GeForce 820M vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which features a core clock speed of 750 MHz and a GDDR5 memory speed of 1375 MHz. It also makes use of a 256-bit memory bus, and uses 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

As far as performance goes, the Radeon R9 M295X should in theory be a lot superior to the GeForce 820M overall. (explain)

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

Texel Rate

The Radeon R9 M295X will be a lot (approximately 734%) better at anisotropic filtering than the GeForce 820M. (explain)

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

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 M295X is superior to the GeForce 820M, by far. (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: Bandwidth is the max amount of data (in units of MB per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units 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 output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.