AMD Radeon RX 6400 vs AMD Radeon R9 255 OEM

VS

AMD Radeon RX 6400

AMD Radeon R9 255 OEM

We compared two Desktop platform GPUs: 4GB VRAM Radeon RX 6400 and 2GB VRAM Radeon R9 255 OEM 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 1 months late

Boost Clock has increased by 150% (2321MHz vs 930MHz)

More VRAM (4GB vs 2GB)

Larger VRAM bandwidth (128.0GB/s vs 73.60GB/s)

256 additional rendering cores

Lower TDP (53W vs 65W)

Score

Benchmark

FP32 (float)

Radeon RX 6400 +274%

3.565 TFLOPS

Radeon R9 255 OEM

0.952 TFLOPS

Radeon RX 6400

VS

Radeon R9 255 OEM

Graphics Card

Jan 2022

Release Date

Dec 2013

Navi II

Generation

Volcanic Islands

Desktop

Type

Desktop

PCIe 4.0 x4

Bus Interface

PCIe 3.0 x16

Clock Speeds

1923 MHz

Base Clock

900 MHz

2321 MHz

Boost Clock

930 MHz

2000 MHz

Memory Clock

1150 MHz

Memory

4GB

Memory Size

2GB

GDDR6

Memory Type

GDDR5

64bit

Memory Bus

128bit

128.0GB/s

Bandwidth

73.60GB/s

Render Config

12

Compute Units

8

-

768

Shading Units

512

48

TMUs

32

ROPs

16

-

12

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per CU)

1024 KB

L2 Cache

256 KB

16 MB

L3 Cache

-

Theoretical Performance

74.27 GPixel/s

Pixel Rate

14.88 GPixel/s

111.4 GTexel/s

Texture Rate

29.76 GTexel/s

7.130 TFLOPS

FP16 (half)

-

3.565 TFLOPS

FP32 (float)

952.3 GFLOPS

222.8 GFLOPS

FP64 (double)

59.52 GFLOPS

Board Design

53W

TDP

65W

250 W

Suggested PSU

250 W

1x HDMI 2.1 1x DisplayPort 1.4a

Outputs

No outputs

None

Power Connectors

1x 6-pin

Graphics Processor

Navi 24

GPU Name

Cape Verde

Navi 24 XL (215-135000046)

GPU Variant

Cape Verde PRX

RDNA 2.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

6 nm

Process Size

28 nm

5.4 billion

Transistors

1.5 billion

107 mm²

Die Size

123 mm²

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

-

6.7

Shader Model

5.1

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