GeForce 820M vs Radeon R9 M295X

Intro

Compare all of that to the Radeon R9 M295X, which features a core clock frequency of 750 MHz and a GDDR5 memory speed of 1375 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon R9 M295X		125 Watts
	Difference: 110 Watts (733%)

Memory Bandwidth

In theory, the Radeon R9 M295X should be much faster than the GeForce 820M in general. (explain)

Radeon R9 M295X		176000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 160000 (1000%)

Texel Rate

The Radeon R9 M295X will be much (more or less 734%) faster with regards to AF than the GeForce 820M. (explain)

Radeon R9 M295X		96000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 84496 (734%)

Pixel Rate

The Radeon R9 M295X should be much (more or less 734%) more effective at AA than the GeForce 820M, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 M295X		24000 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 21124 (734%)

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 maximum amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it 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 higher screen resolutions.

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