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Radeon HD 4850 512MB vs Radeon HD 7750

Intro

The Radeon HD 4850 512MB comes with core clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 7750, which comes with a clock speed of 800 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It is made up of 512 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 4850 512MB 110 Watts
Difference: 55 Watts (100%)

Memory Bandwidth

In theory, the Radeon HD 7750 is 13% quicker than the Radeon HD 4850 512MB in general, because of its greater data rate. (explain)

Radeon HD 7750 72000 MB/sec
Radeon HD 4850 512MB 63552 MB/sec
Difference: 8448 (13%)

Texel Rate

The Radeon HD 7750 will be a little bit (more or less 2%) more effective at AF than the Radeon HD 4850 512MB. (explain)

Radeon HD 7750 25600 Mtexels/sec
Radeon HD 4850 512MB 25000 Mtexels/sec
Difference: 600 (2%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7750 is the winner, by a large margin. (explain)

Radeon HD 7750 12800 Mpixels/sec
Radeon HD 4850 512MB 10000 Mpixels/sec
Difference: 2800 (28%)

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 7750

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 7750
Manufacturer AMD AMD
Year Jun 25, 2008 February 2012
Code Name RV770 PRO Cape Verde Pro
Memory 512 MB 1024 MB
Core Speed 625 MHz 800 MHz
Memory Speed 1986 MHz 4500 MHz
Power (Max TDP) 110 watts 55 watts
Bandwidth 63552 MB/sec 72000 MB/sec
Texel Rate 25000 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 800(160x5) 512
Texture Mapping Units 40 32
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 956 million 1500 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number 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 fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4850 512MB

Amazon.com

Check prices at:

Radeon HD 7750

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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