Radeon HD 3650 vs Radeon HD 3690/3830

Intro

Compare those specs to the Radeon HD 3690/3830, which makes use of a 55 nm design. AMD has clocked the core frequency at 668 MHz. The GDDR3 memory works at a frequency of 828 MHz on this particular card. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

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

Performance-wise, the Radeon HD 3690/3830 should in theory be just a bit superior to the Radeon HD 3650 overall. (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 (about 84%) better 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

The Radeon HD 3690/3830 will be quite a bit (more or less 269%) better at anti-aliasing than the Radeon HD 3650, and capable of handling higher screen resolutions without losing too much performance. (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: Memory bandwidth is the max amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.