GeForce 9400 GT 256MB vs GeForce GTX 570

Intro

Compare all of that to the GeForce GTX 570, which has a clock speed of 732 MHz and a GDDR5 memory speed of 950 MHz. It also uses a 320-bit bus, and uses a 40 nm design. It is comprised of 480 SPUs, 60 TAUs, and 40 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB		50 Watts
GeForce GTX 570		219 Watts
	Difference: 169 Watts (338%)

Memory Bandwidth

The GeForce GTX 570 should in theory be much faster than the GeForce 9400 GT 256MB in general. (explain)

GeForce GTX 570		152000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 139200 (1088%)

Texel Rate

The GeForce GTX 570 is quite a bit (more or less 898%) faster with regards to AF than the GeForce 9400 GT 256MB. (explain)

GeForce GTX 570		43920 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 39520 (898%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 570 is superior to the GeForce 9400 GT 256MB, by a large margin. (explain)

GeForce GTX 570		29280 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 27080 (1231%)

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 data (measured in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 processed per second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.