Radeon HD 4350 vs Radeon HD 7990

Intro

Compare all that to the Radeon HD 7990, which makes use of a 28 nm design. AMD has set the core frequency at 950 MHz. The GDDR5 RAM works at a speed of 1500 MHz on this particular model. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4350		22 Watts
Radeon HD 7990		375 Watts
	Difference: 353 Watts (1605%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 should be much faster than the Radeon HD 4350 overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 4350		8000 MB/sec
	Difference: 568000 (7100%)

Texel Rate

The Radeon HD 7990 will be much (about 5187%) more effective at anisotropic filtering than the Radeon HD 4350. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 4350		4600 Mtexels/sec
	Difference: 238600 (5187%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 7990 is the winner, by far. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 4350		2300 Mpixels/sec
	Difference: 58500 (2543%)

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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.