GeForce GTX 285 2GB vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which features a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 79 Watts (63%)

Memory Bandwidth

The Radeon R9 M390X should theoretically perform a bit faster than the GeForce GTX 285 2GB in general. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 1024 (1%)

Texel Rate

The Radeon R9 M390X should be much (approximately 79%) more effective at texture filtering than the GeForce GTX 285 2GB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 40704 (79%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 M390X is a better choice, not by a very large margin though. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 2400 (12%)

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: Bandwidth is the maximum amount of information (in units of MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units by the core 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.