GeForce 8800 Ultra vs Geforce GTX 780

Intro

Compare all that to the Geforce GTX 780, which comes with a GPU core clock speed of 863 MHz, and 3072 MB of GDDR5 RAM running at 1502 MHz through a 384-bit bus. It also features 2304 Stream Processors, 192 Texture Address Units, and 48 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 Ultra		171 Watts
Geforce GTX 780		250 Watts
	Difference: 79 Watts (46%)

Memory Bandwidth

As far as performance goes, the Geforce GTX 780 should theoretically be a lot better than the GeForce 8800 Ultra overall. (explain)

Geforce GTX 780		288384 MB/sec
GeForce 8800 Ultra		103680 MB/sec
	Difference: 184704 (178%)

Texel Rate

The Geforce GTX 780 will be a lot (approximately 323%) better at anisotropic filtering than the GeForce 8800 Ultra. (explain)

Geforce GTX 780		165696 Mtexels/sec
GeForce 8800 Ultra		39168 Mtexels/sec
	Difference: 126528 (323%)

Pixel Rate

The Geforce GTX 780 will be much (approximately 182%) faster with regards to anti-aliasing than the GeForce 8800 Ultra, and also will be capable of handling higher resolutions more effectively. (explain)

Geforce GTX 780		41424 Mpixels/sec
GeForce 8800 Ultra		14688 Mpixels/sec
	Difference: 26736 (182%)

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 (in units of MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 are processed in one second. This number is worked out by multiplying the total amount of texture units of the card 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core 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 output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.