AMD Radeon HD 7990 vs ATI Radeon HD 3870 X2

VS

AMD Radeon HD 7990

ATI Radeon HD 3870 X2

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7990 and 512MB VRAM Radeon HD 3870 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 5 years and 3 months late

Boost Clock1000MHz

More VRAM (3GB vs 512GB)

Larger VRAM bandwidth (288.0GB/s vs 57.66GB/s)

1728 additional rendering cores

ATI Radeon HD 3870 X2 's Advantages

Lower TDP (165W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 7990 +675%

4.096 TFLOPS

Radeon HD 3870 X2

0.528 TFLOPS

Radeon HD 7990

VS

Radeon HD 3870 X2

Graphics Card

Apr 2013

Release Date

Jan 2008

Southern Islands

Generation

Radeon R600

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

901 MHz

Memory

3GB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

384bit

Memory Bus

256bit

288.0GB/s

Bandwidth

57.66GB/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

32.00 GPixel/s

Pixel Rate

13.20 GPixel/s

128.0 GTexel/s

Texture Rate

13.20 GTexel/s

-

4.096 TFLOPS

FP32 (float)

528.0 GFLOPS

1024 GFLOPS

FP64 (double)

105.6 GFLOPS

Board Design

375W

TDP

165W

750 W

Suggested PSU

450 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

R680

Malta XT (215-0849026)

GPU Variant

R680 XT (215-0708017)

GCN 1.0

Architecture

TeraScale

TSMC

Foundry

TSMC

28 nm

Process Size

55 nm

4.313 billion

Transistors

0.666 billion

365 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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