1.2

1.3

Vulkan

1.2

-

CUDA

-

6.6

Shader Model

5.1

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