GeForce 9400 GT 256MB vs GeForce GTX 750

Intro

Compare all that to the GeForce GTX 750, which features a clock frequency of 1020 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 128-bit memory bus, and makes use of a 28 nm design. It features 512 SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB		50 Watts
GeForce GTX 750		55 Watts
	Difference: 5 Watts (10%)

Memory Bandwidth

Theoretically, the GeForce GTX 750 should be much faster than the GeForce 9400 GT 256MB in general. (explain)

GeForce GTX 750		80000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 67200 (525%)

Texel Rate

The GeForce GTX 750 should be quite a bit (more or less 642%) faster with regards to anisotropic filtering than the GeForce 9400 GT 256MB. (explain)

GeForce GTX 750		32640 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 28240 (642%)

Pixel Rate

The GeForce GTX 750 will be quite a bit (approximately 642%) more effective at full screen anti-aliasing than the GeForce 9400 GT 256MB, and should be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 750		16320 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 14120 (642%)

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 (counted in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 applied per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics 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 most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka 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 max fill rate.