GeForce GTX 460 1GB vs Radeon R9 390 8G

Intro

Compare that to the Radeon R9 390 8G, which has GPU clock speed of 1000 MHz, and 8192 MB of GDDR5 RAM running at 1500 MHz through a 512-bit bus. It also features 2560 Stream Processors, 160 TAUs, 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 speaking, 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 will be much (about 323%) more effective at AF 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 should be a lot (about 196%) better at FSAA than the GeForce GTX 460 1GB, and should be able to handle higher screen 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 max amount of data (measured in MB per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on 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 potential to get to the maximum fill rate.