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

Intro

Compare all that to the Radeon R9 390X 8G, which comes with clock speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2816 SPUs as well as 176 Texture Address Units and 64 Rasterization Operator 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 will be 142% faster than the GeForce GTX 285 1GB in general, due to its higher bandwidth. (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 is quite a bit (more or less 256%) faster with regards to AF 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 a high resolution is important to you, then the Radeon R9 390X 8G is a better choice, 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 maximum amount of information (counted in MB per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total number 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 one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines 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, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.