AMD Radeon RX 7800 XT vs ATI Radeon HD 4855

VS

AMD Radeon RX 7800 XT

ATI Radeon HD 4855

We compared two Desktop platform GPUs: 16GB VRAM Radeon RX 7800 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 7800 XT 's Advantages

Released 13 years and 7 months late

Boost Clock2430MHz

More VRAM (16GB vs 512GB)

Larger VRAM bandwidth (624.1GB/s vs 115.2GB/s)

3200 additional rendering cores

ATI Radeon HD 4855 's Advantages

Lower TDP (110W vs 263W)

Score

Benchmark

FP32 (float)

Radeon RX 7800 XT +4970%

37.32 TFLOPS

Radeon HD 4855

0.736 TFLOPS

Radeon RX 7800 XT

VS

Radeon HD 4855

Graphics Card

Aug 2023

Release Date

Jan 2010

Navi III

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

1295 MHz

Base Clock

-

2430 MHz

Boost Clock

-

2438 MHz

Memory Clock

900 MHz

Memory

16GB

Memory Size

512MB

GDDR6

Memory Type

GDDR5

256bit

Memory Bus

256bit

624.1GB/s

Bandwidth

115.2GB/s

Render Config

60

Compute Units

8

-

3840

Shading Units

640

240

TMUs

32

96

ROPs

16

-

60

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per CU)

4 MB

L2 Cache

256 KB

64 MB

L3 Cache

-

Theoretical Performance

233.3 GPixel/s

Pixel Rate

9.200 GPixel/s

583.2 GTexel/s

Texture Rate

18.40 GTexel/s

74.65 TFLOPS

FP16 (half)

-

37.32 TFLOPS

FP32 (float)

736.0 GFLOPS

1166 GFLOPS

FP64 (double)

147.2 GFLOPS

Board Design

263W

TDP

110W

600 W

Suggested PSU

300 W

1x HDMI 2.1a 3x DisplayPort 2.1

Outputs

1x DVI 1x HDMI 1.3a 1x VGA

2x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

Navi 32

GPU Name

RV770

Navi 32 XT (215-180000006)

GPU Variant

RV770 PRO (215-0669065)

RDNA 3.0

Architecture

TeraScale

TSMC

Foundry

TSMC

5 nm

Process Size

55 nm

28.1 billion

Transistors

0.956 billion

346 mm²

Die Size

256 mm²

Graphics Features

12 Ultimate (12_2)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3

2.2

OpenCL

1.1

1.3

Vulkan

N/A

-

6.7

Shader Model

4.1

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