GeForce GTX 660 vs Radeon R7 250X 2GB

Intro

Compare all that to the Radeon R7 250X 2GB, which has a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
GeForce GTX 660		140 Watts
	Difference: 45 Watts (47%)

Memory Bandwidth

Theoretically, the GeForce GTX 660 should be quite a bit faster than the Radeon R7 250X 2GB overall. (explain)

GeForce GTX 660		144192 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 72192 (100%)

Texel Rate

The GeForce GTX 660 is a lot (approximately 96%) better at texture filtering than the Radeon R7 250X 2GB. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 38400 (96%)

Pixel Rate

The GeForce GTX 660 is much (more or less 47%) faster with regards to FSAA than the Radeon R7 250X 2GB, and also capable of handling higher screen resolutions better. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 7520 (47%)

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 information (in units of megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.