GeForce GTX 285 1GB vs Radeon R9 390X 8G

Intro

Compare those specs to the Radeon R9 390X 8G, which comes with a GPU core clock speed of 1050 MHz, and 8192 MB of GDDR5 RAM running at 1500 MHz through a 512-bit bus. It also features 2816 SPUs, 176 TAUs, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 285 1GB		204 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 71 Watts (35%)

Memory Bandwidth

In theory, the Radeon R9 390X 8G is 142% quicker than the GeForce GTX 285 1GB in general, because of its higher data rate. (explain)

Radeon R9 390X 8G		384000 MB/sec
GeForce GTX 285 1GB		158976 MB/sec
	Difference: 225024 (142%)

Texel Rate

The Radeon R9 390X 8G will be quite a bit (approximately 256%) more effective at texture filtering than the GeForce GTX 285 1GB. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 132960 (256%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 390X 8G is the winner, and very much so. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
GeForce GTX 285 1GB		20736 Mpixels/sec
	Difference: 46464 (224%)

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: Memory bandwidth is the largest amount of information (counted in MB per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 texture map elements (texels) that are applied per second. This is worked out by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics 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 maximum number of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated 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 outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.