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ATI Radeon HD 4850

RV770
Graphics Processor
800
Cores
40
TMUs
16
ROPs
512 MB
Memory Size
GDDR3
Memory Type
256 bit
Bus Width
ATI Radeon HD 4850 Photo ATI RV770 Photo
The Radeon HD 4850 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 PRO 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 GDDR3 memory on the card, which are connected using a 256-bit memory interface. The GPU is operating at a frequency of 625 MHz, memory is running at 993 MHz.
Being a single-slot card, the ATI Radeon HD 4850 draws power from 1x 6-pin power connectors, with power draw rated at 110 W maximum. Display outputs include: 2x DVI, 1x S-Video. Radeon HD 4850 is connected to the rest of the system using a PCI-Express 2.0 x16 interface. The card measures 246 mm in length, and features a single-slot cooling solution. Its price at launch was 199 US Dollars.

Graphics Processor

GPU Name
RV770
GPU Variant
RV770 PRO
(215-0669065)
Architecture
TeraScale
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
199 USD
Bus Interface
PCIe 2.0 x16

Relative Performance

13%
16%
20%
26%
30%
32%
40%
52%
52%
57%
60%
61%
70%
75%
80%
83%
86%
89%
95%
100%
Radeon HD 4850
102%
105%
109%
124%
125%
128%
129%
129%
131%
132%
140%
147%
149%
155%
156%
158%
159%
159%
160%
163%
171%
174%
187%
190%
190%
198%
199%
206%
220%
226%
228%
232%
233%
241%
244%
246%
250%
262%
267%
271%
271%
272%
273%
295%
297%
304%
308%
310%
312%
313%
318%
319%
328%
353%
362%
371%
373%
377%
381%
390%
400%
409%
419%
425%
425%
471%
519%
526%
561%
564%
572%
579%
584%
587%
595%
598%
601%
606%
638%
652%
660%
660%
726%
738%
751%
807%
887%
918%
989%
989%
1043%
1220%
1252%
1364%
1552%
Based on TPU review data: "Performance Summary" at 1920x1080

Clock Speeds

GPU Clock
625 MHz
Memory Clock
993 MHz
1986 MHz effective

Memory

Memory Size
512 MB
Memory Type
GDDR3
Memory Bus
256 bit
Bandwidth
63.55 GB/s

Render Config

Shading Units
800
TMUs
40
ROPs
16
Compute Units
10

Theoretical Performance

Pixel Rate
10.00 GPixel/s
Texture Rate
25.00 GTexel/s
FP32 (float) performance
1,000 GFLOPS
FP64 (double) performance
200.0 GFLOPS (1:5)

Board Design

Slot Width
Single-slot
Length
9.69 inches
246 mm
TDP
110 W
Outputs
2x DVI
1x S-Video
Power Connectors
1x 6-pin
Board Number
B501

Graphics Features

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

RV770 GPU Notes

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

Retail boards based on this design (12)

Name GPU Clock Memory Clock Other Changes
ASUS HD 4850 CUcore TOP 1 GB 670 MHz 1004 MHz 1024 MB, Dual-slot, 2x DVI
ASUS HD 4850 TOP 680 MHz 1050 MHz
ASUS ROG Matrix HD 4850 625 MHz 993 MHz Dual-slot
HIS HD 4850 IceQ 4 TurboX 685 MHz 1100 MHz 9.685 inches/246 mm, Dual-slot
Palit HD 4850 Sonic 1 GB 685 MHz 1000 MHz 1024 MB, Dual-slot
Palit HD 4850 Sonic Special 700 MHz 900 MHz GDDR5, Dual-slot, 1x DVI 1x HDMI 1x DisplayPort 1x VGA
PowerColor HD 4850 PCS+ 675 MHz 1100 MHz GDDR4, 9.5 inches/241 mm
PowerColor HD 4850 PCS+ 1 GB 665 MHz 950 MHz 1024 MB, 9.5 inches/241 mm
Sapphire HD 4850 625 MHz 1008 MHz
Sapphire HD 4850 Toxic 675 MHz 1150 MHz
Sapphire HD 4850 Vapor-X 650 MHz 1000 MHz 1x DVI 1x HDMI 1x VGA
Sapphire HD 4850 Vapor-X 1 GB 650 MHz 1000 MHz 1024 MB, 1x DVI 1x HDMI 1x VGA