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ATI Radeon HD 3870 X2

R680
Graphics Processor
320 x2
Cores
16 x2
TMUs
16 x2
ROPs
512 MB x2
Memory Size
GDDR3
Memory Type
256 bit x2
Bus Width
ATI Radeon HD 3870 X2 Image ATI R680 Image
The Radeon HD 3870 X2 was a high-end graphics card by ATI, launched in January 2008. Built on the 55 nm process, and based on the R680 graphics processor, the card supports DirectX 10.1. The R680 graphics processor is an average sized chip with a die area of 192 mm² and 666 million transistors. Radeon HD 3870 X2 combines two graphics processors to increase performance. It features 320 shading units, 16 texture mapping units and 16 ROPs per GPU. ATI has placed 1,024 MB GDDR3 memory on the card, which are connected using a 256-bit memory interface per GPU (each GPU manages 512 MB). The GPU is operating at a frequency of 825 MHz, memory is running at 901 MHz.
We recommend the ATI Radeon HD 3870 X2 for gaming with highest details at resolutions up to, and including, 1920x1080.
Being a dual-slot card, the ATI Radeon HD 3870 X2 draws power from 1x 6-pin + 1x 8-pin power connectors, with power draw rated at 165 W maximum. Display outputs include: 2x DVI, 1x S-Video. Radeon HD 3870 X2 is connected to the rest of the system using a PCIe 2.0 x16 interface. The card measures 267 mm in length, and features a dual-slot cooling solution. Its price at launch was 449 US Dollars.

Graphics Processor

GPU Name: R680
Architecture: TeraScale
Process Size: 55 nm
Transistors: 666 million
Die Size: 192 mm²

Graphics Card

Released: Jan 26th, 2008
Production Status: End-of-life
Launch Price: 449 USD
Bus Interface: PCIe 2.0 x16

Relative Performance

20%
26%
32%
41%
48%
51%
63%
83%
84%
91%
96%
98%
100%
Radeon HD 3870 X2
112%
119%
128%
132%
138%
142%
152%
160%
164%
168%
174%
199%
201%
204%
207%
209%
211%
223%
235%
239%
248%
254%
255%
256%
261%
273%
278%
299%
304%
304%
318%
329%
351%
362%
364%
371%
373%
386%
390%
393%
400%
419%
427%
434%
435%
436%
471%
475%
487%
493%
495%
500%
509%
510%
524%
564%
579%
594%
597%
603%
610%
640%
655%
671%
680%
681%
754%
841%
897%
902%
914%
926%
939%
943%
952%
956%
969%
1042%
1056%
1056%
1094%
1195%
1248%
1291%
1414%
1668%
1952%
2011%
Based on TPU review data: "Performance Summary" at 1920x1080
Radeon HD 3870 X2 performance estimated based on architecture, shader count and clocks.

Clock Speeds

GPU Clock: 825 MHz
Memory Clock: 901 MHz
1802 MHz effective

Memory

Memory Size: 512 MB x2
Memory Type: GDDR3
Memory Bus: 256 bit x2
Bandwidth: 57.7 GB/s x2

Render Config

Shading Units: 320 x2
TMUs: 16 x2
ROPs: 16 x2
Compute Units: 4 x2
Pixel Rate: 13.20 GPixel/s x2
Texture Rate: 13.20 GTexel/s x2
Floating-point performance: 528.0 GFLOPS x2

Board Design

Slot Width: Dual-slot
Length: 10.5 inches
267 mm
TDP: 165 W
Outputs: 2x DVI
1x S-Video
Power Connectors: 1x 6-pin + 1x 8-pin
Board Number: B400

Graphics Features

DirectX: 10.1
OpenGL: 3.3
OpenCL: 1.0
Shader Model: 4.1

Reviews

Our review database contains 72 reviews of the Radeon HD 3870 X2.

Retail boards based on this design

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 10.63 inches/270 mm, Single-slot