AMD Radeon R9 255 OEM vs AMD Radeon RX 6900 XT

VS

AMD Radeon R9 255 OEM

AMD Radeon RX 6900 XT

We compared two Desktop platform GPUs: 2GB VRAM Radeon R9 255 OEM and 16GB VRAM Radeon RX 6900 XT to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 255 OEM 's Advantages

Lower TDP (65W vs 300W)

AMD Radeon RX 6900 XT 's Advantages

Released 6 years and 10 months late

Boost Clock has increased by 142% (2250MHz vs 930MHz)

More VRAM (16GB vs 2GB)

Larger VRAM bandwidth (512.0GB/s vs 73.60GB/s)

4608 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon R9 255 OEM

0.952 TFLOPS

Radeon RX 6900 XT +2320%

23.04 TFLOPS

Radeon R9 255 OEM

VS

Radeon RX 6900 XT

Graphics Card

Dec 2013

Release Date

Oct 2020

Volcanic Islands

Generation

Navi II

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 4.0 x16

Clock Speeds

900 MHz

Base Clock

1825 MHz

930 MHz

Boost Clock

2250 MHz

1150 MHz

Memory Clock

2000 MHz

Memory

2GB

Memory Size

16GB

GDDR5

Memory Type

GDDR6

128bit

Memory Bus

256bit

73.60GB/s

Bandwidth

512.0GB/s

Render Config

8

Compute Units

80

-

512

Shading Units

5120

32

TMUs

320

16

ROPs

128

-

RT Cores

80

16 KB (per CU)

L1 Cache

128 KB per Array

256 KB

L2 Cache

4 MB

-

L3 Cache

128 MB

Theoretical Performance

14.88 GPixel/s

Pixel Rate

288.0 GPixel/s

29.76 GTexel/s

Texture Rate

720.0 GTexel/s

-

FP16 (half)

46.08 TFLOPS

952.3 GFLOPS

FP32 (float)

23.04 TFLOPS

59.52 GFLOPS

FP64 (double)

1440 GFLOPS

Board Design

65W

TDP

300W

250 W

Suggested PSU

700 W

No outputs

Outputs

1x HDMI 2.1 2x DisplayPort 1.4a 1x USB Type-C

1x 6-pin

Power Connectors

2x 8-pin

Graphics Processor

Cape Verde

GPU Name

Navi 21

Cape Verde PRX

GPU Variant

Navi 21 XTX (215-121000167)

GCN 1.0

Architecture

RDNA 2.0

TSMC

Foundry

TSMC

28 nm

Process Size

7 nm

1.5 billion

Transistors

26.8 billion

123 mm²

Die Size

520 mm²

Graphics Features

12 (11_1)

DirectX

12 Ultimate (12_2)

4.6

OpenGL

4.6

1.2

OpenCL

2.1

1.2

Vulkan

1.3

-

5.1

Shader Model

6.5

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