AMD Radeon RX 6900 XT vs AMD Radeon HD 6870 X2

VS

AMD Radeon RX 6900 XT

AMD Radeon HD 6870 X2

We compared two Desktop platform GPUs: 16GB VRAM Radeon RX 6900 XT and 1024MB VRAM Radeon HD 6870 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6900 XT 's Advantages

Released 9 years and 3 months late

Boost Clock2250MHz

More VRAM (16GB vs 1024GB)

Larger VRAM bandwidth (512.0GB/s vs 134.4GB/s)

4000 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon RX 6900 XT +1042%

23.04 TFLOPS

Radeon HD 6870 X2

2.016 TFLOPS

Radeon RX 6900 XT

VS

Radeon HD 6870 X2

Graphics Card

Oct 2020

Release Date

Jul 2011

Navi II

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

1825 MHz

Base Clock

-

2250 MHz

Boost Clock

-

2000 MHz

Memory Clock

1050 MHz

Memory

16GB

Memory Size

1024MB

GDDR6

Memory Type

GDDR5

256bit

Memory Bus

256bit

512.0GB/s

Bandwidth

134.4GB/s

Render Config

80

Compute Units

14

-

5120

Shading Units

1120

320

TMUs

56

128

ROPs

32

-

80

RT Cores

-

128 KB per Array

L1 Cache

8 KB (per CU)

4 MB

L2 Cache

512 KB

128 MB

L3 Cache

-

Theoretical Performance

288.0 GPixel/s

Pixel Rate

28.80 GPixel/s

720.0 GTexel/s

Texture Rate

50.40 GTexel/s

46.08 TFLOPS

FP16 (half)

-

23.04 TFLOPS

FP32 (float)

2.016 TFLOPS

1440 GFLOPS

FP64 (double)

-

Board Design

300W

TDP

300W

700 W

Suggested PSU

700 W

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

Outputs

2x DVI 1x HDMI 1.3a 2x mini-DisplayPort 1.1

2x 8-pin

Power Connectors

-

Graphics Processor

Navi 21

GPU Name

Barts

Navi 21 XTX (215-121000167)

GPU Variant

Barts XT (215-0798000)

RDNA 2.0

Architecture

TeraScale 2

TSMC

Foundry

TSMC

7 nm

Process Size

40 nm

26.8 billion

Transistors

1.7 billion

520 mm²

Die Size

255 mm²

Graphics Features

12 Ultimate (12_2)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

2.1

OpenCL

1.2

1.3

Vulkan

N/A

-

6.5

Shader Model

5.0

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