Topic Title: My new Radeon HD 7870 is too slow
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Created On: 08/25/2012 03:19 AM
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 08/25/2012 03:19 AM
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zyuan888
n00b

Posts: 2
Joined: 08/25/2012

Graphics Card

ASUS Radeon HD7870-DC2-2GD5

AMD Catalyst Driver Version, and Driver History

Catalyst Version: 12.8, Driver Package Version: 8.982-120727a-144945C-ATI

Operating System

Windows 7, 64 Bits SP1

Applications

Dxo Optic Pro 7.53

CPU Details

Intel i7-3770

Display Device(s) and Connection(s) Used

Dell U2311, DVI connection to the Graphic Card

Motherboard or System Make & Model

ASUS P8Z77-V

System Memory Type & Amount

Kingston HyperX Low Voltage 1600 MHz 4GB x 4

Power Supply

Antec High Current Pro 750W HCP-750 Gold

Additional Hardware

SSD Boot Drive: Intel 330 Series 180GB

Issue Details

I am using Dxo Optic Pro 7 to process digital images. During the startup, this software checks the CPU and Graphic card performance to determine whether it can turn on the OpenCL option to use GPU for parallel computing. The HD 7870 in my system turned out a surprisingly low number, which is slower than my CPU's performance, so I can not use the OpenCL option with Dxo Optic Pro 7.  The log showed that my CPU's performance index is at 2071.83 and HD7870's performance index is only at 1601.84. I contacted Dxo support and was told that the performance test in Dxo uses a standard method, regardless the graphic card's brand and model. So, I can not argue with it. However, he showed me a comparable sample in his machine and made me wondering whether my graphic card is a defect.  He showed me his system with an i7 CPU and a GeForce GTX 460 card, and the same Dxo software displayed his CPU performance index is at 1306.16 and GTX 460 performance index is at 2946.77. Here is my problem: -- my supposed latest and greatest AMD graphic card cannot even beat a two years old computer system with an outdated GeForce GTX 460!!!!!!, barely reach half of the GTX460's performance under the same testing condition!!!!!!!!!!. I read many reviews about HD7870 from internet, and all of them pointed out that the performance of the HD7870 should be on par with GeForce GTX570 or GTX580 in general. Can anyone help me to understand whether my HD7870 card is a defect or it really has very poor OpenCL performance by design, therefore I should return it to the seller and exchange a Nivdia GTX card? or anyone know some settings/software that can boost this graphic card's OpenCL performance? I prefer not to overclock my system, but I do need a lot of processing power to handle my high resolution digital images. That is the main reason I brought this latest AMD graphic card, as well as its low power consumption. It turned out a major disappointment, at least for current moment.

Thanks for any advice in advance



Edited: 08/25/2012 at 03:32 AM by zyuan888
 08/25/2012 11:56 AM
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black_zion
80 Column Mind

Posts: 12244
Joined: 04/17/2008



You should have went with a HD 6950/70, GCN is just released architecture, plus the 7850/70 is upper mainstream, not the high end 7950/70.

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ASUS Sabertooth 990FX/Gen3 R2, FX-8350 w/ Corsair H60, 8 GiB G.SKILL RipjawsX DDR3-2133, XFX HD 7970 Ghz, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, HP ZR2440w, Win 7 Ultimate x64
 08/25/2012 12:08 PM
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Vantharas
Polygon Pusher

Posts: 3505
Joined: 03/01/2009

To make that chart a little more clear. The 7870 is a dominate monster in single precision Open CL. However you can see that it is not in double precision. 

A 7950 offers 3.5 times faster double precision (Beating out AMD's previous 6950/6970 by a fair margin 845 for the 7950 and 1100 for the 7970) and a 7970 is 20% faster then a 7950 at double precision. And of course single precision climbes expodentially into the 4k territory.



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Edited: 08/25/2012 at 12:14 PM by Vantharas
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