GeForce 9800 GTX vs Geforce GTX 780

Intro

Compare all that to the Geforce GTX 780, which has a GPU core clock speed of 863 MHz, and 3072 MB of GDDR5 memory set to run at 1502 MHz through a 384-bit bus. It also is made up of 2304 SPUs, 192 TAUs, and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GTX		140 Watts
Geforce GTX 780		250 Watts
	Difference: 110 Watts (79%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 780 should be 310% faster than the GeForce 9800 GTX overall, due to its higher bandwidth. (explain)

Geforce GTX 780		288384 MB/sec
GeForce 9800 GTX		70400 MB/sec
	Difference: 217984 (310%)

Texel Rate

The Geforce GTX 780 will be quite a bit (more or less 284%) better at texture filtering than the GeForce 9800 GTX. (explain)

Geforce GTX 780		165696 Mtexels/sec
GeForce 9800 GTX		43200 Mtexels/sec
	Difference: 122496 (284%)

Pixel Rate

The Geforce GTX 780 is a lot (more or less 284%) more effective at FSAA than the GeForce 9800 GTX, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

Geforce GTX 780		41424 Mpixels/sec
GeForce 9800 GTX		10800 Mpixels/sec
	Difference: 30624 (284%)

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 largest amount of information (measured in megabytes per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock 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 lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.