GeForce 9400 GT 256MB vs GeForce GTX 650

Intro

Compare those specifications to the GeForce GTX 650, which comes with a core clock frequency of 1058 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It features 384 SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

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 in theory be much 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 much (about 669%) more effective 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

If running with a high screen resolution is important to you, then the GeForce GTX 650 is superior to the GeForce 9400 GT 256MB, by a large margin. (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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of 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 clock speed of the chip. The higher this number, the better the video card will be at 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 write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.