AMD Radeon R9 390X vs AMD Radeon RX 6900 XT

VS

AMD Radeon R9 390X

AMD Radeon RX 6900 XT

We compared two Desktop platform GPUs: 8GB VRAM Radeon R9 390X and 16GB VRAM Radeon RX 6900 XT to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 390X 's Advantages

Lower TDP (275W vs 300W)

AMD Radeon RX 6900 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)

2304 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon R9 390X

5.914 TFLOPS

Radeon RX 6900 XT +289%

23.04 TFLOPS

3DMark Time Spy

Radeon R9 390X

4245

Radeon RX 6900 XT +393%

20932

Radeon R9 390X

VS

Radeon RX 6900 XT

Graphics Card

Jun 2015

Release Date

Oct 2020

Pirate Islands

Generation

Navi II

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 4.0 x16

Clock Speeds

-

Base Clock

1825 MHz

-

Boost Clock

2250 MHz

1500 MHz

Memory Clock

2000 MHz

Memory

8GB

Memory Size

16GB

GDDR5

Memory Type

GDDR6

512bit

Memory Bus

256bit

384.0GB/s

Bandwidth

512.0GB/s

Render Config

44

Compute Units

80

-

2816

Shading Units

5120

176

TMUs

320

64

ROPs

128

-

RT Cores

80

16 KB (per CU)

L1 Cache

128 KB per Array

1024 KB

L2 Cache

4 MB

-

L3 Cache

128 MB

Theoretical Performance

67.20 GPixel/s

Pixel Rate

288.0 GPixel/s

184.8 GTexel/s

Texture Rate

720.0 GTexel/s

-

FP16 (half)

46.08 TFLOPS

5.914 TFLOPS

FP32 (float)

23.04 TFLOPS

739.2 GFLOPS

FP64 (double)

1440 GFLOPS

Board Design

275W

TDP

300W

600 W

Suggested PSU

700 W

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

Outputs

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

1x 6-pin + 1x 8-pin

Power Connectors

2x 8-pin

Graphics Processor

Grenada

GPU Name

Navi 21

Grenada XT (215-0880004)

GPU Variant

Navi 21 XTX (215-121000167)

GCN 2.0

Architecture

RDNA 2.0

TSMC

Foundry

TSMC

28 nm

Process Size

7 nm

6.2 billion

Transistors

26.8 billion

438 mm²

Die Size

520 mm²

Graphics Features

12 (12_0)

DirectX

12 Ultimate (12_2)

4.6

OpenGL

4.6

2.0

OpenCL

2.1

1.2

Vulkan

1.3

-

6.3

Shader Model

6.5

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