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Radeon HD 3850 1GB vs Radeon HD 3870 1GB

Intro

The Radeon HD 3850 1GB comes with core 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 that to the Radeon HD 3870 1GB, which makes use of a 55 nm design. AMD has clocked the core speed at 775 MHz. The GDDR4 memory runs at a speed of 1125 MHz on this particular model. It features 320(64x5) SPUs along with 16 TAUs 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

Performance-wise, the Radeon HD 3870 1GB should theoretically be a lot superior to 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 will be just a bit (approximately 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 will be a bit (more or less 16%) better at full screen anti-aliasing than the Radeon HD 3850 1GB, and also should be capable of handling higher screen resolutions better. (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

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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 max amount of information (measured in megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum 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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