AMD Radeon RX 6600 XT vs AMD Radeon HD 6990

VS

AMD Radeon RX 6600 XT

AMD Radeon HD 6990

We compared two Desktop platform GPUs: 8GB VRAM Radeon RX 6600 XT and 2GB VRAM Radeon HD 6990 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 4 months late

Boost Clock2589MHz

More VRAM (8GB vs 2GB)

Larger VRAM bandwidth (256.0GB/s vs 160.0GB/s)

512 additional rendering cores

Lower TDP (160W vs 375W)

Score

Benchmark

FP32 (float)

Radeon RX 6600 XT +315%

10.6 TFLOPS

Radeon HD 6990

2.55 TFLOPS

Radeon RX 6600 XT

VS

Radeon HD 6990

Graphics Card

Jul 2021

Release Date

Mar 2011

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

1250 MHz

Memory

8GB

Memory Size

2GB

GDDR6

Memory Type

GDDR5

128bit

Memory Bus

256bit

256.0GB/s

Bandwidth

160.0GB/s

Render Config

32

Compute Units

24

-

2048

Shading Units

1536

128

TMUs

96

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

26.56 GPixel/s

331.4 GTexel/s

Texture Rate

79.68 GTexel/s

21.21 TFLOPS

FP16 (half)

-

10.60 TFLOPS

FP32 (float)

2.550 TFLOPS

662.8 GFLOPS

FP64 (double)

637.4 GFLOPS

Board Design

160W

TDP

375W

450 W

Suggested PSU

750 W

1x HDMI 2.1 3x DisplayPort 1.4a

Outputs

1x DVI 4x mini-DisplayPort 1.2

1x 8-pin

Power Connectors

2x 8-pin

Graphics Processor

Navi 23

GPU Name

Antilles

Navi 23 XT (215-130000006)

GPU Variant

Antilles XT (215-0807027)

RDNA 2.0

Architecture

TeraScale 3

TSMC

Foundry

TSMC

7 nm

Process Size

40 nm

11.06 billion

Transistors

2.64 billion

237 mm²

Die Size

389 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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