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Radeon HD 3850 256MB vs Radeon HD 4750

Intro

The Radeon HD 3850 256MB comes with a clock speed of 668 MHz and a GDDR3 memory speed of 828 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, 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 memory. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

As far as performance goes, the Radeon HD 3850 256MB should theoretically be a small bit superior to the Radeon HD 4750 in general. (explain)

Radeon HD 3850 256MB 52992 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 1792 (4%)

Texel Rate

The Radeon HD 4750 will be a lot (more or less 119%) more effective at anisotropic filtering than the Radeon HD 3850 256MB. (explain)

Radeon HD 4750 23360 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 12672 (119%)

Pixel Rate

The Radeon HD 4750 should be just a bit (about 9%) more effective at FSAA than the Radeon HD 3850 256MB, and also capable of handling higher resolutions more effectively. (explain)

Radeon HD 4750 11680 Mpixels/sec
Radeon HD 3850 256MB 10688 Mpixels/sec
Difference: 992 (9%)

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 3850 256MB

Amazon.com

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Radeon HD 4750

Amazon.com

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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 256MB Radeon HD 4750
Manufacturer AMD AMD
Year Nov 19, 2007
Code Name RV670 PRO RV740
Memory 256 MB 512 MB
Core Speed 668 MHz 730 MHz
Memory Speed 1656 MHz 3200 MHz
Power (Max TDP) 75 watts 75 watts
Bandwidth 52992 MB/sec 51200 MB/sec
Texel Rate 10688 Mtexels/sec 23360 Mtexels/sec
Pixel Rate 10688 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: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

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

Display Prices

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Radeon HD 3850 256MB

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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