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Radeon HD 4850 512MB vs Radeon HD 6750 1GB

Intro

The Radeon HD 4850 512MB comes with a clock frequency of 625 MHz and a GDDR3 memory frequency of 993 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare all that to the Radeon HD 6750 1GB, which features a core clock frequency of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is made up of 720 SPUs, 36 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB 86 Watts
Radeon HD 4850 512MB 110 Watts
Difference: 24 Watts (28%)

Memory Bandwidth

In theory, the Radeon HD 6750 1GB is 1% faster than the Radeon HD 4850 512MB overall, due to its greater bandwidth. (explain)

Radeon HD 6750 1GB 64000 MB/sec
Radeon HD 4850 512MB 63552 MB/sec
Difference: 448 (1%)

Texel Rate

The Radeon HD 6750 1GB should be a little bit (approximately 4%) more effective at texture filtering than the Radeon HD 4850 512MB. (explain)

Radeon HD 6750 1GB 26100 Mtexels/sec
Radeon HD 4850 512MB 25000 Mtexels/sec
Difference: 1100 (4%)

Pixel Rate

The Radeon HD 6750 1GB should be a little bit (approximately 16%) more effective at FSAA than the Radeon HD 4850 512MB, and should be capable of handling higher resolutions more effectively. (explain)

Radeon HD 6750 1GB 11600 Mpixels/sec
Radeon HD 4850 512MB 10000 Mpixels/sec
Difference: 1600 (16%)

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 4850 512MB

Amazon.com

Check prices at:

Radeon HD 6750 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.

Specifications

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Model Radeon HD 4850 512MB Radeon HD 6750 1GB
Manufacturer AMD AMD
Year Jun 25, 2008 January 2011
Code Name RV770 PRO Juniper Pro
Memory 512 MB 1024 MB
Core Speed 625 MHz 725 MHz
Memory Speed 1986 MHz 4000 MHz
Power (Max TDP) 110 watts 86 watts
Bandwidth 63552 MB/sec 64000 MB/sec
Texel Rate 25000 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 800(160x5) 720
Texture Mapping Units 40 36
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1040 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 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 AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4850 512MB

Amazon.com

Check prices at:

Radeon HD 6750 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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