AMD Radeon RX 7900 XT vs AMD Radeon HD 6870

VS

AMD Radeon RX 7900 XT

AMD Radeon HD 6870

We compared two Desktop platform GPUs: 20GB VRAM Radeon RX 7900 XT and 1024MB VRAM Radeon HD 6870 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 7900 XT 's Advantages

Released 12 years and 1 months late

Boost Clock2394MHz

More VRAM (20GB vs 1024GB)

Larger VRAM bandwidth (800.0GB/s vs 134.4GB/s)

4256 additional rendering cores

AMD Radeon HD 6870 's Advantages

Lower TDP (151W vs 300W)

Score

Benchmark

FP32 (float)

Radeon RX 7900 XT +2453%

51.48 TFLOPS

Radeon HD 6870

2.016 TFLOPS

Radeon RX 7900 XT

VS

Radeon HD 6870

Graphics Card

Nov 2022

Release Date

Oct 2010

Navi III

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

1387 MHz

Base Clock

-

2394 MHz

Boost Clock

-

2500 MHz

Memory Clock

1050 MHz

Memory

20GB

Memory Size

1024MB

GDDR6

Memory Type

GDDR5

320bit

Memory Bus

256bit

800.0GB/s

Bandwidth

134.4GB/s

Render Config

84

Compute Units

14

-

5376

Shading Units

1120

336

TMUs

56

192

ROPs

32

-

84

RT Cores

-

256 KB per Array

L1 Cache

8 KB (per CU)

6 MB

L2 Cache

512 KB

80 MB

L3 Cache

-

Theoretical Performance

459.6 GPixel/s

Pixel Rate

28.80 GPixel/s

804.4 GTexel/s

Texture Rate

50.40 GTexel/s

103.0 TFLOPS

FP16 (half)

-

51.48 TFLOPS

FP32 (float)

2.016 TFLOPS

1.609 TFLOPS

FP64 (double)

-

Board Design

300W

TDP

151W

700 W

Suggested PSU

450 W

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

Outputs

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

2x 8-pin

Power Connectors

2x 6-pin

Graphics Processor

Navi 31

GPU Name

Barts

Navi 31 XT (215-145000156)

GPU Variant

Barts XT (215-0798000)

RDNA 3.0

Architecture

TeraScale 2

TSMC

Foundry

TSMC

5 nm

Process Size

40 nm

57.7 billion

Transistors

1.7 billion

529 mm²

Die Size

255 mm²

Graphics Features

12 Ultimate (12_2)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

2.2

OpenCL

1.2

1.3

Vulkan

N/A

-

6.7

Shader Model

5.0

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