AMD Radeon RX 6800 vs AMD Radeon HD 6990

VS

AMD Radeon RX 6800

AMD Radeon HD 6990

We compared two Desktop platform GPUs: 16GB VRAM Radeon RX 6800 and 2GB VRAM Radeon HD 6990 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6800 's Advantages

Released 9 years and 7 months late

Boost Clock2105MHz

More VRAM (16GB vs 2GB)

Larger VRAM bandwidth (512.0GB/s vs 160.0GB/s)

2304 additional rendering cores

Lower TDP (250W vs 375W)

Score

Benchmark

FP32 (float)

Radeon RX 6800 +534%

16.17 TFLOPS

Radeon HD 6990

2.55 TFLOPS

Radeon RX 6800

VS

Radeon HD 6990

Graphics Card

Oct 2020

Release Date

Mar 2011

Navi II

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

1700 MHz

Base Clock

-

2105 MHz

Boost Clock

-

2000 MHz

Memory Clock

1250 MHz

Memory

16GB

Memory Size

2GB

GDDR6

Memory Type

GDDR5

256bit

Memory Bus

256bit

512.0GB/s

Bandwidth

160.0GB/s

Render Config

60

Compute Units

24

-

3840

Shading Units

1536

240

TMUs

96

ROPs

32

-

60

RT Cores

-

128 KB per Array

L1 Cache

8 KB (per CU)

4 MB

L2 Cache

512 KB

128 MB

L3 Cache

-

Theoretical Performance

202.1 GPixel/s

Pixel Rate

26.56 GPixel/s

505.2 GTexel/s

Texture Rate

79.68 GTexel/s

32.33 TFLOPS

FP16 (half)

-

16.17 TFLOPS

FP32 (float)

2.550 TFLOPS

1010 GFLOPS

FP64 (double)

637.4 GFLOPS

Board Design

250W

TDP

375W

600 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

Antilles

Navi 21 XL (215-121000187)

GPU Variant

Antilles XT (215-0807027)

RDNA 2.0

Architecture

TeraScale 3

TSMC

Foundry

TSMC

7 nm

Process Size

40 nm

26.8 billion

Transistors

2.64 billion

520 mm²

Die Size

389 mm²

Graphics Features

12 Ultimate (12_2)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

2.1

OpenCL

1.2

1.3

Vulkan

N/A

-

6.5

Shader Model

5.0

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