GeForce 820M vs Radeon HD 5450

Intro

Compare those specs to the Radeon HD 5450, which uses a 40 nm design. AMD has clocked the core speed at 650 MHz. The DDR3 RAM runs at a speed of 800 MHz on this particular card. It features 80(16x5) 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 5450		19 Watts
	Difference: 4 Watts (27%)

Memory Bandwidth

As far as performance goes, the GeForce 820M should theoretically be quite a bit superior to the Radeon HD 5450 in general. (explain)

GeForce 820M		16000 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 3200 (25%)

Texel Rate

The GeForce 820M should be a lot (about 121%) faster with regards to texture filtering than the Radeon HD 5450. (explain)

GeForce 820M		11504 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 6304 (121%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce 820M is superior to the Radeon HD 5450, but not by far. (explain)

GeForce 820M		2876 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 276 (11%)

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 (counted in megabytes per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units 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 applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few 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.