AMD Radeon RX 6800 XT vs ATI Radeon HD 3870 AGP

VS

AMD Radeon RX 6800 XT

ATI Radeon HD 3870 AGP

We compared two Desktop platform GPUs: 16GB VRAM Radeon RX 6800 XT and 512MB VRAM Radeon HD 3870 AGP to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6800 XT 's Advantages

Boost Clock2250MHz

More VRAM (16GB vs 512GB)

Larger VRAM bandwidth (512.0GB/s vs 72.06GB/s)

4288 additional rendering cores

ATI Radeon HD 3870 AGP 's Advantages

Lower TDP (106W vs 300W)

Score

Benchmark

FP32 (float)

Radeon RX 6800 XT +4073%

20.74 TFLOPS

Radeon HD 3870 AGP

0.497 TFLOPS

Radeon RX 6800 XT

VS

Radeon HD 3870 AGP

Graphics Card

Oct 2020

Release Date

Unknown

Navi II

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

AGP 8x

Clock Speeds

1825 MHz

Base Clock

-

2250 MHz

Boost Clock

-

2000 MHz

Memory Clock

1126 MHz

Memory

16GB

Memory Size

512MB

GDDR6

Memory Type

GDDR4

256bit

Memory Bus

256bit

512.0GB/s

Bandwidth

72.06GB/s

Render Config

72

Compute Units

4

-

4608

Shading Units

320

288

TMUs

16

128

ROPs

16

-

72

RT Cores

-

128 KB per Array

L1 Cache

-

4 MB

L2 Cache

256 KB

128 MB

L3 Cache

-

Theoretical Performance

288.0 GPixel/s

Pixel Rate

12.43 GPixel/s

648.0 GTexel/s

Texture Rate

12.43 GTexel/s

41.47 TFLOPS

FP16 (half)

-

20.74 TFLOPS

FP32 (float)

497.3 GFLOPS

1296 GFLOPS

FP64 (double)

99.46 GFLOPS

Board Design

300W

TDP

106W

700 W

Suggested PSU

300 W

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

Outputs

2x DVI 1x S-Video

2x 8-pin

Power Connectors

1x 8-pin

Graphics Processor

Navi 21

GPU Name

RV670

Navi 21 XT (215-121000177)

GPU Variant

RV670 XT (215-0708005)

RDNA 2.0

Architecture

TeraScale

TSMC

Foundry

TSMC

7 nm

Process Size

55 nm

26.8 billion

Transistors

0.666 billion

520 mm²

Die Size

192 mm²

Graphics Features

12 Ultimate (12_2)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3 (full) 4.0 (partial)

2.1

OpenCL

N/A

1.3

Vulkan

N/A

-

6.5

Shader Model

4.1

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