AMD Radeon RX 6800 XT vs AMD Radeon R9 390X

VS

AMD Radeon RX 6800 XT

AMD Radeon R9 390X

We compared two Desktop platform GPUs: 16GB VRAM Radeon RX 6800 XT and 8GB VRAM Radeon R9 390X to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6800 XT 's Advantages

Released 5 years and 4 months late

Boost Clock2250MHz

More VRAM (16GB vs 8GB)

Larger VRAM bandwidth (512.0GB/s vs 384.0GB/s)

1792 additional rendering cores

AMD Radeon R9 390X 's Advantages

Lower TDP (275W vs 300W)

Score

Benchmark

FP32 (float)

Radeon RX 6800 XT +250%

20.74 TFLOPS

Radeon R9 390X

5.914 TFLOPS

3DMark Time Spy

Radeon RX 6800 XT +357%

19441

Radeon R9 390X

4245

Radeon RX 6800 XT

VS

Radeon R9 390X

Graphics Card

Oct 2020

Release Date

Jun 2015

Navi II

Generation

Pirate Islands

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

1825 MHz

Base Clock

-

2250 MHz

Boost Clock

-

2000 MHz

Memory Clock

1500 MHz

Memory

16GB

Memory Size

8GB

GDDR6

Memory Type

GDDR5

256bit

Memory Bus

512bit

512.0GB/s

Bandwidth

384.0GB/s

Render Config

72

Compute Units

44

-

4608

Shading Units

2816

288

TMUs

176

128

ROPs

64

-

72

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per CU)

4 MB

L2 Cache

1024 KB

128 MB

L3 Cache

-

Theoretical Performance

288.0 GPixel/s

Pixel Rate

67.20 GPixel/s

648.0 GTexel/s

Texture Rate

184.8 GTexel/s

41.47 TFLOPS

FP16 (half)

-

20.74 TFLOPS

FP32 (float)

5.914 TFLOPS

1296 GFLOPS

FP64 (double)

739.2 GFLOPS

Board Design

300W

TDP

275W

700 W

Suggested PSU

600 W

1x HDMI 2.1 2x DisplayPort 1.4a 1x USB Type-C

Outputs

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

2x 8-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

Navi 21

GPU Name

Grenada

Navi 21 XT (215-121000177)

GPU Variant

Grenada XT (215-0880004)

RDNA 2.0

Architecture

GCN 2.0

TSMC

Foundry

TSMC

7 nm

Process Size

28 nm

26.8 billion

Transistors

6.2 billion

520 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

-

6.5

Shader Model

6.3

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