Radeon HD 4830 1GB vs Radeon HD 7790

Intro

Compare all of that to the Radeon HD 7790, which makes use of a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this specific card. It features 896 SPUs along with 56 TAUs and 16 ROPs.

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

The Radeon HD 7790 should theoretically be quite a bit faster than the Radeon HD 4830 1GB in general. (explain)

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

Texel Rate

The Radeon HD 7790 is quite a bit (more or less 204%) better at AF 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

If running with a high screen resolution is important to you, then the Radeon HD 7790 is a better choice, by a large margin. (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 maximum amount of information (in units of megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. 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 output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.