Radeon HD 3650 vs Radeon HD 3870 1GB

Intro

Compare that to the Radeon HD 3870 1GB, which makes use of a 55 nm design. AMD has clocked the core frequency at 775 MHz. The GDDR4 RAM runs at a speed of 1125 MHz on this model. It features 320(64x5) SPUs along with 16 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650		78 Watts
Radeon HD 3870 1GB		106 Watts
	Difference: 28 Watts (36%)

Memory Bandwidth

The Radeon HD 3870 1GB should theoretically perform quite a bit faster than the Radeon HD 3650 in general. (explain)

Radeon HD 3870 1GB		72000 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 46400 (181%)

Texel Rate

The Radeon HD 3870 1GB will be a lot (about 114%) more effective at AF than the Radeon HD 3650. (explain)

Radeon HD 3870 1GB		12400 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 6600 (114%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 3870 1GB is the winner, and very much so. (explain)

Radeon HD 3870 1GB		12400 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 9500 (328%)

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 max amount of information (counted in MB per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.