AMD Radeon RX 6600 XT vs ATI Radeon HD 4855

VS

AMD Radeon RX 6600 XT

ATI Radeon HD 4855

We compared two Desktop platform GPUs: 8GB VRAM Radeon RX 6600 XT and 512MB VRAM Radeon HD 4855 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 11 years and 6 months late

Boost Clock2589MHz

More VRAM (8GB vs 512GB)

Larger VRAM bandwidth (256.0GB/s vs 115.2GB/s)

1408 additional rendering cores

ATI Radeon HD 4855 's Advantages

Lower TDP (110W vs 160W)

Score

Benchmark

FP32 (float)

Radeon RX 6600 XT +1340%

10.6 TFLOPS

Radeon HD 4855

0.736 TFLOPS

Radeon RX 6600 XT

VS

Radeon HD 4855

Graphics Card

Jul 2021

Release Date

Jan 2010

Navi II

Generation

Radeon R700

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

900 MHz

Memory

8GB

Memory Size

512MB

GDDR6

Memory Type

GDDR5

128bit

Memory Bus

256bit

256.0GB/s

Bandwidth

115.2GB/s

Render Config

32

Compute Units

8

-

2048

Shading Units

640

128

TMUs

32

64

ROPs

16

-

32

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per CU)

2 MB

L2 Cache

256 KB

32 MB

L3 Cache

-

Theoretical Performance

165.7 GPixel/s

Pixel Rate

9.200 GPixel/s

331.4 GTexel/s

Texture Rate

18.40 GTexel/s

21.21 TFLOPS

FP16 (half)

-

10.60 TFLOPS

FP32 (float)

736.0 GFLOPS

662.8 GFLOPS

FP64 (double)

147.2 GFLOPS

Board Design

160W

TDP

110W

450 W

Suggested PSU

300 W

1x HDMI 2.1 3x DisplayPort 1.4a

Outputs

1x DVI 1x HDMI 1.3a 1x VGA

1x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

Navi 23

GPU Name

RV770

Navi 23 XT (215-130000006)

GPU Variant

RV770 PRO (215-0669065)

RDNA 2.0

Architecture

TeraScale

TSMC

Foundry

TSMC

7 nm

Process Size

55 nm

11.06 billion

Transistors

0.956 billion

237 mm²

Die Size

256 mm²

Graphics Features

12 Ultimate (12_2)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3

2.1

OpenCL

1.1

1.3

Vulkan

N/A

-

6.7

Shader Model

4.1

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