AMD Radeon RX 6600 XT vs ATI Radeon HD 4890

VS

AMD Radeon RX 6600 XT

ATI Radeon HD 4890

We compared two Desktop platform GPUs: 8GB VRAM Radeon RX 6600 XT and 1024MB VRAM Radeon HD 4890 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 12 years and 3 months late

Boost Clock2589MHz

More VRAM (8GB vs 1024GB)

Larger VRAM bandwidth (256.0GB/s vs 124.8GB/s)

1248 additional rendering cores

Lower TDP (160W vs 190W)

Score

Benchmark

FP32 (float)

Radeon RX 6600 XT +679%

10.6 TFLOPS

Radeon HD 4890

1.36 TFLOPS

Radeon RX 6600 XT

VS

Radeon HD 4890

Graphics Card

Jul 2021

Release Date

Apr 2009

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

975 MHz

Memory

8GB

Memory Size

1024MB

GDDR6

Memory Type

GDDR5

128bit

Memory Bus

256bit

256.0GB/s

Bandwidth

124.8GB/s

Render Config

32

Compute Units

10

-

2048

Shading Units

800

128

TMUs

40

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

13.60 GPixel/s

331.4 GTexel/s

Texture Rate

34.00 GTexel/s

21.21 TFLOPS

FP16 (half)

-

10.60 TFLOPS

FP32 (float)

1360 GFLOPS

662.8 GFLOPS

FP64 (double)

272.0 GFLOPS

Board Design

160W

TDP

190W

450 W

Suggested PSU

450 W

1x HDMI 2.1 3x DisplayPort 1.4a

Outputs

2x DVI 1x S-Video

1x 8-pin

Power Connectors

2x 6-pin

Graphics Processor

Navi 23

GPU Name

RV790

Navi 23 XT (215-130000006)

GPU Variant

RV790 XT (215-0758016)

RDNA 2.0

Architecture

TeraScale

TSMC

Foundry

TSMC

7 nm

Process Size

55 nm

11.06 billion

Transistors

0.959 billion

237 mm²

Die Size

282 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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