GeForce GTX 660 vs Radeon R9 390 8G

Intro

Compare all that to the Radeon R9 390 8G, which comes with a GPU core clock speed of 1000 MHz, and 8192 MB of GDDR5 memory running at 1500 MHz through a 512-bit bus. It also is comprised of 2560 Stream Processors, 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

The Radeon R9 390 8G should theoretically perform quite a bit faster than the GeForce GTX 660 overall. (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 much (approximately 104%) faster with regards to 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 using a high resolution 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 megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.