GeForce GTX 660 vs Radeon R9 380X

Intro

Compare those specs to the Radeon R9 380X, which features core 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

As far as performance goes, the Radeon R9 380X should in theory be much superior to 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 will be much (about 58%) faster with regards to AF than the GeForce GTX 660. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 380X is the winner, and very much so. (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 largest amount of data (measured in MB per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the bus 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 ANOTHER 2x. The better 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 texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the video 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 maximum number of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.