GeForce GTX 275 vs GeForce GTX 980

Intro

Compare all of that to the GeForce GTX 980, which features a clock frequency of 1126 MHz and a GDDR5 memory speed of 1750 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It is made up of 2048 SPUs, 128 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 980		165 Watts
GeForce GTX 275		219 Watts
	Difference: 54 Watts (33%)

Memory Bandwidth

In theory, the GeForce GTX 980 should perform a lot faster than the GeForce GTX 275 overall. (explain)

GeForce GTX 980		224000 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 96992 (76%)

Texel Rate

The GeForce GTX 980 is much (approximately 185%) faster with regards to AF than the GeForce GTX 275. (explain)

GeForce GTX 980		144128 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 93488 (185%)

Pixel Rate

If running with high levels of AA 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 275		17724 Mpixels/sec
	Difference: 54340 (307%)

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 maximum amount of data (counted in MB per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total amount of texture units 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 applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.