AMD Radeon HD 7990 vs AMD Radeon RX 6800

VS

AMD Radeon HD 7990

AMD Radeon RX 6800

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7990 and 16GB VRAM Radeon RX 6800 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6800 's Advantages

Released 7 years and 6 months late

Boost Clock has increased by 110% (2105MHz vs 1000MHz)

More VRAM (16GB vs 3GB)

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

1792 additional rendering cores

Lower TDP (250W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 7990

4.096 TFLOPS

Radeon RX 6800 +294%

16.17 TFLOPS

Radeon HD 7990

VS

Radeon RX 6800

Graphics Card

Apr 2013

Release Date

Oct 2020

Southern Islands

Generation

Navi II

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 4.0 x16

Clock Speeds

950 MHz

Base Clock

1700 MHz

1000 MHz

Boost Clock

2105 MHz

1500 MHz

Memory Clock

2000 MHz

Memory

3GB

Memory Size

16GB

GDDR5

Memory Type

GDDR6

384bit

Memory Bus

256bit

288.0GB/s

Bandwidth

512.0GB/s

Render Config

32

Compute Units

60

-

2048

Shading Units

3840

128

TMUs

240

32

ROPs

96

-

RT Cores

60

16 KB (per CU)

L1 Cache

128 KB per Array

768 KB

L2 Cache

4 MB

-

L3 Cache

128 MB

Theoretical Performance

32.00 GPixel/s

Pixel Rate

202.1 GPixel/s

128.0 GTexel/s

Texture Rate

505.2 GTexel/s

-

FP16 (half)

32.33 TFLOPS

4.096 TFLOPS

FP32 (float)

16.17 TFLOPS

1024 GFLOPS

FP64 (double)

1010 GFLOPS

Board Design

375W

TDP

250W

750 W

Suggested PSU

600 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

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

2x 8-pin

Power Connectors

2x 8-pin

Graphics Processor

Malta

GPU Name

Navi 21

Malta XT (215-0849026)

GPU Variant

Navi 21 XL (215-121000187)

GCN 1.0

Architecture

RDNA 2.0

TSMC

Foundry

TSMC

28 nm

Process Size

7 nm

4.313 billion

Transistors

26.8 billion

365 mm²

Die Size

520 mm²

Graphics Features

12 (11_1)

DirectX

12 Ultimate (12_2)

4.6

OpenGL

4.6

1.2

OpenCL

2.1

1.2

Vulkan

1.3

-

5.1

Shader Model

6.5

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