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GeForce GTX 650 vs Radeon HD 7950 3GB

Intro

The GeForce GTX 650 features a GPU clock speed of 1058 MHz, and the 1024 MB of GDDR5 memory runs at 1250 MHz through a 128-bit bus. It also features 384 Stream Processors, 32 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 7950 3GB, which makes use of a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 memory runs at a frequency of 1250 MHz on this model. It features 1792 SPUs as well as 112 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 7950 3GB 200 Watts
Difference: 136 Watts (213%)

Memory Bandwidth

In theory, the Radeon HD 7950 3GB should be 200% quicker than the GeForce GTX 650 overall, due to its higher data rate. (explain)

Radeon HD 7950 3GB 240000 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 160000 (200%)

Texel Rate

The Radeon HD 7950 3GB will be quite a bit (more or less 165%) better at AF than the GeForce GTX 650. (explain)

Radeon HD 7950 3GB 89600 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 55744 (165%)

Pixel Rate

The Radeon HD 7950 3GB will be a lot (more or less 51%) more effective at anti-aliasing than the GeForce GTX 650, and will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 7950 3GB 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

Check prices at:

Radeon HD 7950 3GB

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.

Specifications

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Model GeForce GTX 650 Radeon HD 7950 3GB
Manufacturer nVidia AMD
Year September 2012 January 2012
Code Name GK107 Tahiti Pro
Memory 1024 MB 3072 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: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once 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 amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 650

Amazon.com

Check prices at:

Radeon HD 7950 3GB

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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