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ATI Radeon HD 4830

RV770
Graphics Processor
640
Cores
32
TMUs
16
ROPs
512 MB
Memory Size
GDDR3
Memory Type
256 bit
Bus Width
ATI Radeon HD 4830 Photo ATI RV770 Photo
The Radeon HD 4830 was a mid-range graphics card by ATI, launched in October 2008. Built on the 55 nm process, and based on the RV770 graphics processor, in its RV770 LE 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. Unlike the fully unlocked Radeon HD 4870 Mac Edition, which uses the same GPU but has all 800 shaders enabled, ATI has disabled some shading units on the Radeon HD 4830 to reach the product's target shader count. It features 640 shading units, 32 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 575 MHz, memory is running at 900 MHz.
Being a single-slot card, the ATI Radeon HD 4830 draws power from 1x 6-pin power connectors, with power draw rated at 95 W maximum. Display outputs include: 2x DVI, 1x S-Video. Radeon HD 4830 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 130 US Dollars.

Graphics Processor

GPU Name
RV770
GPU Variant
RV770 LE
(215-0669075)
Architecture
TeraScale
Process Size
55 nm
Transistors
956 million
Die Size
256 mm²

Graphics Card

Release Date
Oct 21st, 2008
Generation
ATI Radeon R700 HD 4800
Production Status
End-of-life
Launch Price
130 USD
Bus Interface
PCIe 2.0 x16

Relative Performance

14%
18%
23%
29%
34%
36%
44%
58%
59%
64%
67%
69%
79%
84%
90%
93%
97%
100%
Radeon HD 4830
107%
113%
115%
118%
123%
140%
141%
144%
145%
146%
147%
149%
157%
165%
168%
174%
176%
177%
179%
180%
180%
183%
192%
196%
210%
214%
214%
223%
224%
232%
247%
255%
256%
261%
262%
271%
275%
277%
281%
295%
300%
305%
305%
306%
307%
332%
335%
343%
347%
348%
351%
352%
358%
359%
369%
397%
407%
418%
420%
425%
429%
439%
450%
461%
472%
479%
479%
531%
584%
592%
631%
635%
643%
652%
658%
661%
663%
670%
673%
682%
733%
743%
743%
751%
822%
841%
881%
909%
998%
1033%
1127%
1127%
1174%
1374%
1409%
Based on TPU review data: "Performance Summary" at 1920x1080

Clock Speeds

GPU Clock
575 MHz
Memory Clock
900 MHz
1800 MHz effective

Memory

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

Render Config

Shading Units
640
TMUs
32
ROPs
16
Compute Units
8

Theoretical Performance

Pixel Rate
9.200 GPixel/s
Texture Rate
18.40 GTexel/s
FP32 (float) performance
736.0 GFLOPS
FP64 (double) performance
147.2 GFLOPS (1:5)

Board Design

Slot Width
Single-slot
Length
9.69 inches
246 mm
TDP
95 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