AMD Radeon HD 6990 vs AMD Radeon RX 6800 XT

VS

AMD Radeon HD 6990

AMD Radeon RX 6800 XT

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 16GB VRAM Radeon RX 6800 XT 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 9 years and 7 months late

Boost Clock2250MHz

More VRAM (16GB vs 2GB)

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

3072 additional rendering cores

Lower TDP (300W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990

2.55 TFLOPS

Radeon RX 6800 XT +713%

20.74 TFLOPS

Radeon HD 6990

VS

Radeon RX 6800 XT

Graphics Card

Mar 2011

Release Date

Oct 2020

Northern Islands

Generation

Navi II

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 4.0 x16

Clock Speeds

-

Base Clock

1825 MHz

-

Boost Clock

2250 MHz

1250 MHz

Memory Clock

2000 MHz

Memory

2GB

Memory Size

16GB

GDDR5

Memory Type

GDDR6

256bit

Memory Bus

256bit

160.0GB/s

Bandwidth

512.0GB/s

Render Config

24

Compute Units

72

-

1536

Shading Units

4608

96

TMUs

288

32

ROPs

128

-

RT Cores

72

8 KB (per CU)

L1 Cache

128 KB per Array

512 KB

L2 Cache

4 MB

-

L3 Cache

128 MB

Theoretical Performance

26.56 GPixel/s

Pixel Rate

288.0 GPixel/s

79.68 GTexel/s

Texture Rate

648.0 GTexel/s

-

FP16 (half)

41.47 TFLOPS

2.550 TFLOPS

FP32 (float)

20.74 TFLOPS

637.4 GFLOPS

FP64 (double)

1296 GFLOPS

Board Design

375W

TDP

300W

750 W

Suggested PSU

700 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

Antilles

GPU Name

Navi 21

Antilles XT (215-0807027)

GPU Variant

Navi 21 XT (215-121000177)

TeraScale 3

Architecture

RDNA 2.0

TSMC

Foundry

TSMC

40 nm

Process Size

7 nm

2.64 billion

Transistors

26.8 billion

389 mm²

Die Size

520 mm²

Graphics Features

11.2 (11_0)

DirectX

12 Ultimate (12_2)

4.4

OpenGL

4.6

1.2

OpenCL

2.1

N/A

Vulkan

1.3

-

5.0

Shader Model

6.5

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