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Radeon HD 7750 vs Radeon HD 7850

Intro

The Radeon HD 7750 makes use of a 28 nm design. AMD has set the core speed at 800 MHz. The GDDR5 RAM runs at a frequency of 1125 MHz on this particular model. It features 512 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 7850, which has a core clock speed of 860 MHz and a GDDR5 memory speed of 1200 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It is made up of 1024 SPUs, 64 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 7850 130 Watts
Difference: 75 Watts (136%)

Memory Bandwidth

Theoretically, the Radeon HD 7850 should perform quite a bit faster than the Radeon HD 7750 overall. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 81600 (113%)

Texel Rate

The Radeon HD 7850 is a lot (about 115%) more effective at texture filtering than the Radeon HD 7750. (explain)

Radeon HD 7850 55040 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 29440 (115%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7850 is a better choice, and very much so. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 14720 (115%)

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 7750

Amazon.com

Radeon HD 7850

Amazon.com

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

Display Specifications

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Model Radeon HD 7750 Radeon HD 7850
Manufacturer AMD AMD
Year February 2012 March 2012
Code Name Cape Verde Pro Pitcairn Pro
Memory 1024 MB 2048 MB
Core Speed 800 MHz 860 MHz
Memory Speed 4500 MHz 4800 MHz
Power (Max TDP) 55 watts 130 watts
Bandwidth 72000 MB/sec 153600 MB/sec
Texel Rate 25600 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 12800 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 512 1024
Texture Mapping Units 32 64
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 1500 million 2800 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better 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 that the graphics card could possibly write to its 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 the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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