AMD Radeon RX 6600 vs AMD Radeon HD 6870 X2

VS

AMD Radeon RX 6600

AMD Radeon HD 6870 X2

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

Released 10 years and 3 months late

Boost Clock2491MHz

More VRAM (8GB vs 1024GB)

Larger VRAM bandwidth (224.0GB/s vs 134.4GB/s)

672 additional rendering cores

Lower TDP (132W vs 300W)

Score

Benchmark

FP32 (float)

Radeon RX 6600 +342%

8.928 TFLOPS

Radeon HD 6870 X2

2.016 TFLOPS

Radeon RX 6600

VS

Radeon HD 6870 X2

Graphics Card

Oct 2021

Release Date

Jul 2011

Navi II

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 4.0 x8

Bus Interface

PCIe 2.0 x16

Clock Speeds

1626 MHz

Base Clock

-

2491 MHz

Boost Clock

-

1750 MHz

Memory Clock

1050 MHz

Memory

8GB

Memory Size

1024MB

GDDR6

Memory Type

GDDR5

128bit

Memory Bus

256bit

224.0GB/s

Bandwidth

134.4GB/s

Render Config

28

Compute Units

14

-

1792

Shading Units

1120

112

TMUs

56

64

ROPs

32

-

28

RT Cores

-

128 KB per Array

L1 Cache

8 KB (per CU)

2 MB

L2 Cache

512 KB

32 MB

L3 Cache

-

Theoretical Performance

159.4 GPixel/s

Pixel Rate

28.80 GPixel/s

279.0 GTexel/s

Texture Rate

50.40 GTexel/s

17.86 TFLOPS

FP16 (half)

-

8.928 TFLOPS

FP32 (float)

2.016 TFLOPS

558.0 GFLOPS

FP64 (double)

-

Board Design

132W

TDP

300W

300 W

Suggested PSU

700 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

-

Graphics Processor

Navi 23

GPU Name

Barts

Navi 23 XL (215-130000016)

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

-

6.5

Shader Model

5.0

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