GeForce 8800 GT 256MB vs Geforce GTX 780

Intro

Compare that to the Geforce GTX 780, which has a clock speed of 863 MHz and a GDDR5 memory speed of 1502 MHz. It also features a 384-bit bus, and uses a 28 nm design. It is made up of 2304 SPUs, 192 TAUs, and 48 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GT 256MB		105 Watts
Geforce GTX 780		250 Watts
	Difference: 145 Watts (138%)

Memory Bandwidth

In theory, the Geforce GTX 780 is 544% quicker than the GeForce 8800 GT 256MB in general, because of its higher data rate. (explain)

Geforce GTX 780		288384 MB/sec
GeForce 8800 GT 256MB		44800 MB/sec
	Difference: 243584 (544%)

Texel Rate

The Geforce GTX 780 should be a lot (more or less 393%) better at AF than the GeForce 8800 GT 256MB. (explain)

Geforce GTX 780		165696 Mtexels/sec
GeForce 8800 GT 256MB		33600 Mtexels/sec
	Difference: 132096 (393%)

Pixel Rate

The Geforce GTX 780 is much (more or less 332%) more effective at FSAA than the GeForce 8800 GT 256MB, and also will be capable of handling higher resolutions more effectively. (explain)

Geforce GTX 780		41424 Mpixels/sec
GeForce 8800 GT 256MB		9600 Mpixels/sec
	Difference: 31824 (332%)

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 maximum amount of information (measured in megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.