GeForce GTX 660 vs Radeon R9 380X

Intro

Compare all of that to the Radeon R9 380X, which features clock speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 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 R9 380X		9519 points
GeForce GTX 660		5063 points
	Difference: 4456 (88%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
Radeon R9 380X		190 Watts
	Difference: 50 Watts (36%)

Memory Bandwidth

Theoretically, the Radeon R9 380X should perform much faster than the GeForce GTX 660 in general. (explain)

Radeon R9 380X		182400 MB/sec
GeForce GTX 660		144192 MB/sec
	Difference: 38208 (26%)

Texel Rate

The Radeon R9 380X should be a lot (approximately 58%) faster with regards to texture filtering than the GeForce GTX 660. (explain)

Radeon R9 380X		124160 Mtexels/sec
GeForce GTX 660		78400 Mtexels/sec
	Difference: 45760 (58%)

Pixel Rate

The Radeon R9 380X will be quite a bit (approximately 32%) faster with regards to full screen anti-aliasing than the GeForce GTX 660, and also able to handle higher screen resolutions while still performing well. (explain)

Radeon R9 380X		31040 Mpixels/sec
GeForce GTX 660		23520 Mpixels/sec
	Difference: 7520 (32%)

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 transferred past the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units 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 fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.