Radeon HD 3650 256MB vs Radeon HD 6770 1GB

Intro

Compare all that to the Radeon HD 6770 1GB, which features a core clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 256MB		78 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 30 Watts (38%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 1GB should perform a lot faster than the Radeon HD 3650 256MB overall. (explain)

Radeon HD 6770 1GB		67200 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 41600 (163%)

Texel Rate

The Radeon HD 6770 1GB should be quite a bit (more or less 521%) faster with regards to AF than the Radeon HD 3650 256MB. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 30200 (521%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6770 1GB is a better choice, by a large margin. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon HD 3650 256MB		2900 Mpixels/sec
	Difference: 11500 (397%)

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 data (measured in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once 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 AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. 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 quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.