Radeon HD 3650 vs Radeon HD 3690/3830

Intro

Compare all of that to the Radeon HD 3690/3830, which makes use of a 55 nm design. AMD has clocked the core speed at 668 MHz. The GDDR3 RAM works at a frequency of 828 MHz on this particular model. It features 320(64x5) SPUs along with 16 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3690/3830		75 Watts
Radeon HD 3650		78 Watts
	Difference: 3 Watts (4%)

Memory Bandwidth

In theory, the Radeon HD 3690/3830 is 4% faster than the Radeon HD 3650 overall, due to its higher bandwidth. (explain)

Radeon HD 3690/3830		26496 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 896 (4%)

Texel Rate

The Radeon HD 3690/3830 is quite a bit (more or less 84%) more effective at AF than the Radeon HD 3650. (explain)

Radeon HD 3690/3830		10688 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 4888 (84%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 3690/3830 is the winner, and very much so. (explain)

Radeon HD 3690/3830		10688 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 7788 (269%)

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 (measured in megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.