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ATI Radeon HD 4870

RV770
Graphics Processor
800
Cores
40
TMUs
16
ROPs
512 MB
Memory Size
GDDR5
Memory Type
256 bit
Bus Width
ATI Radeon HD 4870 Photo ATI RV770 Photo
The Radeon HD 4870 was a performance graphics card by ATI, launched in June 2008. Built on the 55 nm process, and based on the RV770 graphics processor, in its RV770 XT variant, the card supports DirectX 10.1. The RV770 graphics processor is an average sized chip with a die area of 256 mm² and 956 million transistors. It features 800 shading units, 40 texture mapping units and 16 ROPs. ATI has placed 512 MB GDDR5 memory on the card, which are connected using a 256-bit memory interface. The GPU is operating at a frequency of 750 MHz, memory is running at 900 MHz.
Being a dual-slot card, the ATI Radeon HD 4870 draws power from 2x 6-pin power connectors, with power draw rated at 150 W maximum. Display outputs include: 2x DVI, 1x S-Video. Radeon HD 4870 is connected to the rest of the system using a PCI-Express 2.0 x16 interface. The card measures 250 mm in length, and features a dual-slot cooling solution. Its price at launch was 299 US Dollars.

Graphics Processor

GPU Name
RV770
GPU Variant
RV770 XT
(215-0669049)
Architecture
TeraScale
Foundry
TSMC
Process Size
55 nm
Transistors
956 million
Die Size
256 mm²

Graphics Card

Release Date
Jun 25th, 2008
Generation
Radeon R700
(HD 4800)
Production
End-of-life
Launch Price
299 USD
Bus Interface
PCIe 2.0 x16

Relative Performance

10%
13%
16%
20%
23%
25%
31%
40%
40%
44%
46%
47%
54%
58%
62%
64%
67%
69%
73%
77%
79%
81%
84%
96%
97%
99%
100%
Radeon HD 4870
100%
101%
102%
108%
114%
116%
120%
121%
122%
123%
123%
124%
126%
132%
135%
144%
147%
147%
153%
154%
159%
170%
175%
176%
179%
180%
187%
189%
190%
193%
203%
206%
210%
210%
211%
211%
228%
230%
236%
238%
240%
241%
242%
246%
247%
254%
273%
280%
287%
289%
292%
295%
302%
310%
317%
324%
329%
329%
365%
401%
407%
434%
436%
442%
448%
452%
454%
461%
463%
465%
469%
494%
504%
511%
511%
562%
571%
581%
625%
686%
710%
765%
765%
807%
901%
944%
969%
1056%
1201%
Based on TPU review data: "Performance Summary" at 1920x1080

Clock Speeds

GPU Clock
750 MHz
Memory Clock
900 MHz
3600 MHz effective

Memory

Memory Size
512 MB
Memory Type
GDDR5
Memory Bus
256 bit
Bandwidth
115.2 GB/s

Render Config

Shading Units
800
TMUs
40
ROPs
16
Compute Units
10

Theoretical Performance

Pixel Rate
12.00 GPixel/s
Texture Rate
30.00 GTexel/s
FP32 (float) performance
1,200 GFLOPS
FP64 (double) performance
240.0 GFLOPS (1:5)

Board Design

Slot Width
Dual-slot
Length
9.84 inches
250 mm
TDP
150 W
Outputs
2x DVI
1x S-Video
Power Connectors
2x 6-pin
Board Number
B507

Graphics Features

DirectX
10.1
OpenGL
3.3
OpenCL
1.1
Vulkan
N/A
Shader Model
4.1

RV770 GPU Notes

Chip Variant: Wekiva
Graphics/Compute: GFX3
Display Core Engine: 3.1
Unified Video Decoder: 2.0

Retail boards based on this design (17)

Name GPU Clock Memory Clock Other Changes
ASUS HD 4870 DK TOP 815 MHz 925 MHz 9.5 inches/241 mm
ASUS HD 4870 TOP 815 MHz 925 MHz 9.5 inches/241 mm
ASUS ROG Matrix HD 4870 770 MHz 920 MHz 9.5 inches/241 mm
HIS HD 4870 IceQ 4+ Turbo 780 MHz 1000 MHz
HIS HD 4870 IceQ 4+ Turbo 1 GB 770 MHz 1000 MHz 1024 MB
HIS HD 4870 Turbo 780 MHz 1000 MHz 9.69 inches/246 mm
Palit HD 4870 Sonic Dual 775 MHz 1000 MHz 1x DVI 1x HDMI 1x DisplayPort 1x VGA
Palit HD 4870 Sonic Dual 775 MHz 1000 MHz 2x DVI 1x DisplayPort
PowerColor HD 4870 LCS 800 MHz 950 MHz 9.49 inches/241 mm, Single-slot
Sapphire HD 4870 Toxic 780 MHz 1000 MHz
Sapphire HD 4870 Toxic 1 GB 780 MHz 1000 MHz 1024 MB, 1x DVI 1x HDMI 1x VGA
Sapphire HD 4870 Vapor-X 1 GB 750 MHz 900 MHz 1024 MB, 1x DVI 1x HDMI 1x VGA
Sapphire HD 4870 Vapor-X 2 GB 750 MHz 900 MHz 2 GB, 1x DVI 1x HDMI 1x VGA
XFX HD 4870 750 MHz 900 MHz 9.5 inches/241 mm, Single-slot, 2x DVI
XFX HD 4870 1 GB 750 MHz 900 MHz 1024 MB
XFX HD 4870 XXX 775 MHz 950 MHz
XFX HD 4870 XXX 1 GB 775 MHz 950 MHz 1024 MB