AMD Radeon HD 7990 vs ATI Radeon HD 4870 X2

VS

AMD Radeon HD 7990

ATI Radeon HD 4870 X2

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7990 and 1024MB VRAM Radeon HD 4870 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7990 's Advantages

Released 4 years and 8 months late

Boost Clock1000MHz

More VRAM (3GB vs 1024GB)

Larger VRAM bandwidth (288.0GB/s vs 115.2GB/s)

1248 additional rendering cores

ATI Radeon HD 4870 X2 's Advantages

Lower TDP (286W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 7990 +241%

4.096 TFLOPS

Radeon HD 4870 X2

1.2 TFLOPS

Radeon HD 7990

VS

Radeon HD 4870 X2

Graphics Card

Apr 2013

Release Date

Aug 2008

Southern Islands

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

950 MHz

Base Clock

-

1000 MHz

Boost Clock

-

1500 MHz

Memory Clock

900 MHz

Memory

3GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

256bit

288.0GB/s

Bandwidth

115.2GB/s

Render Config

32

Compute Units

10

-

2048

Shading Units

800

128

TMUs

40

32

ROPs

16

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

768 KB

L2 Cache

256 KB

-

Theoretical Performance

32.00 GPixel/s

Pixel Rate

12.00 GPixel/s

128.0 GTexel/s

Texture Rate

30.00 GTexel/s

-

4.096 TFLOPS

FP32 (float)

1200 GFLOPS

1024 GFLOPS

FP64 (double)

240.0 GFLOPS

Board Design

375W

TDP

286W

750 W

Suggested PSU

600 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

2x DVI 1x S-Video

2x 8-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

Malta

GPU Name

R700

Malta XT (215-0849026)

GPU Variant

R700 XT (215-0669045)

GCN 1.0

Architecture

TeraScale

TSMC

Foundry

TSMC

28 nm

Process Size

55 nm

4.313 billion

Transistors

0.956 billion

365 mm²

Die Size

256 mm²

Graphics Features

12 (11_1)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3

1.2

OpenCL

1.1

1.2

Vulkan

N/A

-

5.1

Shader Model

4.1

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