GeForce GTS 250 1GB vs Geforce GTX 780

Intro

Compare that to the Geforce GTX 780, which has a clock speed of 863 MHz and a GDDR5 memory frequency of 1502 MHz. It also makes use of a 384-bit memory bus, and uses a 28 nm design. It features 2304 SPUs, 192 Texture Address Units, and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 250 1GB		145 Watts
Geforce GTX 780		250 Watts
	Difference: 105 Watts (72%)

Memory Bandwidth

The Geforce GTX 780 should in theory perform quite a bit faster than the GeForce GTS 250 1GB in general. (explain)

Geforce GTX 780		288384 MB/sec
GeForce GTS 250 1GB		70400 MB/sec
	Difference: 217984 (310%)

Texel Rate

The Geforce GTX 780 is quite a bit (about 251%) faster with regards to AF than the GeForce GTS 250 1GB. (explain)

Geforce GTX 780		165696 Mtexels/sec
GeForce GTS 250 1GB		47232 Mtexels/sec
	Difference: 118464 (251%)

Pixel Rate

The Geforce GTX 780 should be much (more or less 251%) faster with regards to AA than the GeForce GTS 250 1GB, and able to handle higher screen resolutions more effectively. (explain)

Geforce GTX 780		41424 Mpixels/sec
GeForce GTS 250 1GB		11808 Mpixels/sec
	Difference: 29616 (251%)

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 max amount of data (counted in MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.