AMD Radeon HD 6990 vs AMD Radeon RX 6600 XT

VS

AMD Radeon HD 6990 AMD Radeon RX 6600 XT

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

2.55 TFLOPS

Radeon RX 6600 XT +315%

10.6 TFLOPS

Radeon HD 6990

VS

Radeon RX 6600 XT

Graphics Card

Mar 2011

Release Date

Jul 2021

Northern Islands

Generation

Navi II

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 4.0 x8

Clock Speeds

-

Base Clock

1968 MHz

-

Boost Clock

2589 MHz

1250 MHz

Memory Clock

2000 MHz

Memory

2GB

Memory Size

8GB

GDDR5

Memory Type

GDDR6

256bit

Memory Bus

128bit

160.0GB/s

Bandwidth

256.0GB/s

Render Config

-

SM Count

-

24

Compute Units

32

1536

Shading Units

2048

96

TMUs

128

32

ROPs

64

-

Tensor Cores

-

RT Cores

32

8 KB (per CU)

L1 Cache

128 KB per Array

512 KB

L2 Cache

2 MB

Theoretical Performance

26.56 GPixel/s

Pixel Rate

165.7 GPixel/s

79.68 GTexel/s

Texture Rate

331.4 GTexel/s

-

FP16 (half)

21.21 TFLOPS

2.550 TFLOPS

FP32 (float)

10.60 TFLOPS

637.4 GFLOPS

FP64 (double)

662.8 GFLOPS

Graphics Processor

Antilles

GPU Name

Navi 23

Antilles XT (215-0807027)

GPU Variant

Navi 23 XT (215-130000006)

TeraScale 3

Architecture

RDNA 2.0

TSMC

Foundry

TSMC

40 nm

Process Size

7 nm

2.64 billion

Transistors

11.06 billion

389 mm²

Die Size

237 mm²

Board Design

375W

TDP

160W

750 W

Suggested PSU

450 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

1x HDMI 2.1 3x DisplayPort 1.4a

2x 8-pin

Power Connectors

1x 8-pin

Graphics Features

11.2 (11_0)

DirectX

12 Ultimate (12_2)

4.4

OpenGL

4.6

1.2

OpenCL

2.1

N/A

Vulkan

1.3

-

CUDA

-

5.0

Shader Model

6.7

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