GeForce GTX 460 1GB vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which features core speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2560 SPUs along with 160 Texture Address Units and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 460 1GB		160 Watts
Radeon R9 390 8G		275 Watts
	Difference: 115 Watts (72%)

Memory Bandwidth

Theoretically, the Radeon R9 390 8G should be much faster than the GeForce GTX 460 1GB overall. (explain)

Radeon R9 390 8G		384000 MB/sec
GeForce GTX 460 1GB		115200 MB/sec
	Difference: 268800 (233%)

Texel Rate

The Radeon R9 390 8G is much (approximately 323%) more effective at texture filtering than the GeForce GTX 460 1GB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
GeForce GTX 460 1GB		37800 Mtexels/sec
	Difference: 122200 (323%)

Pixel Rate

The Radeon R9 390 8G will be a lot (more or less 196%) more effective at anti-aliasing than the GeForce GTX 460 1GB, and also capable of handling higher resolutions more effectively. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
GeForce GTX 460 1GB		21600 Mpixels/sec
	Difference: 42400 (196%)

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 largest amount of data (measured in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock speed of the card. 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 fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.