ATI Mobility Radeon HD 3870 X2 vs ATI Mobility Radeon HD 3850

ATI Mobility Radeon HD 3870 X2

► remove ATI Mobility Radeon HD 3870 X2

The Mobility Radeon X3870 X2 combines two Mobility Radeon 3870 graphics cards (on MXM boards) onto one laptop in Crossfire (CF) mode. Therefore, the combination has a power consumption of roughly both cards combined. While the total available VRAM has been doubled, the effective VRAM is actually half of the combined total as each card must store the same textures and data onto their own respective onboard VRAM chips.

Depending on the application, the performance of the Radeon X3870 X2 about 0-40 percent above a single Mobility HD 3870 and is even a bit above the GeForce 8800M GTX SLI solution. Most, if not all, DirectX 9 games can run fluently in high resolutions and detail settings. More demanding DirectX 10 games, such as Crysis,  will only run acceptably well on medium to high detail settings with lowered resolutions.

As with all multi-GPU solutions, the HD 3870 X2 may suffer from a phenomenon known as micro stuttering. See here for an overview of the term and why it happens.

Hardware features that can be found on a single Mobility HD 3870 have been preserved in the Crossfire combination. As a result, the dual GPU setup can take advantage of Avivo HD in order to aid the CPU in decoding videos.

The power consumption of the Mobility 3870 X2 can be up to 110 Watt when including the MXM boards and VRAM chips. AMD specifies that the HD 3800 series can draw up to 33-55 Watt per card.

ATI Mobility Radeon HD 3850

► remove ATI Mobility Radeon HD 3850

The AMD ATI Mobility Radeon HD 3850 is a slower clocked desktop HD 3850 and manufactured in 55 nm. It supports DirectX 10.1 in hardware and also features the Avivo HD video engine to help the CPU decode videos. The card is intended to be used in large laptops.

 

The performance of the graphics card is between the GeForce 8700M GT and the 8800M GTS. The ATI Mobility Radeon HD 4650 of the successor generation performed similar but with a much lower power consumption. Therefore, the performance should be sufficient for DirectX 9 games in medium to high details (see games list beyond).

The RV670 chip has 64 5-dimensional unified shaders with 16 ROPs, 16 TMUs, and 32 TAUs.

The Avivo HD video engine helps the cpu in decoding HD videos (MPEG-2, H.264, VC-1). The HD 3850 houses the UVD+ (Unified Video Decoder) that is capable of decoding MPEG-2, H.265/AVC, and VC-1 nearly fully. The UVD2 in the HD 4000 generation is capable of full bitstream decoding and two video streams can be decoded at once (which UVD+ can not).

Compared to desktop graphics cards, the HD 3850 is similar to the Radeon HD 3850 but features a much lower clock speed, leading to a worse performance.

The power consumption of the HD 3800 series lies between 35-55 Watt.

 

ATI Mobility Radeon HD 3870 X2ATI Mobility Radeon HD 3850
ManufacturerATIATI
Mobility Radeon HD 3800 Series
Mobility Radeon HD 3870 X2 640 @ 660 MHz256 Bit @ 850 MHz
Mobility Radeon HD 3850 320 @ 580 MHz256 Bit @ 750 MHz
Mobility Radeon HD 3870 X2 640 @ 660 MHz256 Bit @ 850 MHz
Mobility Radeon HD 3850 320 @ 580 MHz256 Bit @ 750 MHz
CodenameM88-XT CFM88
ArchitectureRV6xxRV6xx
640 - 320 -
Core660 MHz580 MHz
Memory850 MHz750 MHz
Bus256 Bit256 Bit
MemoryGDDR3GDDR3
nono
DirectXDirectX 10.1, 4.0DirectX 10.1, 4.1
Transistors1332 Million666 Million
Technology55 nm55 nm
Size
Introduced01.09.2008 01.12.2007
FeaturesHDMI, Dual-Link DVI (wenn vom Hersteller verbaut), HDCP, PCI-Express 2.0
55nm, Display Port with external transmitter
Manufacturerhttp://ati.amd.com/products/mobilityrade...

3DMark Vantage
P Result 1280x1024 + ATI Mobility Radeon HD 3870 X2
P Result 1280x1024 + ATI Mobility Radeon HD 3850
P GPU no PhysX 1280x1024 + ATI Mobility Radeon HD 3870 X2
P GPU no PhysX 1280x1024 + ATI Mobility Radeon HD 3850
3DMark 2001SE - Standard 1024x768
min: 35136     avg: 37542.5     median: 37542 (39%)     max: 39949 Points
3DMark 03 - Standard 1024x768
min: 53261     avg: 55111     median: 55742 (29%)     max: 56330 Points
18761 Points (10%)
3DMark 05 - Standard 1024x768
min: 17271     avg: 19187     median: 20115 (38%)     max: 20175 Points
8816 Points (17%)
3DMark 06 Standard 1280x1024 + ATI Mobility Radeon HD 3870 X2
+ ATI Mobility Radeon HD 3850
Cinebench R10 Shading 32Bit + ATI Mobility Radeon HD 3870 X2
Shading 32Bit + ATI Mobility Radeon HD 3850

Average Benchmarks ATI Mobility Radeon HD 3870 X2 → 100%

Average Benchmarks ATI Mobility Radeon HD 3850 → 40%

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-
* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation

Crysis - GPU Benchmark

Crysis - GPU Benchmark

2007
low 1024x768
100%
Mobility Radeon HD 3870 X2:
67.7  fps
47%
Mobility Radeon HD 3850:
32.1  fps
med. 1024x768
100%
Mobility Radeon HD 3870 X2:
36.6  fps
74%
Mobility Radeon HD 3850:
27  fps
high 1024x768
100%
Mobility Radeon HD 3870 X2:
30.9  fps
68%
Mobility Radeon HD 3850:
21.1  fps
Mobility Radeon HD 3870 X2:
»
Mobility Radeon HD 3850:
»
Crysis - CPU Benchmark

Crysis - CPU Benchmark

2007
low 1024x768
100%
Mobility Radeon HD 3870 X2:
84.1  fps
44%
Mobility Radeon HD 3850:
37.1  fps
med. 1024x768
100%
Mobility Radeon HD 3870 X2:
37.3  fps
64%
Mobility Radeon HD 3850:
23.8  fps
high 1024x768
100%
Mobility Radeon HD 3870 X2:
30.1  fps
65%
Mobility Radeon HD 3850:
19.7  fps
Mobility Radeon HD 3870 X2:
»
Mobility Radeon HD 3850:
»
Call of Juarez Benchmark

Call of Juarez Benchmark

2006
high 1024x768
100%
Mobility Radeon HD 3870 X2:
66  fps
Mobility Radeon HD 3870 X2:
»
The Elder Scrolls IV - Oblivion

The Elder Scrolls IV - Oblivion

2006
high 1280x800
100%
Mobility Radeon HD 3870 X2:
60  fps
Mobility Radeon HD 3870 X2:
»
F.E.A.R.

F.E.A.R.

2005
low 640x480
Mobility Radeon HD 3850:
144  fps
med. 800x600
Mobility Radeon HD 3850:
22  fps
high 1024x768
Mobility Radeon HD 3850:
21  fps
Mobility Radeon HD 3850:
»
Doom 3

Doom 3

2004
low 640x480
100%
Mobility Radeon HD 3870 X2:
191  fps
med. 640x480
100%
Mobility Radeon HD 3870 X2:
191.7  fps
high 800x600
100%
Mobility Radeon HD 3870 X2:
190.3  fps
ultra 1024x768
100%
Mobility Radeon HD 3870 X2:
181.8  fps
Mobility Radeon HD 3870 X2:
»
Quake 3 Arena - Timedemo

Quake 3 Arena - Timedemo

1999
high 1024x768
Mobility Radeon HD 3850:
343.8  fps
Mobility Radeon HD 3850:
»

Average Gaming ATI Mobility Radeon HD 3870 X2 → 100%

Average Gaming ATI Mobility Radeon HD 3850 → 60%

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Redaktion, 2017-09- 8 (Update: 2017-09-11)