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Radeon HD 3870 1GB vs Radeon HD 5750 1GB

Intro

The Radeon HD 3870 1GB has a clock speed of 775 MHz and a GDDR4 memory speed of 1125 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 5750 1GB, which uses a 40 nm design. AMD has set the core speed at 700 MHz. The GDDR5 memory is set to run at a speed of 1150 MHz on this specific model. It features 720(144x5) SPUs as well as 36 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 1GB 86 Watts
Radeon HD 3870 1GB 106 Watts
Difference: 20 Watts (23%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5750 1GB should in theory be a little bit superior to the Radeon HD 3870 1GB overall. (explain)

Radeon HD 5750 1GB 73600 MB/sec
Radeon HD 3870 1GB 72000 MB/sec
Difference: 1600 (2%)

Texel Rate

The Radeon HD 5750 1GB is much (more or less 103%) more effective at anisotropic filtering than the Radeon HD 3870 1GB. (explain)

Radeon HD 5750 1GB 25200 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 12800 (103%)

Pixel Rate

The Radeon HD 3870 1GB should be just a bit (about 11%) more effective at anti-aliasing than the Radeon HD 5750 1GB, and capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 3870 1GB 12400 Mpixels/sec
Radeon HD 5750 1GB 11200 Mpixels/sec
Difference: 1200 (11%)

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 5750 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 5750 1GB
Manufacturer AMD AMD
Year Nov 19, 2007 October 13, 2009
Code Name RV670 XT Juniper LE
Memory 1024 MB 1024 MB
Core Speed 775 MHz 700 MHz
Memory Speed 2250 MHz 4600 MHz
Power (Max TDP) 106 watts 86 watts
Bandwidth 72000 MB/sec 73600 MB/sec
Texel Rate 12400 Mtexels/sec 25200 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 11200 Mpixels/sec
Unified Shaders 320(64x5) 720(144x5)
Texture Mapping Units 16 36
Render Output Units 16 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 1040 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 3.2

Memory Bandwidth: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 texture map elements (texels) that are processed per second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The better 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 a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 1GB

Amazon.com

Check prices at:

Radeon HD 5750 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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