AMD Radeon RX 6600 XT vs AMD Radeon R9 390 X2

VS

AMD Radeon RX 6600 XT

AMD Radeon R9 390 X2

We compared two Desktop platform GPUs: 8GB VRAM Radeon RX 6600 XT and 8GB VRAM Radeon R9 390 X2 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 5 years and 10 months late

Boost Clock2589MHz

Lower TDP (160W vs 580W)

AMD Radeon R9 390 X2 's Advantages

Larger VRAM bandwidth (345.6GB/s vs 256.0GB/s)

512 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon RX 6600 XT +107%

10.6 TFLOPS

Radeon R9 390 X2

5.12 TFLOPS

Radeon RX 6600 XT

VS

Radeon R9 390 X2

Graphics Card

Jul 2021

Release Date

Sep 2015

Navi II

Generation

Pirate Islands

Desktop

Type

Desktop

PCIe 4.0 x8

Bus Interface

PCIe 3.0 x16

Clock Speeds

1968 MHz

Base Clock

-

2589 MHz

Boost Clock

-

2000 MHz

Memory Clock

1350 MHz

Memory

8GB

Memory Size

8GB

GDDR6

Memory Type

GDDR5

128bit

Memory Bus

512bit

256.0GB/s

Bandwidth

345.6GB/s

Render Config

32

Compute Units

40

-

2048

Shading Units

2560

128

TMUs

160

64

ROPs

64

-

32

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per CU)

2 MB

L2 Cache

1024 KB

32 MB

L3 Cache

-

Theoretical Performance

165.7 GPixel/s

Pixel Rate

64.00 GPixel/s

331.4 GTexel/s

Texture Rate

160.0 GTexel/s

21.21 TFLOPS

FP16 (half)

-

10.60 TFLOPS

FP32 (float)

5.120 TFLOPS

662.8 GFLOPS

FP64 (double)

640.0 GFLOPS

Board Design

160W

TDP

580W

450 W

Suggested PSU

950 W

1x HDMI 2.1 3x DisplayPort 1.4a

Outputs

2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2

1x 8-pin

Power Connectors

4x 8-pin

Graphics Processor

Navi 23

GPU Name

Grenada

Navi 23 XT (215-130000006)

GPU Variant

Grenada PRO (215-0880030)

RDNA 2.0

Architecture

GCN 2.0

TSMC

Foundry

TSMC

7 nm

Process Size

28 nm

11.06 billion

Transistors

6.2 billion

237 mm²

Die Size

438 mm²

Graphics Features

12 Ultimate (12_2)

DirectX

12 (12_0)

4.6

OpenGL

4.6

2.1

OpenCL

2.0

1.3

Vulkan

1.2

-

6.7

Shader Model

6.3

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