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Radeon HD 3870 1GB vs Radeon HD 5750 512MB

Intro

The Radeon HD 3870 1GB uses a 55 nm design. AMD has set the core frequency at 775 MHz. The GDDR4 memory works at a frequency of 1125 MHz on this specific card. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 5750 512MB, which has a core clock frequency of 700 MHz and a GDDR5 memory speed of 1150 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It is comprised of 720(144x5) SPUs, 36 TAUs, and 16 ROPs.

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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

The Radeon HD 5750 512MB should in theory perform a bit faster than the Radeon HD 3870 1GB overall. (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 quite a bit (more or less 103%) faster with regards to 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%) faster with regards to anti-aliasing than the Radeon HD 5750 512MB, and will be able to handle higher resolutions more effectively. (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: Bandwidth is the max amount of information (in units of MB per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics 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 number of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the card's 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 also depends 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

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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