ASUS ROG HD 3870 X2 TOP

EAH3870X2-TOP/G/3DHTI/1G

Graphics Processor

R680 x2

Cores

320 x2

TMUs

16 x2

ROPs

16 x2

Memory Size

512 MB x2

Memory Type

GDDR3

Bus Width

256 bit x2

GPU

Graphics Processor

GPU Name: R680

GPU Variant: R680 XT
(215-0708017)

Architecture: TeraScale

Foundry: TSMC

Process Size: 55 nm

Transistors: 666 million

Density: 3.5M / mm²

Die Size: 192 mm²

Graphics Card

Release Date: Jan 26th, 2008

Generation: Radeon R600
(HD 3800)

Predecessor: Radeon R500 PCIe

Successor: Radeon R700

Production: End-of-life

Bus Interface: PCIe 2.0 x16

Clock Speeds

GPU Clock: ~~825 MHz~~
851 MHz (+3%)

Memory Clock: ~~901 MHz~~
954 MHz (+6%)
~~1802 Mbps effective~~
1908 Mbps effective

Memory

Memory Size: 512 MB

Memory Type: GDDR3

Memory Bus: 256 bit

Bandwidth: ~~57.66 GB/s~~
61.06 GB/s

Render Config

Shading Units: 320

TMUs: 16

ROPs: 16

Compute Units: 4

L2 Cache: 256 KB

Theoretical Performance

Pixel Rate: ~~13.20 GPixel/s~~
13.62 GPixel/s

Texture Rate: ~~13.20 GTexel/s~~
13.62 GTexel/s

FP32 (float): ~~528.0 GFLOPS~~
544.6 GFLOPS

FP64 (double): ~~105.6 GFLOPS~~
108.9 GFLOPS (1:5)

Board Design

Slot Width: Dual-slot

TDP: 165 W

Suggested PSU: 450 W

Outputs: 2x DVI
1x S-Video
4x DVI
1x S-Video

Power Connectors: 1x 6-pin + 1x 8-pin

Board Number: 109-B40031-10

Graphics Features

DirectX: 10.1 (10_1)

OpenGL: 3.3 (full)
4.0 (partial)

OpenCL: N/A

Vulkan: N/A

Shader Model: 4.1

R680 GPU Notes

Graphics/Compute: GFX3
Display Core Engine: 2.0
Unified Video Decoder: 1.0

Latest Drivers:
Windows XP / 8:
Catalyst Software Suite 13.1 / 13.4 Beta

Windows Vista / 7:
Catalyst Software Suite 13.9

Other retail boards based on this design (3)

Name	GPU Clock	Memory Clock	Other Changes
ASUS ROG HD 3870 X2 TOP	851 MHz	954 MHz	4x DVI 1x S-Video
PowerColor HD 3870 X2 GDDR4	825 MHz	1125 MHz	GDDR4, 3x DVI 1x HDMI 1x S-Video
Sapphire HD 3870 X2 ATOMIC	860 MHz	931 MHz	Single-slot