GeForce 9400 GT 256MB vs GeForce GTX 750

Intro

Compare those specs to the GeForce GTX 750, which has core clock speeds of 1020 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 RAM. It features 512 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

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

Performance-wise, the GeForce GTX 750 should theoretically be quite a bit better than the GeForce 9400 GT 256MB overall. (explain)

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

Texel Rate

The GeForce GTX 750 will be a lot (approximately 642%) more effective at 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 should be much (more or less 642%) faster with regards to FSAA than the GeForce 9400 GT 256MB, and also should be able to handle higher resolutions better. (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: Bandwidth is the max amount of data (measured in MB per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 number of texture map elements (texels) that are applied in one second. This number 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock 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 lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.