AMD Radeon RX 6600 XT vs AMD Radeon HD 6870

VS

AMD Radeon RX 6600 XT

AMD Radeon HD 6870

We compared two Desktop platform GPUs: 8GB VRAM Radeon RX 6600 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 6600 XT 's Advantages

Released 10 years and 9 months late

Boost Clock2589MHz

More VRAM (8GB vs 1024GB)

Larger VRAM bandwidth (256.0GB/s vs 134.4GB/s)

928 additional rendering cores

AMD Radeon HD 6870 's Advantages

Lower TDP (151W vs 160W)

Score

Benchmark

FP32 (float)

Radeon RX 6600 XT +425%

10.6 TFLOPS

Radeon HD 6870

2.016 TFLOPS

Radeon RX 6600 XT

VS

Radeon HD 6870

Graphics Card

Jul 2021

Release Date

Oct 2010

Navi II

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 4.0 x8

Bus Interface

PCIe 2.0 x16

Clock Speeds

1968 MHz

Base Clock

-

2589 MHz

Boost Clock

-

2000 MHz

Memory Clock

1050 MHz

Memory

8GB

Memory Size

1024MB

GDDR6

Memory Type

GDDR5

128bit

Memory Bus

256bit

256.0GB/s

Bandwidth

134.4GB/s

Render Config

32

Compute Units

14

-

2048

Shading Units

1120

128

TMUs

56

64

ROPs

32

-

32

RT Cores

-

128 KB per Array

L1 Cache

8 KB (per CU)

2 MB

L2 Cache

512 KB

32 MB

L3 Cache

-

Theoretical Performance

165.7 GPixel/s

Pixel Rate

28.80 GPixel/s

331.4 GTexel/s

Texture Rate

50.40 GTexel/s

21.21 TFLOPS

FP16 (half)

-

10.60 TFLOPS

FP32 (float)

2.016 TFLOPS

662.8 GFLOPS

FP64 (double)

-

Board Design

160W

TDP

151W

450 W

Suggested PSU

450 W

1x HDMI 2.1 3x DisplayPort 1.4a

Outputs

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

1x 8-pin

Power Connectors

2x 6-pin

Graphics Processor

Navi 23

GPU Name

Barts

Navi 23 XT (215-130000006)

GPU Variant

Barts XT (215-0798000)

RDNA 2.0

Architecture

TeraScale 2

TSMC

Foundry

TSMC

7 nm

Process Size

40 nm

11.06 billion

Transistors

1.7 billion

237 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

-

6.7

Shader Model

5.0

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