GeForce GTX 660 Ti vs Radeon R7 250X 2GB

Intro

Compare those specs to the Radeon R7 250X 2GB, which features a clock speed of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 55 Watts (58%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 Ti should theoretically be quite a bit superior to the Radeon R7 250X 2GB overall. (explain)

GeForce GTX 660 Ti		144000 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 72000 (100%)

Texel Rate

The GeForce GTX 660 Ti should be quite a bit (approximately 156%) better at anisotropic filtering than the Radeon R7 250X 2GB. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 62480 (156%)

Pixel Rate

The GeForce GTX 660 Ti is a lot (about 37%) faster with regards to AA than the Radeon R7 250X 2GB, and also should be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 5960 (37%)

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 maximum amount of information (measured in megabytes per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. 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 lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.