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Radeon HD 7750 vs Radeon HD 7950

Intro

The Radeon HD 7750 features a clock speed of 800 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It is made up of 512 SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 7950, which uses a 28 nm design. AMD has set the core speed at 800 MHz. The GDDR5 RAM is set to run at a speed of 1250 MHz on this particular card. It features 1792 SPUs along with 112 Texture Address Units and 32 ROPs.

Display Graphs

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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

In theory, the Radeon HD 7950 will be 233% quicker than the Radeon HD 7750 in general, due to its greater data rate. (explain)

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

Texel Rate

The Radeon HD 7950 is quite a bit (about 250%) faster with regards to AF than the Radeon HD 7750. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7950 is a better choice, and very much so. (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 largest amount of data (counted in MB per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total number of texture units by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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