GeForce GT 320 vs GeForce GTX 650

Intro

Compare that to the GeForce GTX 650, which comes with a core clock speed of 1058 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is made up of 384 SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
GeForce GTX 650		64 Watts
	Difference: 21 Watts (49%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 650 will be 216% faster than the GeForce GT 320 in general, due to its greater data rate. (explain)

GeForce GTX 650		80000 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 54720 (216%)

Texel Rate

The GeForce GTX 650 is a lot (about 161%) faster with regards to AF than the GeForce GT 320. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 20896 (161%)

Pixel Rate

The GeForce GTX 650 will be quite a bit (more or less 292%) faster with regards to AA than the GeForce GT 320, and will be able to handle higher resolutions better. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 12608 (292%)

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: Memory bandwidth is the largest amount of data (in units of MB per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.