Radeon HD 3650 512MB vs Radeon HD 6990

Intro

Compare those specs to the Radeon HD 6990, which has a clock frequency of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 256-bit bus, and uses a 40 nm design. It is made up of 1536 SPUs, 96 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 512MB		78 Watts
Radeon HD 6990		375 Watts
	Difference: 297 Watts (381%)

Memory Bandwidth

Theoretically, the Radeon HD 6990 should be quite a bit faster than the Radeon HD 3650 512MB in general. (explain)

Radeon HD 6990		320000 MB/sec
Radeon HD 3650 512MB		25600 MB/sec
	Difference: 294400 (1150%)

Texel Rate

The Radeon HD 6990 is quite a bit (approximately 2648%) better at texture filtering than the Radeon HD 3650 512MB. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon HD 3650 512MB		5800 Mtexels/sec
	Difference: 153560 (2648%)

Pixel Rate

The Radeon HD 6990 should be a lot (about 1732%) faster with regards to full screen anti-aliasing than the Radeon HD 3650 512MB, and able to handle higher resolutions better. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon HD 3650 512MB		2900 Mpixels/sec
	Difference: 50220 (1732%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

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