GeForce GTX 660 Ti vs Radeon R9 M265X

Intro

Compare those specifications to the Radeon R9 M265X, which features a core clock speed of 575 MHz and a GDDR5 memory frequency of 1125 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is comprised of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTX 660 Ti should in theory perform much faster than the Radeon R9 M265X overall. (explain)

GeForce GTX 660 Ti		144000 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 72000 (100%)

Texel Rate

The GeForce GTX 660 Ti should be quite a bit (more or less 346%) more effective at texture filtering than the Radeon R9 M265X. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 79480 (346%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 660 Ti is a better choice, by a large margin. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 12760 (139%)

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 max amount of data (in units of megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.