GeForce GTX 285 2GB vs Radeon R9 380 4G

Intro

Compare that to the Radeon R9 380 4G, which features a GPU core clock speed of 970 MHz, and 4096 MB of GDDR5 memory set to run at 1425 MHz through a 256-bit bus. It also is comprised of 1792 SPUs, 112 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380 4G		190 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 14 Watts (7%)

Memory Bandwidth

In theory, the Radeon R9 380 4G should perform just a bit faster than the GeForce GTX 285 2GB overall. (explain)

Radeon R9 380 4G		182400 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 23424 (15%)

Texel Rate

The Radeon R9 380 4G should be a lot (about 110%) better at AF than the GeForce GTX 285 2GB. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 56800 (110%)

Pixel Rate

The Radeon R9 380 4G will be much (more or less 50%) faster with regards to AA than the GeForce GTX 285 2GB, and capable of handling higher resolutions while still performing well. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 10304 (50%)

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 transferred past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 applied per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.