GeForce 8400 GS 512MB vs GeForce GTX 750 Ti

Intro

Compare all that to the GeForce GTX 750 Ti, which has core clock speeds of 1020 MHz on the GPU, and 1350 MHz on the 2048 MB of GDDR5 RAM. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
GeForce GTX 750 Ti		60 Watts
	Difference: 20 Watts (50%)

Memory Bandwidth

The GeForce GTX 750 Ti should theoretically be a lot faster than the GeForce 8400 GS 512MB in general. (explain)

GeForce GTX 750 Ti		86400 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 80000 (1250%)

Texel Rate

The GeForce GTX 750 Ti should be a lot (more or less 685%) better at AF than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 750 Ti		40800 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 35600 (685%)

Pixel Rate

The GeForce GTX 750 Ti is quite a bit (approximately 528%) faster with regards to FSAA than the GeForce 8400 GS 512MB, and also able to handle higher screen resolutions better. (explain)

GeForce GTX 750 Ti		16320 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 13720 (528%)

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 maximum amount of information (measured in megabytes per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once 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 anti-aliasing, HDR and higher screen resolutions.

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

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