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Radeon HD 7750 vs Radeon HD 7950

Intro

The Radeon HD 7750 has a core clock frequency of 800 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is made up of 512 SPUs, 32 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 7950, which has GPU core speed of 800 MHz, and 1536 MB of GDDR5 RAM set to run at 1250 MHz through a 384-bit bus. It also is comprised of 1792 SPUs, 112 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 7950 200 Watts
Difference: 145 Watts (264%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7950 should theoretically be a lot superior to the Radeon HD 7750 overall. (explain)

Radeon HD 7950 240000 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 168000 (233%)

Texel Rate

The Radeon HD 7950 will be quite a bit (approximately 250%) better at texture filtering than the Radeon HD 7750. (explain)

Radeon HD 7950 89600 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 64000 (250%)

Pixel Rate

The Radeon HD 7950 is much (more or less 100%) better at anti-aliasing than the Radeon HD 7750, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 7950 25600 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 12800 (100%)

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 7950

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

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Model Radeon HD 7750 Radeon HD 7950
Manufacturer AMD AMD
Year February 2012 January 2012
Code Name Cape Verde Pro Tahiti Pro
Memory 1024 MB 1536 MB
Core Speed 800 MHz 800 MHz
Memory Speed 4500 MHz 5000 MHz
Power (Max TDP) 55 watts 200 watts
Bandwidth 72000 MB/sec 240000 MB/sec
Texel Rate 25600 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 12800 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 512 1792
Texture Mapping Units 32 112
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 1500 million 4313 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 in a second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

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