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

Intro

The Radeon HD 3870 X2 1GB has core clock speeds of 825 MHz on the GPU, and 1126 MHz on the 1024 MB of GDDR4 memory. It features 320(64x5) SPUs as well as 16 TAUs and 16 ROPs.

Compare all of that to the Radeon HD 5750 1GB, which comes with clock speeds of 700 MHz on the GPU, and 1150 MHz on the 1024 MB of GDDR5 memory. It features 720(144x5) SPUs along with 36 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 3870 X2 1GB should theoretically be much better than the Radeon HD 5750 1GB overall. (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 a little bit (approximately 5%) faster with regards to AF 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

The Radeon HD 3870 X2 1GB is a lot (more or less 136%) faster with regards to anti-aliasing than the Radeon HD 5750 1GB, and will be able to handle higher resolutions while still performing well. (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

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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 maximum amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is worked out 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - 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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