AMD Radeon HD 7970 vs ATI Radeon HD 3850 X3

VS

AMD Radeon HD 7970

ATI Radeon HD 3850 X3

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7970 and 512MB VRAM Radeon HD 3850 X3 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 512GB)

Larger VRAM bandwidth (264.0GB/s vs 54.40GB/s)

1728 additional rendering cores

ATI Radeon HD 3850 X3 's Advantages

Lower TDP (145W vs 250W)

Score

Benchmark

FP32 (float)

Radeon HD 7970 +785%

3.789 TFLOPS

Radeon HD 3850 X3

0.428 TFLOPS

Radeon HD 7970

VS

Radeon HD 3850 X3

Graphics Card

Dec 2011

Release Date

Unknown

Southern Islands

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1375 MHz

Memory Clock

850 MHz

Memory

3GB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

384bit

Memory Bus

256bit

264.0GB/s

Bandwidth

54.40GB/s

Render Config

32

Compute Units

4

-

2048

Shading Units

320

128

TMUs

16

32

ROPs

16

-

16 KB (per CU)

L1 Cache

-

768 KB

L2 Cache

256 KB

-

Theoretical Performance

29.60 GPixel/s

Pixel Rate

10.70 GPixel/s

118.4 GTexel/s

Texture Rate

10.70 GTexel/s

-

3.789 TFLOPS

FP32 (float)

428.2 GFLOPS

947.2 GFLOPS

FP64 (double)

-

Board Design

250W

TDP

145W

600 W

Suggested PSU

300 W

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

Outputs

4x DVI

1x 6-pin + 1x 8-pin

Power Connectors

1x 8-pin

Graphics Processor

Tahiti

GPU Name

RV670

Tahiti XT (215-0821060)

GPU Variant

RV670 PRO (215-0708003)

GCN 1.0

Architecture

TeraScale

TSMC

Foundry

TSMC

28 nm

Process Size

55 nm

4.313 billion

Transistors

0.666 billion

352 mm²

Die Size

192 mm²

Graphics Features

12 (11_1)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3 (full) 4.0 (partial)

1.2

OpenCL

N/A

1.2

Vulkan

N/A

-

5.1

Shader Model

4.1

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