AMD Radeon HD 6790 vs ATI Radeon HD 4870 Mac Edition

VS

AMD Radeon HD 6790

ATI Radeon HD 4870 Mac Edition

We compared two Desktop platform GPUs: 1024MB VRAM Radeon HD 6790 and 512MB VRAM Radeon HD 4870 Mac Edition to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6790 's Advantages

Released 2 years and 3 months late

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (134.4GB/s vs 108.8GB/s)

Score

Benchmark

FP32 (float)

Radeon HD 6790 +12%

1.344 TFLOPS

Radeon HD 4870 Mac Edition

1.2 TFLOPS

Radeon HD 6790

VS

Radeon HD 4870 Mac Edition

Graphics Card

Apr 2011

Release Date

Jan 2009

Northern Islands

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1050 MHz

Memory Clock

850 MHz

Memory

1024MB

Memory Size

512MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

134.4GB/s

Bandwidth

108.8GB/s

Render Config

10

Compute Units

10

-

800

Shading Units

800

40

TMUs

40

16

ROPs

16

-

8 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

256 KB

-

Theoretical Performance

13.44 GPixel/s

Pixel Rate

12.00 GPixel/s

33.60 GTexel/s

Texture Rate

30.00 GTexel/s

-

1344 GFLOPS

FP32 (float)

1200 GFLOPS

-

FP64 (double)

240.0 GFLOPS

Board Design

150W

TDP

150W

450 W

Suggested PSU

450 W

2x DVI 1x HDMI 1.3a 1x DisplayPort 1.1

Outputs

1x DVI 1x mini-DisplayPort 1.0

2x 6-pin

Power Connectors

2x 6-pin

Graphics Processor

Barts

GPU Name

RV770

Barts LE (215-0798002)

GPU Variant

RV770 XT Mac (215-0669080)

TeraScale 2

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

55 nm

1.7 billion

Transistors

0.956 billion

255 mm²

Die Size

256 mm²

Graphics Features

11.2 (11_0)

DirectX

10.1 (10_1)

4.4

OpenGL

3.3

1.2

OpenCL

1.1

N/A

Vulkan

N/A

-

5.0

Shader Model

4.1

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