GeForce 820M vs Radeon HD 3650

Intro

Compare those specs to the Radeon HD 3650, which comes with core speeds of 725 MHz on the GPU, and 800 MHz on the 1024 MB of GDDR4 RAM. It features 120(24x5) SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 3650		78 Watts
	Difference: 63 Watts (420%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3650 should be 60% quicker than the GeForce 820M in general, because of its higher bandwidth. (explain)

Radeon HD 3650		25600 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 9600 (60%)

Texel Rate

The GeForce 820M should be a lot (about 98%) better at AF than the Radeon HD 3650. (explain)

GeForce 820M		11504 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 5704 (98%)

Pixel Rate

The Radeon HD 3650 should be just a bit (approximately 1%) better at full screen anti-aliasing than the GeForce 820M, and will be capable of handling higher resolutions better. (explain)

Radeon HD 3650		2900 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 24 (1%)

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 largest amount of data (in units of MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units 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 fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.