Radeon HD 4550 256MB vs Radeon HD 7790

Intro

Compare those specifications to the Radeon HD 7790, which has 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 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 256MB		25 Watts
Radeon HD 7790		85 Watts
	Difference: 60 Watts (240%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7790 should theoretically be quite a bit better than the Radeon HD 4550 256MB overall. (explain)

Radeon HD 7790		96000 MB/sec
Radeon HD 4550 256MB		12800 MB/sec
	Difference: 83200 (650%)

Texel Rate

The Radeon HD 7790 will be quite a bit (approximately 1067%) more effective at AF than the Radeon HD 4550 256MB. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 4550 256MB		4800 Mtexels/sec
	Difference: 51200 (1067%)

Pixel Rate

The Radeon HD 7790 should be a lot (about 567%) faster with regards to FSAA than the Radeon HD 4550 256MB, and also capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 4550 256MB		2400 Mpixels/sec
	Difference: 13600 (567%)

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 max amount of information (in units of MB per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen 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 number of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.