GeForce GTX 285 2GB vs Radeon R9 390X 8G

Intro

Compare those specifications to the Radeon R9 390X 8G, which has a clock frequency of 1050 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 512-bit bus, and uses a 28 nm design. It is made up of 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 2GB		204 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 71 Watts (35%)

Memory Bandwidth

In theory, the Radeon R9 390X 8G should be 142% quicker than the GeForce GTX 285 2GB overall, due to its higher data rate. (explain)

Radeon R9 390X 8G		384000 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 225024 (142%)

Texel Rate

The Radeon R9 390X 8G is quite a bit (about 256%) better at AF than the GeForce GTX 285 2GB. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 132960 (256%)

Pixel Rate

The Radeon R9 390X 8G should be a lot (more or less 224%) more effective at anti-aliasing than the GeForce GTX 285 2GB, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
GeForce GTX 285 2GB		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 max amount of information (counted in MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics 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 number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.