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Radeon HD 4850 512MB vs Radeon HD 6750

Intro

The Radeon HD 4850 512MB has a GPU core speed of 625 MHz, and the 512 MB of GDDR3 RAM is set to run at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6750, which features core clock speeds of 725 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 memory. It features 720 SPUs along with 36 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The Radeon HD 6750 should in theory perform just a bit faster than the Radeon HD 4850 512MB in general. (explain)

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

Texel Rate

The Radeon HD 6750 will be just a bit (more or less 4%) more effective at AF than the Radeon HD 4850 512MB. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6750 is the winner, but not by far. (explain)

Radeon HD 6750 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

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Radeon HD 6750

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 4850 512MB Radeon HD 6750
Manufacturer AMD AMD
Year Jun 25, 2008 January 2011
Code Name RV770 PRO Juniper Pro
Memory 512 MB 512 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 4.0

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 amount of texture units of the card by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. 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 quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 4850 512MB

Amazon.com

Check prices at:

Radeon HD 6750

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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