GeForce 9800 GTX vs GeForce GTX 750 Ti

Intro

Compare those specs to the GeForce GTX 750 Ti, which comes with a clock frequency of 1020 MHz and a GDDR5 memory frequency of 1350 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 750 Ti		60 Watts
GeForce 9800 GTX		140 Watts
	Difference: 80 Watts (133%)

Memory Bandwidth

Performance-wise, the GeForce GTX 750 Ti should in theory be much better than the GeForce 9800 GTX overall. (explain)

GeForce GTX 750 Ti		86400 MB/sec
GeForce 9800 GTX		70400 MB/sec
	Difference: 16000 (23%)

Texel Rate

The GeForce 9800 GTX is a bit (about 6%) more effective at anisotropic filtering than the GeForce GTX 750 Ti. (explain)

GeForce 9800 GTX		43200 Mtexels/sec
GeForce GTX 750 Ti		40800 Mtexels/sec
	Difference: 2400 (6%)

Pixel Rate

The GeForce GTX 750 Ti is much (about 51%) better at AA than the GeForce 9800 GTX, and should be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 750 Ti		16320 Mpixels/sec
GeForce 9800 GTX		10800 Mpixels/sec
	Difference: 5520 (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

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many 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.