GeForce GTX 275 vs GeForce GTX 650

Intro

Compare those specifications to the GeForce GTX 650, which has a GPU core clock speed of 1058 MHz, and 1024 MB of GDDR5 RAM set to run at 1250 MHz through a 128-bit bus. It also features 384 SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GTX 275		219 Watts
	Difference: 155 Watts (242%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 275 will be 59% faster than the GeForce GTX 650 in general, because of its greater bandwidth. (explain)

GeForce GTX 275		127008 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 47008 (59%)

Texel Rate

The GeForce GTX 275 should be a lot (more or less 50%) better at anisotropic filtering than the GeForce GTX 650. (explain)

GeForce GTX 275		50640 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 16784 (50%)

Pixel Rate

The GeForce GTX 275 should be a little bit (more or less 5%) better at full screen anti-aliasing than the GeForce GTX 650, and should be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 275		17724 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 796 (5%)

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

Specifications

Memory Bandwidth: Bandwidth is the largest amount of data (in units of megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the 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 4 instead. The better the bandwidth is, the better 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 number of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.