Radeon HD 3650 vs Radeon HD 5830

Intro

Compare all that to the Radeon HD 5830, which has a clock frequency of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 256-bit bus, and uses a 40 nm design. It is comprised of 1120(224x5) SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650		78 Watts
Radeon HD 5830		175 Watts
	Difference: 97 Watts (124%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5830 will be 400% faster than the Radeon HD 3650 in general, due to its greater data rate. (explain)

Radeon HD 5830		128000 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 102400 (400%)

Texel Rate

The Radeon HD 5830 should be much (approximately 672%) better at AF than the Radeon HD 3650. (explain)

Radeon HD 5830		44800 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 39000 (672%)

Pixel Rate

The Radeon HD 5830 should be quite a bit (more or less 341%) faster with regards to full screen anti-aliasing than the Radeon HD 3650, and also capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 5830		12800 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 9900 (341%)

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

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one 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 colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.