AMD Radeon RX 6900 XT vs AMD Radeon HD 8870 OEM

VS

AMD Radeon RX 6900 XT

AMD Radeon HD 8870 OEM

We compared two Desktop platform GPUs: 16GB VRAM Radeon RX 6900 XT and 2GB VRAM Radeon HD 8870 OEM 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 9 months late

Boost Clock2250MHz

More VRAM (16GB vs 2GB)

Larger VRAM bandwidth (512.0GB/s vs 153.6GB/s)

3840 additional rendering cores

AMD Radeon HD 8870 OEM 's Advantages

Lower TDP (175W vs 300W)

Score

Benchmark

FP32 (float)

Radeon RX 6900 XT +800%

23.04 TFLOPS

Radeon HD 8870 OEM

2.56 TFLOPS

Radeon RX 6900 XT

VS

Radeon HD 8870 OEM

Graphics Card

Oct 2020

Release Date

Jan 2013

Navi II

Generation

Sea Islands

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

1825 MHz

Base Clock

-

2250 MHz

Boost Clock

-

2000 MHz

Memory Clock

1200 MHz

Memory

16GB

Memory Size

2GB

GDDR6

Memory Type

GDDR5

256bit

Memory Bus

256bit

512.0GB/s

Bandwidth

153.6GB/s

Render Config

80

Compute Units

20

-

5120

Shading Units

1280

320

TMUs

80

128

ROPs

32

-

80

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per CU)

4 MB

L2 Cache

512 KB

128 MB

L3 Cache

-

Theoretical Performance

288.0 GPixel/s

Pixel Rate

32.00 GPixel/s

720.0 GTexel/s

Texture Rate

80.00 GTexel/s

46.08 TFLOPS

FP16 (half)

-

23.04 TFLOPS

FP32 (float)

2.560 TFLOPS

1440 GFLOPS

FP64 (double)

160.0 GFLOPS

Board Design

300W

TDP

175W

700 W

Suggested PSU

450 W

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

Outputs

1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2

2x 8-pin

Power Connectors

2x 6-pin

Graphics Processor

Navi 21

GPU Name

Pitcairn

Navi 21 XTX (215-121000167)

GPU Variant

Pitcairn XT (215-0828047)

RDNA 2.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

7 nm

Process Size

28 nm

26.8 billion

Transistors

2.8 billion

520 mm²

Die Size

212 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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