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ATI Mobility Radeon HD 4870

The ATI Mobilty Radeon HD 4870 from AMD is a high-end DirectX 10.1 notebook graphics card. Technically, it is based on the desktop HD 4850 and 4870 GPUs but with a lower clock rate to save energy. The HD 4870 is also equipped with GDDR5 RAM, similar to its desktop variations. The successor of the HD 4870 is the Mobility Radeon HD 5870 which supports DirectX 11.

The gaming performance of the ATI Mobility Radeon HD 4870 should be comparable to, but still a bit below, the desktop HD 4850. The high amount of shaders and the 256 bit bus allows the Mobility HD 4870 to run every DirectX 9 game in high resolutions and detail settings. Demanding DirectX 10 games, such as Crysis, can be played fluently with medium to high details. Compared to the GeForce GTX 280M, the Mobility HD 4870 delivers a similar level of performance in games.

The Mobility HD 4870 is based on the RV770 chip and features 800 stream processors (160 5-dimensional shader cores). These cores do the graphics work that would normally be done by the shader- and pixel pipelines of older GPUs. The stream processors are also called ALUs and are grouped in five-way VLIW units. Each of the five instructions of a VLIW bundle has to be independent from the others and therefore much of the performance of the HD 4870 depends on the optimization of the driver.

 

The Mobility Radeon HD 4870 includes Avivo HD, UVD2 and an onboard soundchip for 7.1 sound output over HDMI or DisplayPort. The UVD2 supports full bitstream decoding of H.264/MPEG-4 AVC and VC-1 streams. In addition to this, it also supports dual video stream decoding and Picture-in Picture mode for full compliancy of the current BD-Live standard. Simply put, the Avivo HD technology handles all video tasks and enables the GPU to decode HD videos.

AMD has published a current consumption of about 65 Watt for the Mobility HD 4870. Still, it is unclear if this value represents the chip alone or the entire MXM board including the memory (which we estimate would contribute about 5 Watts).

Compared to the desktop ATI Radeon HD 4870, the mobile 4870 features a slower core clock and should therefore perform more similarly to the desktop HD 4850 and 4830.

ManufacturerATI
Mobility Radeon HD 4000 Series
Mobility Radeon HD 4870 X2 (compare) 1600 @ 550 MHz256 Bit @ 888 MHz
Mobility Radeon HD 4870 800 @ 550 MHz256 Bit @ 888 MHz
CodenameM98-XT
ArchitectureTerascale 1
Pipelines800 - unified
Core Speed550 MHz
Memory Speed888 MHz
Memory Bus Width256 Bit
Memory TypeGDDR5
Max. Amount of Memory1024 MB
Shared Memoryno
DirectXDirectX 10.1, Shader 4.1
Transistor Count956 Million
technology55 nm
Features

OpenGL 2.0, PCI-E 2.0 x16, Powerplay, DisplayPort support up to 2560x1600, HDMI support up to 1920x1080 (both with 7.1 AC3 Audio), 1x Dual-Link/Single-Link DVI, 1x Single-Link DVI Support (all display ports have to be supported by the laptop manufacturer)

Notebook Sizelarge
Date of Announcement09.01.2009
Link to Manufacturer Pagehttp://ati.amd.com/products/mobilityrade...

Benchmarks

3DMark Vantage
P Result 1280x1024 +
P GPU no PhysX 1280x1024 +
3DMark 05 - Standard 1024x768
min: 14594     avg: 16348.5     median: 16348.5 (35%)     max: 18103 Points
3DMark 06 Standard 1280x1024 +
Cinebench R10 Shading 32Bit +
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

Game Benchmarks

The following benchmarks stem from our benchmarks of review laptops. The performance depends on the used graphics memory, clock rate, processor, system settings, drivers, and operating systems. So the results don't have to be representative for all laptops with this GPU. For detailled information on the benchmark results, click on the fps number.

high 1024x768
50  fps    + Compare
» With all tested laptops playable in detail settings high.
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Benchmarks by AMD

AMD published some relative benchmarks of the new HD 4870 in relation to the old HD 3870. The benchmarks were conducted in 1920x1200 with 4xAA and 8xAF.

Relative performance of the HD 4870 to the HD 3870 conducted with a desktop Phenom x4 9950 in 1920x1200 4xAA, 8xAF
Relative performance of the HD 4870 to the HD 3870 conducted with a desktop Phenom x4 9950 in 1920x1200 4xAA, 8xAF

No reviews found for this graphics card.

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Playable games for each graphics card and their average FPS results.

Class 1
Pro Vega 56 *
Class 2
GeForce GTX 580
Radeon HD 6970
GeForce GTX 570
GeForce GTX 560 Ti
Radeon HD 5850
Radeon HD 7770
Radeon HD 7770
GeForce GTX 460 768MB
Radeon HD 6790
Radeon HD 5770
GeForce GTX 550 Ti
Radeon HD 4850
Class 3
GeForce GTS 450
Radeon HD 5670
GeForce GT 240
GeForce GT 430
Class 4
Adreno 630 *
Radeon HD 5570
GeForce GT 220
Class 5
Radeon HD 4350
GeForce G 107M *
Adreno 510 *
Chrome9HD *
Adreno 509 *
Class 6
unknown *

* Approximate position of the graphics adapter

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> Notebook / Laptop Reviews and News > Benchmarks / Tech > Comparison of Laptop Graphics Cards > AMD ATI Mobility Radeon HD 4870
Klaus Hinum (Update: 2017-09- 5)