Radeon HD 5450 vs Radeon HD 7990

Intro

Compare all of that to the Radeon HD 7990, which has a core clock speed of 950 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 384-bit memory bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450		19 Watts
Radeon HD 7990		375 Watts
	Difference: 356 Watts (1874%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should in theory be a lot superior to the Radeon HD 5450 in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 563200 (4400%)

Texel Rate

The Radeon HD 7990 will be much (approximately 4577%) better at texture filtering than the Radeon HD 5450. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 238000 (4577%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7990 is superior to the Radeon HD 5450, by a large margin. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 58200 (2238%)

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: Bandwidth is the largest amount of information (in units of MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units of the card 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount 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 filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.