GeForce GTX 650 Ti 2GB vs GeForce GTX 980

Intro

Compare those specifications to the GeForce GTX 980, which comes with GPU clock speed of 1126 MHz, and 4096 MB of GDDR5 RAM running at 1750 MHz through a 256-bit bus. It also features 2048 Stream Processors, 128 TAUs, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti 2GB		110 Watts
GeForce GTX 980		165 Watts
	Difference: 55 Watts (50%)

Memory Bandwidth

In theory, the GeForce GTX 980 is 159% faster than the GeForce GTX 650 Ti 2GB in general, because of its higher bandwidth. (explain)

GeForce GTX 980		224000 MB/sec
GeForce GTX 650 Ti 2GB		86400 MB/sec
	Difference: 137600 (159%)

Texel Rate

The GeForce GTX 980 is a lot (approximately 143%) faster with regards to texture filtering than the GeForce GTX 650 Ti 2GB. (explain)

GeForce GTX 980		144128 Mtexels/sec
GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
	Difference: 84736 (143%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 980 is a better choice, by a large margin. (explain)

GeForce GTX 980		72064 Mpixels/sec
GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
	Difference: 57216 (385%)

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 data (measured in megabytes per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. 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 is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.