GeForce GTX 275 vs Radeon R9 390 8G

Intro

Compare that to the Radeon R9 390 8G, which comes with core speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2560 SPUs as well as 160 Texture Address Units and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 275		219 Watts
Radeon R9 390 8G		275 Watts
	Difference: 56 Watts (26%)

Memory Bandwidth

The Radeon R9 390 8G should in theory be quite a bit faster than the GeForce GTX 275 in general. (explain)

Radeon R9 390 8G		384000 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 256992 (202%)

Texel Rate

The Radeon R9 390 8G should be a lot (about 216%) better at anisotropic filtering than the GeForce GTX 275. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 109360 (216%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 390 8G is a better choice, and very much so. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 46276 (261%)

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 data (measured in MB per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics 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 ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.