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Radeon HD 3870 512MB vs Radeon HD 4750

Intro

The Radeon HD 3870 512MB makes use of a 55 nm design. AMD has set the core speed at 775 MHz. The GDDR3 RAM runs at a speed of 900 MHz on this model. It features 320(64x5) SPUs as well as 16 TAUs and 16 ROPs.

Compare all of that to the Radeon HD 4750, which has GPU core speed of 730 MHz, and 512 MB of GDDR5 memory set to run at 800 MHz through a 128-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750 75 Watts
Radeon HD 3870 512MB 106 Watts
Difference: 31 Watts (41%)

Memory Bandwidth

In theory, the Radeon HD 3870 512MB should perform a little bit faster than the Radeon HD 4750 overall. (explain)

Radeon HD 3870 512MB 57600 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 6400 (13%)

Texel Rate

The Radeon HD 4750 is much (approximately 88%) more effective at anisotropic filtering than the Radeon HD 3870 512MB. (explain)

Radeon HD 4750 23360 Mtexels/sec
Radeon HD 3870 512MB 12400 Mtexels/sec
Difference: 10960 (88%)

Pixel Rate

The Radeon HD 3870 512MB is a little bit (about 6%) more effective at AA than the Radeon HD 4750, and should be capable of handling higher resolutions better. (explain)

Radeon HD 3870 512MB 12400 Mpixels/sec
Radeon HD 4750 11680 Mpixels/sec
Difference: 720 (6%)

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 512MB

Amazon.com

Check prices at:

Radeon HD 4750

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 512MB Radeon HD 4750
Manufacturer AMD AMD
Year Nov 19, 2007
Code Name RV670 XT RV740
Memory 512 MB 512 MB
Core Speed 775 MHz 730 MHz
Memory Speed 1800 MHz 3200 MHz
Power (Max TDP) 106 watts 75 watts
Bandwidth 57600 MB/sec 51200 MB/sec
Texel Rate 12400 Mtexels/sec 23360 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 11680 Mpixels/sec
Unified Shaders 320(64x5) 640(128x5)
Texture Mapping Units 16 32
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 826 million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result 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 anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 512MB

Amazon.com

Check prices at:

Radeon HD 4750

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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