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Radeon HD 3850 1GB vs Radeon HD 6670 (OEM) 1GB

Intro

The Radeon HD 3850 1GB has core clock speeds of 668 MHz on the GPU, and 828 MHz on the 1024 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 16 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 6670 (OEM) 1GB, which makes use of a 40 nm design. ATi has clocked the core speed at 800 MHz. The GDDR5 RAM runs at a frequency of 1000 MHz on this specific model. It features 480 SPUs along with 24 Texture Address Units and 8 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB 63 Watts
Radeon HD 3850 1GB 75 Watts
Difference: 12 Watts (19%)

Memory Bandwidth

Performance-wise, the Radeon HD 6670 (OEM) 1GB should theoretically be much superior to the Radeon HD 3850 1GB in general. (explain)

Radeon HD 6670 (OEM) 1GB 64000 MB/sec
Radeon HD 3850 1GB 52992 MB/sec
Difference: 11008 (21%)

Texel Rate

The Radeon HD 6670 (OEM) 1GB is quite a bit (approximately 80%) more effective at texture filtering than the Radeon HD 3850 1GB. (explain)

Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 8512 (80%)

Pixel Rate

The Radeon HD 3850 1GB should be a lot (more or less 67%) more effective at FSAA than the Radeon HD 6670 (OEM) 1GB, and will be able to handle higher resolutions better. (explain)

Radeon HD 3850 1GB 10688 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Difference: 4288 (67%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Radeon HD 3850 1GB

Amazon.com

Other US-based stores

Radeon HD 6670 (OEM) 1GB

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 3850 1GB Radeon HD 6670 (OEM) 1GB
Manufacturer ATi ATi
Year Nov 19, 2007 February 2011
Code Name RV670 PRO Turks
Fab Process 55 nm 40 nm
Bus PCIe 2.0 x16/AGP 8x PCIe 2.1 x16
Memory 1024 MB 1024 MB
Core Speed 668 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 828 MHz (1656 MHz effective) 1000 MHz (4000 MHz effective)
Unified Shaders 320(64x5) 480
Texture Mapping Units 16 24
Render Output Units 16 8
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1
Power (Max TDP) 75 watts 63 watts
Shader Model 4.1 5.0
Bandwidth 52992 MB/sec 64000 MB/sec
Texel Rate 10688 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 6400 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

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