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GeForce GTX 650 vs Radeon HD 7950

Intro

The GeForce GTX 650 has a core clock speed of 1058 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 128-bit memory bus, and uses a 28 nm design. It features 384 SPUs, 32 TAUs, and 16 ROPs.

Compare all of that to the Radeon HD 7950, which comes with a GPU core clock speed of 800 MHz, and 1536 MB of GDDR5 RAM set to run at 1250 MHz through a 384-bit bus. It also is made up of 1792 SPUs, 112 Texture Address Units, and 32 Raster Operation Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7950 7731 points
GeForce GTX 650 2263 points
Difference: 5468 (242%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 7950 200 Watts
Difference: 136 Watts (213%)

Memory Bandwidth

In theory, the Radeon HD 7950 should be 200% quicker than the GeForce GTX 650 in general, due to its higher bandwidth. (explain)

Radeon HD 7950 240000 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 160000 (200%)

Texel Rate

The Radeon HD 7950 will be much (more or less 165%) faster with regards to anisotropic filtering than the GeForce GTX 650. (explain)

Radeon HD 7950 89600 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 55744 (165%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7950 is superior to the GeForce GTX 650, by a large margin. (explain)

Radeon HD 7950 25600 Mpixels/sec
GeForce GTX 650 16928 Mpixels/sec
Difference: 8672 (51%)

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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GeForce GTX 650

Amazon.com

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Radeon HD 7950

Amazon.com

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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 GeForce GTX 650 Radeon HD 7950
Manufacturer nVidia AMD
Year September 2012 January 2012
Code Name GK107 Tahiti Pro
Memory 1024 MB 1536 MB
Core Speed 1058 MHz 800 MHz
Memory Speed 5000 MHz 5000 MHz
Power (Max TDP) 64 watts 200 watts
Bandwidth 80000 MB/sec 240000 MB/sec
Texel Rate 33856 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 384 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 1300 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better 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 the local memory in a second - measured in millions of pixels per second. Pixel rate 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 outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GTX 650

Amazon.com

Check prices at:

Radeon HD 7950

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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