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Radeon HD 4750 vs Radeon HD 4850 1GB

Intro

The Radeon HD 4750 has a GPU clock speed of 730 MHz, and the 512 MB of GDDR5 memory is set to run at 800 MHz through a 128-bit bus. It also is comprised of 640(128x5) Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

Compare all that to the Radeon HD 4850 1GB, which makes use of a 55 nm design. AMD has clocked the core frequency at 625 MHz. The GDDR4 RAM is set to run at a speed of 993 MHz on this card. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

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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

Theoretically speaking, the Radeon HD 4850 1GB should perform quite a bit faster than the Radeon HD 4750 in general. (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 bit (more or less 7%) more effective at AF 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 resolution is important to you, then the Radeon HD 4750 is a better choice, not by a very large margin though. (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: Bandwidth is the largest amount of data (measured in megabytes per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably 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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