AMD Radeon RX 6900 XTX vs AMD Radeon R9 285X

VS

AMD Radeon RX 6900 XTX AMD Radeon R9 285X

We compared two Desktop platform GPUs: 16GB VRAM Radeon RX 6900 XTX and 3GB VRAM Radeon R9 285X to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6900 XTX 's Advantages

Boost Clock2435MHz

More VRAM (16GB vs 3GB)

Larger VRAM bandwidth (576.0GB/s vs 264.0GB/s)

3072 additional rendering cores

AMD Radeon R9 285X 's Advantages

Lower TDP (200W vs 330W)

Score

Benchmark

FP32 (float)

Radeon RX 6900 XTX +507%

24.93 TFLOPS

Radeon R9 285X

4.104 TFLOPS

Radeon RX 6900 XTX

VS

Radeon R9 285X

Graphics Card

Unknown

Release Date

Unknown

Navi II

Generation

Volcanic Islands

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

2075 MHz

Base Clock

-

2435 MHz

Boost Clock

-

2250 MHz

Memory Clock

1375 MHz

Memory

16GB

Memory Size

3GB

GDDR6

Memory Type

GDDR5

256bit

Memory Bus

384bit

576.0GB/s

Bandwidth

264.0GB/s

Render Config

-

SM Count

-

80

Compute Units

32

5120

Shading Units

2048

320

TMUs

128

ROPs

32

-

Tensor Cores

-

80

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per CU)

4 MB

L2 Cache

768 KB

Theoretical Performance

311.7 GPixel/s

Pixel Rate

32.06 GPixel/s

779.2 GTexel/s

Texture Rate

128.3 GTexel/s

49.87 TFLOPS

FP16 (half)

-

24.93 TFLOPS

FP32 (float)

4.104 TFLOPS

1.558 TFLOPS

FP64 (double)

-

Graphics Processor

Navi 21

GPU Name

Tonga

Navi 21 XTXH (215-121000247)

GPU Variant

Tonga XT (215-0851313)

RDNA 2.0

Architecture

GCN 3.0

TSMC

Foundry

TSMC

7 nm

Process Size

28 nm

26.8 billion

Transistors

5 billion

520 mm²

Die Size

366 mm²

Board Design

330W

TDP

200W

700 W

Suggested PSU

550 W

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

Outputs

2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2

2x 8-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Features

12 Ultimate (12_2)

DirectX

12 (12_0)

4.6

OpenGL

4.6

2.1

OpenCL

2.0

1.3

Vulkan

1.2

-

CUDA

-

6.5

Shader Model

6.3

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