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Radeon HD 7750 vs Radeon HD 7950

Intro

The Radeon HD 7750 uses a 28 nm design. AMD has set the core speed at 800 MHz. The GDDR5 memory works at a speed of 1125 MHz on this specific model. It features 512 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare that to the Radeon HD 7950, which has a clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 384-bit memory bus, and uses a 28 nm design. It is comprised of 1792 SPUs, 112 Texture Address Units, and 32 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

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 is 233% quicker than the Radeon HD 7750 in general, because of 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 much (about 250%) better at anisotropic filtering 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 high levels of AA is important to you, then the Radeon HD 7950 is the winner, by far. (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
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 1024 MB 1536 MB
Core Speed 800 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 4500 MHz 5000 MHz
Unified Shaders 512 1792
Texture Mapping Units 32 112
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 384-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 55 watts 200 watts
Shader Model 5.0 5.0
Bandwidth 72000 MB/sec 240000 MB/sec
Texel Rate 25600 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 12800 Mpixels/sec 25600 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video 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 amount of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

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