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Radeon HD 3870 1GB vs Radeon HD 5750 1GB

Intro

The Radeon HD 3870 1GB has a clock frequency of 775 MHz and a GDDR4 memory frequency of 1125 MHz. It also features a 256-bit bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

Compare that to the Radeon HD 5750 1GB, which has a clock speed of 700 MHz and a GDDR5 memory frequency of 1150 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It features 720(144x5) SPUs, 36 TAUs, and 16 ROPs.

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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

In theory, the Radeon HD 5750 1GB is 2% faster than the Radeon HD 3870 1GB overall, due to its greater data rate. (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 quite a bit (approximately 103%) faster with regards to AF 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

The Radeon HD 3870 1GB will be a bit (about 11%) better at FSAA than the Radeon HD 5750 1GB, and able to handle higher screen resolutions more effectively. (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: Bandwidth is the max amount of information (counted in MB per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video 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 most pixels that 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 number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

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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