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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 ROPs.

Compare all that to the Radeon HD 3870 1GB, which uses a 55 nm design. AMD has clocked the core frequency at 775 MHz. The GDDR4 memory is set to run at a speed of 1125 MHz on this particular card. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 Rasterization Operator Units.

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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 theoretically perform a lot faster than the Radeon HD 3850 1GB in general. (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 is a little bit (approximately 16%) more effective at texture 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

If using lots of anti-aliasing is important to you, then the Radeon HD 3870 1GB is superior to the Radeon HD 3850 1GB, but not by far. (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 largest amount of information (counted in MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, 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 amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

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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