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GeForce GTX 480 vs GeForce GTX 650

Intro

The GeForce GTX 480 features a GPU clock speed of 700 MHz, and the 1536 MB of GDDR5 RAM runs at 924 MHz through a 384-bit bus. It also is comprised of 480 Stream Processors, 60 Texture Address Units, and 48 Raster Operation Units.

Compare all that to the GeForce GTX 650, which makes use of a 28 nm design. nVidia has clocked the core speed at 1058 MHz. The GDDR5 RAM is set to run at a speed of 1250 MHz on this specific model. It features 384 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
GeForce GTX 480 250 Watts
Difference: 186 Watts (291%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 480 should be quite a bit faster than the GeForce GTX 650 in general. (explain)

GeForce GTX 480 177408 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 97408 (122%)

Texel Rate

The GeForce GTX 480 is a lot (about 24%) faster with regards to texture filtering than the GeForce GTX 650. (explain)

GeForce GTX 480 42000 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 8144 (24%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 480 is the winner, by a large margin. (explain)

GeForce GTX 480 33600 Mpixels/sec
GeForce GTX 650 16928 Mpixels/sec
Difference: 16672 (98%)

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 480

Amazon.com

GeForce GTX 650

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 GeForce GTX 480 GeForce GTX 650
Manufacturer nVidia nVidia
Year March 2010 September 2012
Code Name GF100 GK107
Memory 1536 MB 2048 MB
Core Speed 700 MHz 1058 MHz
Memory Speed 3696 MHz 5000 MHz
Power (Max TDP) 250 watts 64 watts
Bandwidth 177408 MB/sec 80000 MB/sec
Texel Rate 42000 Mtexels/sec 33856 Mtexels/sec
Pixel Rate 33600 Mpixels/sec 16928 Mpixels/sec
Unified Shaders 480 384
Texture Mapping Units 60 32
Render Output Units 48 16
Bus Type GDDR5 GDDR5
Bus Width 384-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 3000 million 1300 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.0
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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