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Written by Olin Coles   
Saturday, 30 October 2010
Table of Contents: Page Index
VisionTek 900338 Radeon HD 6870 Video Card
VisionTek 6870 Closer Look
Features and Specifications
Video Card Testing Methodology
DX10: 3DMark Vantage
DX10: Crysis Warhead
DX11: Aliens vs Predator
DX11: Battlefield Bad Company 2
DX11: BattleForge
DX9 SSAO: Mafia II
DX11: Metro 2033
DX11: Unigine Heaven 2.1
Overclocking and Temperatures
VGA Power Consumption
VisionTek 900338 Conclusion

Radeon Features

  • Microsoft DirectX 11 Support
  • AMD Eyefinity Technology
  • AMD Accelerated Parallel Processing (APP) Technology Designed for DirectCompute 5.0 and OpenCL
  • Accelerate Video Transcoding
  • 40 nm Process Technology
  • Advanced GDDR5 Memory Technology
  • 3rd Generation TeraScale Engine
  • Microsoft Windows 7 Support
  • AMD CrossFireX Technology
  • Enhanced Anisotropic Filtering
  • Accelerated Video Transcoding
  • Display Flexibility, Supports DL-DVI, DP, HDMI and D-Sub
  • HDMI 1.4a support with Deep Color and 7.1 High Bitrate Audio
  • On chip HDCP Support
  • AMD CrossFireX multi-GPU support for highly scalable performance. (Use up to four discrete cards with an AMD 790FX based motherboard)
  • AMD Avivo HD Support
    • ATI Unified Video Decoder 3 (UVD3) for 3D Blu-ray and HD Video.
    • Accelerated Video Transcoding (AVT)
    • DVD Upscaling
    • Dynamic Contrast
    • Built-in HDMI with 7.1 surround sound support
    • Dynamic power management with ATI PowerPlay technology including memory clocks
    • Dolby TrueHD and DTSHD Master Audio Support

AMD Barts GPU Details

  • ATI Radeon HD 5850 has a size of 336 sq.mm, perf/sq.mm = 22.0
  • AMD Radeon HD 6870 has a size of 255 sq.mm, perf/sq.mm = 30.3

6850/6870 Specifications

Reference Design Attribute

Radeon HD 5850

Radeon HD 5870

Radeon HD 6850

Radeon HD 6870

Process

40nm

40nm

40nm

40nm

Transistors

2.15B

2.15B

1.7B

1.7B

Engine Clock

725 MHz

850 MHz

775 MHz

900 MHz

Stream Processors

1440

1600

960

1120

Compute Performance

2.09 TFLOPS

2.72 TFLOPs

1.50 TFLOPs

2.00 TFLOPs

Texture Units

72

80

48

56

Texture Fillrate

52.2 GTexels/s

68.0 GTexel/s

37.2 GTexel/s

50.4 GTexel/s

ROPs

32

32

32

32

Pixel Fillrate

23.2 Gpixel/s

27.2 GPixel/s

24.8 GPixel/s

28.8 GPixel/s

Z/Stencil

92.8 GSamples/s

108.8 GSamples/s

99.2 GSamples/s

128.0 GSamples/s

Memory Type

GDDR5

GDDR5

GDDR5

GDDR5

Memory Clock

1000 MHz

1200 MHz

1000 MHz

1050 MHz

Memory Data Rate

4.0 Gbps

4.8 Gbps

4.0 Gbps

4.2 Gbps

Memory Bandwidth

128.0 GB/s

153.6 GB/s

128.0 GB/s

134.4 GB/s

Maximum Board Power

170W

188W

127W

151W

Idle Board Power

27W

27W

19W

19W



 

Comments 

 
# Overclocking SWServando Silva 2010-10-30 17:54
Hi Olin, I know MSI's doesn't support GPU over-voltage, but have you tried the newest version of Sapphire Trixx? Maybe you could get a pre-release version from them, as I've seen those cards overclock a lot with some extra-voltage.
Thanks for the Review.
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# Waiting a whileRealNeil 2010-10-31 20:13
Had planned to but two GTX-460's in December, but now I'm not sure. These don't do CUDA & Phys-X do they? I wonder how they scale with two on-board?
Is the CUDA and Phys-X features enough to shoot these down?
Gonna have to wait to see what develops. Can only afford an VERY occasional buy, so I want to get the best bang for the buck when I do.
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# RE: Waiting a whileOlin Coles 2010-10-31 20:19
Some people really enjoy PhysX effects in their games, and use CUDA for encoding media files. Others don't, and so it becomes a point of preference.

Keep in mind that you can buy two 1GB GTX 460's for around $340, while two Radeon HD 6870's will costs $480. This doesn't exactly put them in the same price segment, so cost becomes a major factor.
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# RE: RE: Waiting a whilechris 2010-11-01 17:35
460 1G seriously is not in the same league in terms of performance with 6870.

and where do you get 1G 460 for $170?
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# RE: RE: RE: Waiting a whileOlin Coles 2010-11-01 17:59
Thank you for reiterating the point I made over and over in this article: it takes a lightly overclocked GTX 460 to compete with the Radeon HD 6870. A heavily overclocked EVGA GTX 460 FTW puts the 6870 to shame, however.

You can buy 1GB GeForce GTX 460's at NewEgg for $170, although some now also offer rebates.
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# RE: Waiting a whileFranck 2010-11-01 08:18
I really don t see why someone should buy this card over a gtx 460 1gb hawk for example. In a price performance POV. It cost most and the diference ain t worth it.
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# Great cardRudaxx 2010-11-01 12:24
Yes i bought two of these Amd 6870 and put them in crossfire. These are great cards, With Amd you can have and use a card effectively for more than two years, but with nVidia up to one year and you become obsolete, they are hot and very loud and who cares about cuda and physix i prefer Havok. Besides 90% of games are Havoc and they work great, not like physix in mafia 2 where you need an extra card to make it slightly more stable, with one it lags. I've never had problems with ati cards or their driver but with nvidia its a whole other story. By the way if you type "nvidia driver problems" on google you get 8 million results.
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# RE: Great cardJack 2010-11-01 12:43
You're right that the 6870 does seem like a great card and a worthy successor to the HD5770. Every benchmark I have seen shows the 6870 performing with and in some cases outperforming the GTX 460. Although, I game with a single Gigabyte GTX 470 SOC and haven't noticed any of the issues with PhysX you mentioned. By the way, if you type "ATI Driver Problems" into Google you will get nearly just as many results (7.2 million when I checked). You say that after one year nVidia cards become obsolete but I was still using my old BFG 8800GT 512MB card I got back in the summer of 08 until I upgraded to the Gigabyte GTX 470. That's 2+ years of great use and 0 driver problems. Either way, both sets of cards, AMD and nVidia, are impressive. Anyone, looking to buy either the HD6870 or the HD6850 should also consider the GTX 460 1GB, and look at performance benchmarks, heat, and power usage before coming to an informed decision. BTW, I am really interested in the GTX 580 vs HD69XX cards.
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# RE: VisionTek 900338 Radeon HD 6870 Video CardNick 2010-11-18 20:29
What are the physical w/h/d dimensions of the 6870?
I am looking to put this into my case, and need specs.
Sorry, I can't find specs anywhere online.
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# Same as it ever was....BruceBruce 2010-11-18 20:36
...with apologies to David Byrne. This is a reference card, and will be the same size as many of the other cards released at the AMD launch.

Height: 115 mm
Length: 245 mm
Width: 35 mm (Dual-slot)
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# RE: RE: VisionTek 900338 Radeon HD 6870 Video CardOlin Coles 2010-11-18 21:19
They're right there in the middle of page two. I even included the Radeon HD 6850 dimensions. If you read the article, you can't miss it.
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