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Radeon HD 3870 1GB vs Radeon HD 5750 512MB

Intro

The Radeon HD 3870 1GB has a core clock frequency of 775 MHz and a GDDR4 memory speed of 1125 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It features 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 5750 512MB, which uses a 40 nm design. AMD has clocked the core speed at 700 MHz. The GDDR5 memory is set to run at a speed of 1150 MHz on this card. It features 720(144x5) SPUs along with 36 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 512MB 86 Watts
Radeon HD 3870 1GB 106 Watts
Difference: 20 Watts (23%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5750 512MB should be a bit faster than the Radeon HD 3870 1GB in general. (explain)

Radeon HD 5750 512MB 73600 MB/sec
Radeon HD 3870 1GB 72000 MB/sec
Difference: 1600 (2%)

Texel Rate

The Radeon HD 5750 512MB will be a lot (about 103%) more effective at texture filtering than the Radeon HD 3870 1GB. (explain)

Radeon HD 5750 512MB 25200 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 12800 (103%)

Pixel Rate

The Radeon HD 3870 1GB should be a bit (approximately 11%) better at AA than the Radeon HD 5750 512MB, and should be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 3870 1GB 12400 Mpixels/sec
Radeon HD 5750 512MB 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 512MB

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 512MB
Manufacturer AMD AMD
Year Nov 19, 2007 October 13, 2009
Code Name RV670 XT Juniper LE
Memory 1024 MB 512 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 maximum amount of information (counted in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 1GB

Amazon.com

Check prices at:

Radeon HD 5750 512MB

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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