Radeon HD 4830 1GB vs Radeon HD 7790

Intro

Compare that to the Radeon HD 7790, which features core clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 memory. It features 896 SPUs along with 56 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 10 Watts (12%)

Memory Bandwidth

In theory, the Radeon HD 7790 will be 67% faster than the Radeon HD 4830 1GB in general, due to its higher bandwidth. (explain)

Radeon HD 7790		96000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 38400 (67%)

Texel Rate

The Radeon HD 7790 will be quite a bit (approximately 204%) more effective at texture filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 37600 (204%)

Pixel Rate

The Radeon HD 7790 should be much (more or less 74%) more effective at FSAA than the Radeon HD 4830 1GB, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 6800 (74%)

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: Bandwidth is the max amount of data (in units of megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total number of texture units by the core 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 one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units 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 fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.