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Radeon HD 4850 512MB vs Radeon HD 6750

Intro

The Radeon HD 4850 512MB makes use of a 55 nm design. AMD has clocked the core frequency at 625 MHz. The GDDR3 memory works at a frequency of 993 MHz on this particular card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 6750, which uses a 40 nm design. AMD has clocked the core frequency at 725 MHz. The GDDR5 RAM is set to run at a speed of 1000 MHz on this particular card. 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

Performance-wise, the Radeon HD 6750 should theoretically be a bit better than the Radeon HD 4850 512MB overall. (explain)

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

Texel Rate

The Radeon HD 6750 is a bit (more or less 4%) better 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

The Radeon HD 6750 should be just a bit (more or less 16%) more effective at FSAA than the Radeon HD 4850 512MB, and will be capable of handling higher screen resolutions more effectively. (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

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.

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: Bandwidth is the largest amount of information (in units of megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of 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 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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