Radeon HD 3650 vs Radeon HD 7990

Intro

Compare that to the Radeon HD 7990, which uses a 28 nm design. AMD has set the core frequency at 950 MHz. The GDDR5 RAM works at a speed of 1500 MHz on this card. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650		78 Watts
Radeon HD 7990		375 Watts
	Difference: 297 Watts (381%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should in theory be much superior to the Radeon HD 3650 overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 550400 (2150%)

Texel Rate

The Radeon HD 7990 is quite a bit (about 4093%) better at anisotropic filtering than the Radeon HD 3650. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 237400 (4093%)

Pixel Rate

The Radeon HD 7990 will be a lot (about 1997%) better at AA than the Radeon HD 3650, and able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 57900 (1997%)

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: Memory bandwidth is the largest amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that are processed 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 the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.