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Radeon HD 4750 vs Radeon HD 4850 1GB

Intro

The Radeon HD 4750 uses a 40 nm design. AMD has clocked the core frequency at 730 MHz. The GDDR5 memory is set to run at a frequency of 800 MHz on this card. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Compare those specifications to the Radeon HD 4850 1GB, which comes with a clock speed of 625 MHz and a GDDR4 memory speed of 993 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750 75 Watts
Radeon HD 4850 1GB 110 Watts
Difference: 35 Watts (47%)

Memory Bandwidth

Performance-wise, the Radeon HD 4850 1GB should theoretically be a lot better than the Radeon HD 4750 overall. (explain)

Radeon HD 4850 1GB 63552 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 12352 (24%)

Texel Rate

The Radeon HD 4850 1GB will be a small bit (approximately 7%) more effective at anisotropic filtering than the Radeon HD 4750. (explain)

Radeon HD 4850 1GB 25000 Mtexels/sec
Radeon HD 4750 23360 Mtexels/sec
Difference: 1640 (7%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4750 is superior to the Radeon HD 4850 1GB, though not by far. (explain)

Radeon HD 4750 11680 Mpixels/sec
Radeon HD 4850 1GB 10000 Mpixels/sec
Difference: 1680 (17%)

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 4750

Amazon.com

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Radeon HD 4850 1GB

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 4750 Radeon HD 4850 1GB
Manufacturer AMD AMD
Year Jun 25, 2008
Code Name RV740 RV770 PRO
Memory 512 MB 1024 MB
Core Speed 730 MHz 625 MHz
Memory Speed 3200 MHz 1986 MHz
Power (Max TDP) 75 watts 110 watts
Bandwidth 51200 MB/sec 63552 MB/sec
Texel Rate 23360 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 11680 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 640(128x5) 800(160x5)
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR4
Bus Width 128-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 826 million 956 million
Bus PCIe 2.0 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 maximum amount of information (counted in MB per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock 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 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 texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units by the core 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 4750

Amazon.com

Check prices at:

Radeon HD 4850 1GB

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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