AMD Radeon RX 7900 XT vs AMD Radeon HD 7870 XT

VS

AMD Radeon RX 7900 XT

AMD Radeon HD 7870 XT

We compared two Desktop platform GPUs: 20GB VRAM Radeon RX 7900 XT and 2GB VRAM Radeon HD 7870 XT to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 7900 XT 's Advantages

Released 10 years late

Boost Clock has increased by 146% (2394MHz vs 975MHz)

More VRAM (20GB vs 2GB)

Larger VRAM bandwidth (800.0GB/s vs 192.0GB/s)

3840 additional rendering cores

AMD Radeon HD 7870 XT 's Advantages

Lower TDP (185W vs 300W)

Score

Benchmark

FP32 (float)

Radeon RX 7900 XT +1618%

51.48 TFLOPS

Radeon HD 7870 XT

2.995 TFLOPS

Radeon RX 7900 XT

VS

Radeon HD 7870 XT

Graphics Card

Nov 2022

Release Date

Nov 2012

Navi III

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

1387 MHz

Base Clock

925 MHz

2394 MHz

Boost Clock

975 MHz

2500 MHz

Memory Clock

1500 MHz

Memory

20GB

Memory Size

2GB

GDDR6

Memory Type

GDDR5

320bit

Memory Bus

256bit

800.0GB/s

Bandwidth

192.0GB/s

Render Config

84

Compute Units

24

-

5376

Shading Units

1536

336

TMUs

96

192

ROPs

32

-

84

RT Cores

-

256 KB per Array

L1 Cache

16 KB (per CU)

6 MB

L2 Cache

512 KB

80 MB

L3 Cache

-

Theoretical Performance

459.6 GPixel/s

Pixel Rate

31.20 GPixel/s

804.4 GTexel/s

Texture Rate

93.60 GTexel/s

103.0 TFLOPS

FP16 (half)

-

51.48 TFLOPS

FP32 (float)

2.995 TFLOPS

1.609 TFLOPS

FP64 (double)

748.8 GFLOPS

Board Design

300W

TDP

185W

700 W

Suggested PSU

450 W

1x HDMI 2.1a 2x DisplayPort 2.1 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 31

GPU Name

Tahiti

Navi 31 XT (215-145000156)

GPU Variant

Tahiti LE (215-0821122)

RDNA 3.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

5 nm

Process Size

28 nm

57.7 billion

Transistors

4.313 billion

529 mm²

Die Size

352 mm²

Graphics Features

12 Ultimate (12_2)

DirectX

12 (11_1)

4.6

OpenGL

4.6

2.2

OpenCL

1.2

1.3

Vulkan

1.2

-

6.7

Shader Model

5.1

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