Radeon HD 4650 1GB vs Radeon HD 6790

Intro

Compare that to the Radeon HD 6790, which comes with core speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Radeon HD 6790		150 Watts
	Difference: 95 Watts (173%)

Memory Bandwidth

In theory, the Radeon HD 6790 should perform quite a bit faster than the Radeon HD 4650 1GB in general. (explain)

Radeon HD 6790		134400 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 112000 (500%)

Texel Rate

The Radeon HD 6790 will be a lot (more or less 75%) better at texture filtering than the Radeon HD 4650 1GB. (explain)

Radeon HD 6790		33600 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 14400 (75%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6790 is superior to the Radeon HD 4650 1GB, and very much so. (explain)

Radeon HD 6790		13440 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 8640 (180%)

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 largest amount of information (counted in megabytes per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, 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 maximum amount of pixels the video card can possibly record to its local memory per 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 - sometimes also referred to as 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, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.