AMD Radeon RX 6900 XT vs AMD Radeon HD 7990

VS

AMD Radeon RX 6900 XT

AMD Radeon HD 7990

We compared two Desktop platform GPUs: 16GB VRAM Radeon RX 6900 XT and 3GB VRAM Radeon HD 7990 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6900 XT 's Advantages

Released 7 years and 6 months late

Boost Clock has increased by 125% (2250MHz vs 1000MHz)

More VRAM (16GB vs 3GB)

Larger VRAM bandwidth (512.0GB/s vs 288.0GB/s)

3072 additional rendering cores

Lower TDP (300W vs 375W)

Score

Benchmark

FP32 (float)

Radeon RX 6900 XT +462%

23.04 TFLOPS

Radeon HD 7990

4.096 TFLOPS

Radeon RX 6900 XT

VS

Radeon HD 7990

Graphics Card

Oct 2020

Release Date

Apr 2013

Navi II

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

1825 MHz

Base Clock

950 MHz

2250 MHz

Boost Clock

1000 MHz

2000 MHz

Memory Clock

1500 MHz

Memory

16GB

Memory Size

3GB

GDDR6

Memory Type

GDDR5

256bit

Memory Bus

384bit

512.0GB/s

Bandwidth

288.0GB/s

Render Config

80

Compute Units

32

-

5120

Shading Units

2048

320

TMUs

128

ROPs

32

-

80

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per CU)

4 MB

L2 Cache

768 KB

128 MB

L3 Cache

-

Theoretical Performance

288.0 GPixel/s

Pixel Rate

32.00 GPixel/s

720.0 GTexel/s

Texture Rate

128.0 GTexel/s

46.08 TFLOPS

FP16 (half)

-

23.04 TFLOPS

FP32 (float)

4.096 TFLOPS

1440 GFLOPS

FP64 (double)

1024 GFLOPS

Board Design

300W

TDP

375W

700 W

Suggested PSU

750 W

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

Outputs

1x DVI 4x mini-DisplayPort 1.2

2x 8-pin

Power Connectors

2x 8-pin

Graphics Processor

Navi 21

GPU Name

Malta

Navi 21 XTX (215-121000167)

GPU Variant

Malta XT (215-0849026)

RDNA 2.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

7 nm

Process Size

28 nm

26.8 billion

Transistors

4.313 billion

520 mm²

Die Size

365 mm²

Graphics Features

12 Ultimate (12_2)

DirectX

12 (11_1)

4.6

OpenGL

4.6

2.1

OpenCL

1.2

1.3

Vulkan

1.2

-

6.5

Shader Model

5.1

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