GeForce GTX 660 vs Radeon R9 390X 8G

Intro

Compare those specs to the Radeon R9 390X 8G, which uses a 28 nm design. AMD has set the core speed at 1050 MHz. The GDDR5 RAM works at a frequency of 1500 MHz on this particular card. It features 2816 SPUs along with 176 Texture Address Units and 64 ROPs.

Display Graphs

Hide Graphs

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 390X 8G		13555 points
GeForce GTX 660		5063 points
	Difference: 8492 (168%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The Radeon R9 390X 8G should theoretically be quite a bit faster than the GeForce GTX 660 overall. (explain)

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

Texel Rate

The Radeon R9 390X 8G will be much (more or less 136%) better at AF than the GeForce GTX 660. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
GeForce GTX 660		78400 Mtexels/sec
	Difference: 106400 (136%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 390X 8G is superior to the GeForce GTX 660, and very much so. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
GeForce GTX 660		23520 Mpixels/sec
	Difference: 43680 (186%)

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 data (measured in MB per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 amount of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount 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 calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.