Radeon HD 4350 vs Radeon HD 7990

Intro

Compare those specifications to the Radeon HD 7990, which has a core clock frequency of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 384-bit bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

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

Performance-wise, the Radeon HD 7990 should in theory be a lot superior to 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 should be a lot (approximately 5187%) better 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

The Radeon HD 7990 should be a lot (about 2543%) better at AA than the Radeon HD 4350, and will be capable of handling higher screen resolutions without slowing down too much. (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: Bandwidth is the largest amount of data (measured in MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, 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 worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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