GeForce GTX 465 vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which has core clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2560 SPUs as well as 160 TAUs and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 465		200 Watts
Radeon R9 390 8G		275 Watts
	Difference: 75 Watts (38%)

Memory Bandwidth

Theoretically, the Radeon R9 390 8G should be much faster than the GeForce GTX 465 in general. (explain)

Radeon R9 390 8G		384000 MB/sec
GeForce GTX 465		102592 MB/sec
	Difference: 281408 (274%)

Texel Rate

The Radeon R9 390 8G should be a lot (about 499%) more effective at anisotropic filtering than the GeForce GTX 465. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 133292 (499%)

Pixel Rate

The Radeon R9 390 8G should be much (about 229%) faster with regards to AA than the GeForce GTX 465, and able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
GeForce GTX 465		19424 Mpixels/sec
	Difference: 44576 (229%)

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 megabytes per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If 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 high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.