GeForce 9400 GT 256MB vs GeForce GTX 650

Intro

Compare that to the GeForce GTX 650, which comes with core clock speeds of 1058 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 RAM. It features 384 SPUs along with 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 650		64 Watts
	Difference: 14 Watts (28%)

Memory Bandwidth

The GeForce GTX 650 should theoretically perform quite a bit faster than the GeForce 9400 GT 256MB in general. (explain)

GeForce GTX 650		80000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 67200 (525%)

Texel Rate

The GeForce GTX 650 should be quite a bit (approximately 669%) better at anisotropic filtering than the GeForce 9400 GT 256MB. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 29456 (669%)

Pixel Rate

The GeForce GTX 650 is much (more or less 669%) faster with regards to full screen anti-aliasing than the GeForce 9400 GT 256MB, and capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 14728 (669%)

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 max amount of data (counted in MB per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.