GeForce GTX 285 1GB vs Radeon R9 390 8G

Intro

Compare those specifications to the Radeon R9 390 8G, which makes use of a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM runs at a frequency of 1500 MHz on this particular card. It features 2560 SPUs along with 160 TAUs 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 390 8G		275 Watts
	Difference: 71 Watts (35%)

Memory Bandwidth

The Radeon R9 390 8G should in theory be quite a bit faster than the GeForce GTX 285 1GB in general. (explain)

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

Texel Rate

The Radeon R9 390 8G should be quite a bit (more or less 209%) faster with regards to anisotropic filtering than the GeForce GTX 285 1GB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 108160 (209%)

Pixel Rate

The Radeon R9 390 8G should be quite a bit (more or less 209%) more effective at FSAA than the GeForce GTX 285 1GB, and also able to handle higher resolutions more effectively. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
GeForce GTX 285 1GB		20736 Mpixels/sec
	Difference: 43264 (209%)

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 data (in units of MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 applied in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. 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 of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.