GeForce 8400 GS 512MB vs GeForce GTX 750 Ti

Intro

Compare all of that to the GeForce GTX 750 Ti, which makes use of a 28 nm design. nVidia has set the core speed at 1020 MHz. The GDDR5 memory is set to run at a speed of 1350 MHz on this specific model. It features 640 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

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

Theoretically speaking, the GeForce GTX 750 Ti should be 1250% faster than the GeForce 8400 GS 512MB overall, due to its higher bandwidth. (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 quite a bit (approximately 685%) better at anisotropic filtering 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

If running with high levels of AA is important to you, then the GeForce GTX 750 Ti is the winner, and very much so. (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: Memory bandwidth is the maximum amount of information (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 speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video 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 the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.