GeForce 820M vs Radeon HD 3650

Intro

Compare all that to the Radeon HD 3650, which has core speeds of 725 MHz on the GPU, and 800 MHz on the 1024 MB of GDDR4 RAM. It features 120(24x5) SPUs along with 8 Texture Address Units and 4 ROPs.

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

The Radeon HD 3650 should in theory perform much faster than the GeForce 820M overall. (explain)

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

Texel Rate

The GeForce 820M is quite a bit (approximately 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

If using a high screen resolution is important to you, then the Radeon HD 3650 is a better choice, though only just barely. (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: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video 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 most pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.