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Radeon HD 3850 X2 vs Radeon HD 4750

Intro

The Radeon HD 3850 X2 uses a 55 nm design. AMD has clocked the core frequency at 668 MHz. The GDDR3 RAM works at a frequency of 828 MHz on this specific card. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

Compare all that to the Radeon HD 4750, which features core speeds of 730 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. 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

Performance-wise, the Radeon HD 3850 X2 should in theory be much superior to the Radeon HD 4750 overall. (explain)

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

Texel Rate

The Radeon HD 4750 should be just a bit (more or less 9%) faster with regards to anisotropic filtering 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

The Radeon HD 3850 X2 should be quite a bit (more or less 83%) faster with regards to FSAA than the Radeon HD 4750, and also able to handle higher resolutions without losing too much performance. (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: Bandwidth is the max amount of information (in units of MB per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 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 high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is worked out 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 video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory per 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 - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential 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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