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Radeon HD 3850 1GB vs Radeon HD 3870 1GB

Intro

The Radeon HD 3850 1GB comes with clock speeds of 668 MHz on the GPU, and 828 MHz on the 1024 MB of GDDR3 memory. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 3870 1GB, which makes use of a 55 nm design. AMD has set the core speed at 775 MHz. The GDDR4 memory works at a speed of 1125 MHz on this model. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 1GB 75 Watts
Radeon HD 3870 1GB 106 Watts
Difference: 31 Watts (41%)

Memory Bandwidth

The Radeon HD 3870 1GB should in theory be quite a bit faster than the Radeon HD 3850 1GB overall. (explain)

Radeon HD 3870 1GB 72000 MB/sec
Radeon HD 3850 1GB 52992 MB/sec
Difference: 19008 (36%)

Texel Rate

The Radeon HD 3870 1GB will be a little bit (about 16%) more effective at anisotropic filtering than the Radeon HD 3850 1GB. (explain)

Radeon HD 3870 1GB 12400 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 1712 (16%)

Pixel Rate

The Radeon HD 3870 1GB is a little bit (about 16%) more effective at full screen anti-aliasing than the Radeon HD 3850 1GB, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 3870 1GB 12400 Mpixels/sec
Radeon HD 3850 1GB 10688 Mpixels/sec
Difference: 1712 (16%)

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 3850 1GB

Amazon.com

Check prices at:

Radeon HD 3870 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 3850 1GB Radeon HD 3870 1GB
Manufacturer AMD AMD
Year Nov 19, 2007 Nov 19, 2007
Code Name RV670 PRO RV670 XT
Memory 1024 MB 1024 MB
Core Speed 668 MHz 775 MHz
Memory Speed 1656 MHz 2250 MHz
Power (Max TDP) 75 watts 106 watts
Bandwidth 52992 MB/sec 72000 MB/sec
Texel Rate 10688 Mtexels/sec 12400 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 12400 Mpixels/sec
Unified Shaders 320(64x5) 320(64x5)
Texture Mapping Units 16 16
Render Output Units 16 16
Bus Type GDDR3 GDDR4
Bus Width 256-bit 256-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.0 x16/AGP 8x
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

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

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 3850 1GB

Amazon.com

Check prices at:

Radeon HD 3870 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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