GeForce 820M vs Radeon R9 M280X

Intro

Compare those specifications to the Radeon R9 M280X, which comes with a core clock frequency of 900 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 896 SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon R9 M280X		75 Watts
	Difference: 60 Watts (400%)

Memory Bandwidth

Theoretically, the Radeon R9 M280X should perform much faster than the GeForce 820M overall. (explain)

Radeon R9 M280X		88000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 72000 (450%)

Texel Rate

The Radeon R9 M280X should be quite a bit (approximately 338%) faster with regards to AF than the GeForce 820M. (explain)

Radeon R9 M280X		50400 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 38896 (338%)

Pixel Rate

The Radeon R9 M280X should be a lot (about 401%) better at full screen anti-aliasing than the GeForce 820M, and will be able to handle higher resolutions more effectively. (explain)

Radeon R9 M280X		14400 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 11524 (401%)

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 max amount of data (measured in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics 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 number of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.