GeForce GTX 275 vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which has core speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
GeForce GTX 275		219 Watts
	Difference: 94 Watts (75%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M390X should in theory be much better than the GeForce GTX 275 in general. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 32992 (26%)

Texel Rate

The Radeon R9 M390X should be quite a bit (more or less 83%) better at texture filtering than the GeForce GTX 275. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 41904 (83%)

Pixel Rate

The Radeon R9 M390X will be quite a bit (approximately 31%) faster with regards to full screen anti-aliasing than the GeForce GTX 275, and also should be capable of handling higher resolutions while still performing well. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 5412 (31%)

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 largest amount of information (in units of megabytes per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.