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Radeon HD 3870 X2 1GB vs Radeon HD 5750 1GB

Intro

The Radeon HD 3870 X2 1GB has a core clock frequency of 825 MHz and a GDDR4 memory speed of 1126 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 that to the Radeon HD 5750 1GB, which has GPU core speed of 700 MHz, and 1024 MB of GDDR5 RAM running at 1150 MHz through a 128-bit bus. It also is made up of 720(144x5) SPUs, 36 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 3870 X2 1GB should theoretically be much superior to the Radeon HD 5750 1GB in general. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
Radeon HD 5750 1GB 73600 MB/sec
Difference: 70528 (96%)

Texel Rate

The Radeon HD 3870 X2 1GB should be just a bit (approximately 5%) better at texture filtering than the Radeon HD 5750 1GB. (explain)

Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Radeon HD 5750 1GB 25200 Mtexels/sec
Difference: 1200 (5%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 3870 X2 1GB is a better choice, and very much so. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
Radeon HD 5750 1GB 11200 Mpixels/sec
Difference: 15200 (136%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 3870 X2 1GB

Amazon.com

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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 X2 1GB Radeon HD 5750 1GB
Manufacturer AMD AMD
Year Jan 28, 2008 October 13, 2009
Code Name R680 Juniper LE
Memory 1024 MB (x2) 1024 MB
Core Speed 825 MHz (x2) 700 MHz
Memory Speed 2252 MHz (x2) 4600 MHz
Power (Max TDP) (Unknown) watts 86 watts
Bandwidth 144128 MB/sec 73600 MB/sec
Texel Rate 26400 Mtexels/sec 25200 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 11200 Mpixels/sec
Unified Shaders 320(64x5) (x2) 720(144x5)
Texture Mapping Units 16 (x2) 36
Render Output Units 16 (x2) 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 1040 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) 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 (counted in megabytes per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics 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 the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs 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 fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 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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