GeForce 9800 GT 512MB vs GeForce GTX 750 Ti

Intro

Compare all of that to the GeForce GTX 750 Ti, which comes with GPU core speed of 1020 MHz, and 2048 MB of GDDR5 memory running at 1350 MHz through a 128-bit bus. It also features 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 750 Ti		60 Watts
GeForce 9800 GT 512MB		105 Watts
	Difference: 45 Watts (75%)

Memory Bandwidth

In theory, the GeForce GTX 750 Ti will be 50% faster than the GeForce 9800 GT 512MB in general, due to its higher bandwidth. (explain)

GeForce GTX 750 Ti		86400 MB/sec
GeForce 9800 GT 512MB		57600 MB/sec
	Difference: 28800 (50%)

Texel Rate

The GeForce GTX 750 Ti is much (approximately 21%) faster with regards to anisotropic filtering than the GeForce 9800 GT 512MB. (explain)

GeForce GTX 750 Ti		40800 Mtexels/sec
GeForce 9800 GT 512MB		33600 Mtexels/sec
	Difference: 7200 (21%)

Pixel Rate

The GeForce GTX 750 Ti will be much (about 70%) more effective at full screen anti-aliasing than the GeForce 9800 GT 512MB, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 750 Ti		16320 Mpixels/sec
GeForce 9800 GT 512MB		9600 Mpixels/sec
	Difference: 6720 (70%)

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 transferred past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units of the card by the core clock 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 processed in a second.

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