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ATI Radeon HD 3870

RV670
Graphics Processor
320
Cores
16
TMUs
16
ROPs
512 MB
Memory Size
GDDR4
Memory Type
256 bit
Bus Width
ATI Radeon HD 3870 Photo ATI RV670 Photo
The Radeon HD 3870 was a performance graphics card by ATI, launched in November 2007. Built on the 55 nm process, and based on the RV670 graphics processor, in its RV670 XT variant, the card supports DirectX 10.0. The RV670 graphics processor is an average sized chip with a die area of 192 mm² and 666 million transistors. It features 320 shading units, 16 texture mapping units and 16 ROPs. ATI has placed 512 MB GDDR4 memory on the card, which are connected using a 256-bit memory interface. The GPU is operating at a frequency of 777 MHz, memory is running at 1126 MHz.
Being a dual-slot card, the ATI Radeon HD 3870 draws power from 1x 6-pin power connectors, with power draw rated at 106 W maximum. Display outputs include: 2x DVI, 1x S-Video. Radeon HD 3870 is connected to the rest of the system using a PCI-Express 2.0 x16 interface. The card measures 241 mm in length, and features a dual-slot cooling solution. Its price at launch was 269 US Dollars.

Graphics Processor

GPU Name
RV670
GPU Variant
RV670 XT
(215-0708005)
Architecture
TeraScale
Foundry
TSMC
Process Size
55 nm
Transistors
666 million
Die Size
192 mm²

Graphics Card

Release Date
Nov 19th, 2007
Generation
Radeon R600
(HD 3800)
Production
End-of-life
Launch Price
269 USD
Bus Interface
PCIe 2.0 x16

Relative Performance

22%
28%
34%
44%
51%
54%
67%
88%
89%
97%
100%
Radeon HD 3870
102%
104%
119%
127%
136%
141%
146%
151%
161%
170%
174%
179%
185%
211%
213%
217%
219%
220%
222%
224%
237%
249%
254%
263%
265%
268%
270%
271%
271%
277%
290%
296%
317%
323%
323%
337%
337%
349%
373%
385%
387%
394%
396%
410%
414%
417%
425%
444%
453%
460%
461%
462%
463%
500%
505%
517%
523%
526%
530%
531%
540%
541%
557%
599%
615%
630%
634%
641%
647%
662%
680%
695%
712%
722%
723%
800%
881%
893%
953%
958%
971%
983%
992%
997%
1011%
1015%
1020%
1029%
1084%
1107%
1121%
1121%
1233%
1254%
1275%
1371%
1506%
1559%
1679%
1679%
1771%
1977%
2072%
2126%
2317%
2636%
Based on TPU review data: "Performance Summary" at 1920x1080
Performance estimated based on architecture, shader count and clocks.

Clock Speeds

GPU Clock
777 MHz
Memory Clock
1126 MHz
2252 MHz effective

Memory

Memory Size
512 MB
Memory Type
GDDR4
Memory Bus
256 bit
Bandwidth
72.06 GB/s

Render Config

Shading Units
320
TMUs
16
ROPs
16
Compute Units
4

Theoretical Performance

Pixel Rate
12.43 GPixel/s
Texture Rate
12.43 GTexel/s
FP32 (float) performance
497.3 GFLOPS
FP64 (double) performance
99.46 GFLOPS (1:5)

Board Design

Slot Width
Dual-slot
Length
9.5 inches
241 mm
TDP
106 W
Outputs
2x DVI
1x S-Video
Power Connectors
1x 6-pin
Board Number
B339

Graphics Features

DirectX
10.0
OpenGL
3.3
OpenCL
N/A
Vulkan
N/A
Shader Model
4.0

RV670 GPU Notes

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

RV670 Chip Numbers:
RV670 XT (215-0708017)

Retail boards based on this design (11)

Name GPU Clock Memory Clock Other Changes
ASUS HD 3870 Magic 777 MHz 855 MHz GDDR3, 9 inches/229 mm, Single-slot
ASUS HD 3870 TOP 851 MHz 1143 MHz 9 inches/229 mm, Single-slot
Diamond Viper HD 3870 Ruby Edition 850 MHz 950 MHz 1024 MB, GDDR3, 9 inches/229 mm
Diamond Viper HD 3870 Ruby Edition 820 MHz 1200 MHz 9 inches/229 mm
HIS HD 3870 IceQ 3 Turbo 850 MHz 1190 MHz 9.49 inches/241 mm
Sapphire HD 3870 777 MHz 1126 MHz
Sapphire HD 3870 Atomic 825 MHz 1200 MHz Single-slot
Sapphire HD 3870 Toxic II 800 MHz 1152 MHz Single-slot
Sapphire HD 3870 Ultimate 800 MHz 1152 MHz Single-slot
Sapphire HD 3870 Vapor-X 800 MHz 1100 MHz 1024 MB, Single-slot
VisionTek HD 3870 777 MHz 1126 MHz GDDR3, Single-slot