GeForce GTX 660 vs Radeon RX 580

Intro

Compare those specifications to the Radeon RX 580, which has GPU core speed of 1257 MHz, and 8192 MB of GDDR5 memory running at 2000 MHz through a 256-bit bus. It also is comprised of 2304 Stream Processors, 144 TAUs, and 32 ROPs.

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

Radeon RX 580		13630 points
GeForce GTX 660		5063 points
	Difference: 8567 (169%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
Radeon RX 580		185 Watts
	Difference: 45 Watts (32%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 580 should be a lot faster than the GeForce GTX 660 in general. (explain)

Radeon RX 580		262144 MB/sec
GeForce GTX 660		144192 MB/sec
	Difference: 117952 (82%)

Texel Rate

The Radeon RX 580 is a lot (approximately 131%) faster with regards to anisotropic filtering than the GeForce GTX 660. (explain)

Radeon RX 580		181008 Mtexels/sec
GeForce GTX 660		78400 Mtexels/sec
	Difference: 102608 (131%)

Pixel Rate

The Radeon RX 580 is quite a bit (approximately 71%) more effective at AA than the GeForce GTX 660, and should be capable of handling higher screen resolutions better. (explain)

Radeon RX 580		40224 Mpixels/sec
GeForce GTX 660		23520 Mpixels/sec
	Difference: 16704 (71%)

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 (measured in MB per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that can be applied in one second. This 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 one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core 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 get to the maximum fill rate.