GeForce GTX 660 Ti vs GeForce GTX 980

Intro

Compare those specifications to the GeForce GTX 980, which features core speeds of 1126 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs along with 128 TAUs and 64 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 980		13552 points
GeForce GTX 660 Ti		6013 points
	Difference: 7539 (125%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti		150 Watts
GeForce GTX 980		165 Watts
	Difference: 15 Watts (10%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980 should be much faster than the GeForce GTX 660 Ti overall. (explain)

GeForce GTX 980		224000 MB/sec
GeForce GTX 660 Ti		144000 MB/sec
	Difference: 80000 (56%)

Texel Rate

The GeForce GTX 980 should be a lot (approximately 41%) better at anisotropic filtering than the GeForce GTX 660 Ti. (explain)

GeForce GTX 980		144128 Mtexels/sec
GeForce GTX 660 Ti		102480 Mtexels/sec
	Difference: 41648 (41%)

Pixel Rate

The GeForce GTX 980 will be a lot (about 228%) better at FSAA than the GeForce GTX 660 Ti, and will be able to handle higher resolutions more effectively. (explain)

GeForce GTX 980		72064 Mpixels/sec
GeForce GTX 660 Ti		21960 Mpixels/sec
	Difference: 50104 (228%)

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 (in units of MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.