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Radeon HD 3870 X2 512MB vs Radeon HD 4750

Intro

The Radeon HD 3870 X2 512MB comes with a GPU clock speed of 825 MHz, and the 512 MB of GDDR3 memory is set to run at 900 MHz through a 256-bit bus. It also is made up of 320(64x5) Stream Processors, 16 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 4750, which makes use of a 40 nm design. AMD has set the core speed at 730 MHz. The GDDR5 memory is set to run at a speed of 800 MHz on this card. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3870 X2 512MB is 125% quicker than the Radeon HD 4750 overall, due to its greater 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 bit (approximately 13%) better at AF 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

If running with high levels of AA is important to you, then the Radeon HD 3870 X2 512MB is superior to the Radeon HD 4750, by far. (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

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 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 maximum amount of information (counted in megabytes per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher 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 one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

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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