AMD Radeon HD 7970 vs AMD Radeon HD 7850

VS

AMD Radeon HD 7970

AMD Radeon HD 7850

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7970 and 2GB VRAM Radeon HD 7850 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7970 's Advantages

More VRAM (3GB vs 2GB)

Larger VRAM bandwidth (264.0GB/s vs 153.6GB/s)

1024 additional rendering cores

AMD Radeon HD 7850 's Advantages

Lower TDP (130W vs 250W)

Score

Benchmark

FP32 (float)

Radeon HD 7970 +115%

3.789 TFLOPS

Radeon HD 7850

1.761 TFLOPS

3DMark Time Spy

Radeon HD 7970 +73%

2279

Radeon HD 7850

1312

Radeon HD 7970

VS

Radeon HD 7850

Graphics Card

Dec 2011

Release Date

Mar 2012

Southern Islands

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

1375 MHz

Memory Clock

1200 MHz

Memory

3GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

256bit

264.0GB/s

Bandwidth

153.6GB/s

Render Config

32

Compute Units

16

-

2048

Shading Units

1024

128

TMUs

64

32

ROPs

32

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

768 KB

L2 Cache

512 KB

-

Theoretical Performance

29.60 GPixel/s

Pixel Rate

27.52 GPixel/s

118.4 GTexel/s

Texture Rate

55.04 GTexel/s

-

3.789 TFLOPS

FP32 (float)

1.761 TFLOPS

947.2 GFLOPS

FP64 (double)

110.1 GFLOPS

Board Design

250W

TDP

130W

600 W

Suggested PSU

300 W

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

Outputs

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

1x 6-pin + 1x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

Tahiti

GPU Name

Pitcairn

Tahiti XT (215-0821060)

GPU Variant

Pitcairn PRO (215-0828062)

GCN 1.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

4.313 billion

Transistors

2.8 billion

352 mm²

Die Size

212 mm²

Graphics Features

12 (11_1)

DirectX

12 (11_1)

4.6

OpenGL

4.6

1.2

OpenCL

1.2

Vulkan

1.2

-

5.1

Shader Model

5.1

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