Geforce GTX 780 vs Radeon R9 M275X

Intro

Compare all that to the Radeon R9 M275X, which features clock speeds of 900 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 memory. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Geforce GTX 780		250 Watts
	Difference: 200 Watts (400%)

Memory Bandwidth

The Geforce GTX 780 should theoretically perform much faster than the Radeon R9 M275X in general. (explain)

Geforce GTX 780		288384 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 216384 (301%)

Texel Rate

The Geforce GTX 780 is much (about 360%) faster with regards to anisotropic filtering than the Radeon R9 M275X. (explain)

Geforce GTX 780		165696 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 129696 (360%)

Pixel Rate

If running with a high screen resolution is important to you, then the Geforce GTX 780 is a better choice, and very much so. (explain)

Geforce GTX 780		41424 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 27024 (188%)

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 data (measured in MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.