GeForce 9800 GTX vs Geforce GTX 780

Intro

Compare all that to the Geforce GTX 780, which uses a 28 nm design. nVidia has clocked the core speed at 863 MHz. The GDDR5 RAM runs at a frequency of 1502 MHz on this card. It features 2304 SPUs along with 192 TAUs and 48 ROPs.

Display Graphs

Hide Graphs

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 much faster than the GeForce 9800 GTX overall. (explain)

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

Texel Rate

The Geforce GTX 780 is 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 should be much (more or less 284%) better at FSAA than the GeForce 9800 GTX, and should be able to handle higher screen resolutions while still performing well. (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 max amount of data (measured in MB per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.