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Radeon HD 3870 1GB vs Radeon HD 6670 (OEM) 1GB

Intro

The Radeon HD 3870 1GB features core speeds of 775 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR4 RAM. It features 320(64x5) SPUs as well as 16 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 6670 (OEM) 1GB, which makes use of a 40 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM runs at a speed of 1000 MHz on this card. It features 480 SPUs as well as 24 TAUs and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB 63 Watts
Radeon HD 3870 1GB 106 Watts
Difference: 43 Watts (68%)

Memory Bandwidth

Performance-wise, the Radeon HD 3870 1GB should theoretically be a small bit better than the Radeon HD 6670 (OEM) 1GB overall. (explain)

Radeon HD 3870 1GB 72000 MB/sec
Radeon HD 6670 (OEM) 1GB 64000 MB/sec
Difference: 8000 (13%)

Texel Rate

The Radeon HD 6670 (OEM) 1GB will be quite a bit (more or less 55%) better at AF than the Radeon HD 3870 1GB. (explain)

Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 6800 (55%)

Pixel Rate

The Radeon HD 3870 1GB will be much (more or less 94%) better at full screen anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 3870 1GB 12400 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Difference: 6000 (94%)

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

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Radeon HD 3870 1GB

Amazon.com

Check prices at:

Radeon HD 6670 (OEM) 1GB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 3870 1GB Radeon HD 6670 (OEM) 1GB
Manufacturer AMD AMD
Year Nov 19, 2007 February 2011
Code Name RV670 XT Turks
Memory 1024 MB 1024 MB
Core Speed 775 MHz 800 MHz
Memory Speed 2250 MHz 4000 MHz
Power (Max TDP) 106 watts 63 watts
Bandwidth 72000 MB/sec 64000 MB/sec
Texel Rate 12400 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 6400 Mpixels/sec
Unified Shaders 320(64x5) 480
Texture Mapping Units 16 24
Render Output Units 16 8
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 715 million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 1GB

Amazon.com

Check prices at:

Radeon HD 6670 (OEM) 1GB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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