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GeForce GTX 650 vs Radeon HD 7950 3GB

Intro

The GeForce GTX 650 has a GPU clock speed of 1058 MHz, and the 1024 MB of GDDR5 memory is set to run at 1250 MHz through a 128-bit bus. It also features 384 SPUs, 32 Texture Address Units, and 16 ROPs.

Compare all that to the Radeon HD 7950 3GB, which uses a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 memory runs at a speed of 1250 MHz on this particular card. It features 1792 SPUs along with 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

As far as performance goes, the Radeon HD 7950 3GB should theoretically be a lot better than the GeForce GTX 650 in general. (explain)

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

Texel Rate

The Radeon HD 7950 3GB is quite a bit (approximately 165%) faster with regards to anisotropic filtering than the GeForce GTX 650. (explain)

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

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 7950 3GB is a better choice, and very much so. (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 max amount of data (measured in megabytes per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max 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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