GeForce GTX 660 vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which features a core clock frequency of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 512-bit memory bus, and makes use of a 28 nm design. It features 2560 SPUs, 160 TAUs, and 64 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 390 8G		12733 points
GeForce GTX 660		5063 points
	Difference: 7670 (151%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
Radeon R9 390 8G		275 Watts
	Difference: 135 Watts (96%)

Memory Bandwidth

As far as performance goes, the Radeon R9 390 8G should in theory be quite a bit better than the GeForce GTX 660 in general. (explain)

Radeon R9 390 8G		384000 MB/sec
GeForce GTX 660		144192 MB/sec
	Difference: 239808 (166%)

Texel Rate

The Radeon R9 390 8G will be a lot (approximately 104%) more effective at AF than the GeForce GTX 660. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
GeForce GTX 660		78400 Mtexels/sec
	Difference: 81600 (104%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 390 8G is a better choice, by far. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
GeForce GTX 660		23520 Mpixels/sec
	Difference: 40480 (172%)

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: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.