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Radeon HD 3870 X2 512MB vs Radeon HD 4750

Intro

The Radeon HD 3870 X2 512MB has core clock speeds of 825 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon HD 4750, which has a clock speed of 730 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It features 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3870 X2 512MB should be 125% quicker than the Radeon HD 4750 in general, due to its higher data rate. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 64000 (125%)

Texel Rate

The Radeon HD 3870 X2 512MB is a little bit (more or less 13%) faster with regards to texture filtering than the Radeon HD 4750. (explain)

Radeon HD 3870 X2 512MB 26400 Mtexels/sec
Radeon HD 4750 23360 Mtexels/sec
Difference: 3040 (13%)

Pixel Rate

The Radeon HD 3870 X2 512MB should be a lot (more or less 126%) better at anti-aliasing than the Radeon HD 4750, and also will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 3870 X2 512MB 26400 Mpixels/sec
Radeon HD 4750 11680 Mpixels/sec
Difference: 14720 (126%)

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 512MB

Amazon.com

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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 X2 512MB Radeon HD 4750
Manufacturer AMD AMD
Year Jan 28, 2008
Code Name R680 RV740
Memory 512 MB (x2) 512 MB
Core Speed 825 MHz (x2) 730 MHz
Memory Speed 1800 MHz (x2) 3200 MHz
Power (Max TDP) (Unknown) watts 75 watts
Bandwidth 115200 MB/sec 51200 MB/sec
Texel Rate 26400 Mtexels/sec 23360 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 11680 Mpixels/sec
Unified Shaders 320(64x5) (x2) 640(128x5)
Texture Mapping Units 16 (x2) 32
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 826 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of 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 texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many 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

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Radeon HD 3870 X2 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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