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Radeon HD 3870 1GB vs Radeon HD 5750 1GB

Intro

The Radeon HD 3870 1GB makes use of a 55 nm design. AMD has clocked the core speed at 775 MHz. The GDDR4 memory runs at a frequency of 1125 MHz on this specific model. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon HD 5750 1GB, which has a core clock frequency of 700 MHz and a GDDR5 memory speed of 1150 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It is comprised of 720(144x5) SPUs, 36 Texture Address Units, and 16 Raster Operation 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

Performance-wise, the Radeon HD 5750 1GB should theoretically be just a 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 texture 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 3870 1GB is the winner, though only just barely. (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: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the card will be at handling 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 that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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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.

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