AMD Radeon RX 6600 vs AMD Radeon R9 390

VS

We compared two Desktop platform GPUs: 8GB VRAM Radeon RX 6600 and 8GB VRAM Radeon R9 390 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6600 's Advantages

Released 6 years and 4 months late

Boost Clock2491MHz

Lower TDP (132W vs 275W)

AMD Radeon R9 390 's Advantages

Larger VRAM bandwidth (384.0GB/s vs 224.0GB/s)

768 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon RX 6600 +74%

8.928 TFLOPS

Radeon R9 390

5.12 TFLOPS

3DMark Time Spy

Radeon RX 6600 +104%

8083

Radeon R9 390

3955

Radeon RX 6600

VS

Radeon R9 390

Graphics Card

Oct 2021

Release Date

Jun 2015

Navi II

Generation

Pirate Islands

Desktop

Type

Desktop

PCIe 4.0 x8

Bus Interface

PCIe 3.0 x16

Clock Speeds

1626 MHz

Base Clock

-

2491 MHz

Boost Clock

-

1750 MHz

Memory Clock

1500 MHz

Memory

8GB

Memory Size

8GB

GDDR6

Memory Type

GDDR5

128bit

Memory Bus

512bit

224.0GB/s

Bandwidth

384.0GB/s

Render Config

-

SM Count

-

28

Compute Units

40

1792

Shading Units

2560

112

TMUs

160

64

ROPs

64

-

Tensor Cores

-

28

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per CU)

2 MB

L2 Cache

1024 KB

Theoretical Performance

159.4 GPixel/s

Pixel Rate

64.00 GPixel/s

279.0 GTexel/s

Texture Rate

160.0 GTexel/s

17.86 TFLOPS

FP16 (half)

-

8.928 TFLOPS

FP32 (float)

5.120 TFLOPS

558.0 GFLOPS

FP64 (double)

640.0 GFLOPS

Graphics Processor

Navi 23

GPU Name

Grenada

Navi 23 XL (215-130000016)

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

Board Design

132W

TDP

275W

300 W

Suggested PSU

600 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

1x 6-pin + 1x 8-pin

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

-

CUDA

-

6.5

Shader Model

6.3

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