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Radeon HD 3850 X2 vs Radeon HD 4750

Intro

The Radeon HD 3850 X2 comes with a GPU core speed of 668 MHz, and the 512 MB of GDDR3 RAM runs at 828 MHz through a 256-bit bus. It also is comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 4750, which features a clock speed of 730 MHz and a GDDR5 memory speed of 800 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3850 X2, in theory, should be much faster than the Radeon HD 4750 in general. (explain)

Radeon HD 3850 X2 105984 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 54784 (107%)

Texel Rate

The Radeon HD 4750 will be a bit (more or less 9%) faster with regards to AF than the Radeon HD 3850 X2. (explain)

Radeon HD 4750 23360 Mtexels/sec
Radeon HD 3850 X2 21376 Mtexels/sec
Difference: 1984 (9%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 3850 X2 is a better choice, and very much so. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
Radeon HD 4750 11680 Mpixels/sec
Difference: 9696 (83%)

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 3850 X2

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 3850 X2 Radeon HD 4750
Manufacturer AMD AMD
Year Apr 4, 2008
Code Name RV670 PRO RV740
Memory 512 MB (x2) 512 MB
Core Speed 668 MHz (x2) 730 MHz
Memory Speed 1656 MHz (x2) 3200 MHz
Power (Max TDP) (Unknown) watts 75 watts
Bandwidth 105984 MB/sec 51200 MB/sec
Texel Rate 21376 Mtexels/sec 23360 Mtexels/sec
Pixel Rate 21376 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: Memory bandwidth is the max amount of data (in units of MB per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 number of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 3850 X2

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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