Geforce GTX 690 vs Radeon HD 4830 512MB

Intro

Compare that to the Radeon HD 4830 512MB, which makes use of a 55 nm design. AMD has clocked the core speed at 575 MHz. The GDDR3 memory runs at a speed of 900 MHz on this particular model. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
Geforce GTX 690		300 Watts
	Difference: 205 Watts (216%)

Memory Bandwidth

In theory, the Geforce GTX 690 should be quite a bit faster than the Radeon HD 4830 512MB in general. (explain)

Geforce GTX 690		384512 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 326912 (568%)

Texel Rate

The Geforce GTX 690 will be quite a bit (approximately 1173%) faster with regards to anisotropic filtering than the Radeon HD 4830 512MB. (explain)

Geforce GTX 690		234240 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 215840 (1173%)

Pixel Rate

If running with high levels of AA is important to you, then the Geforce GTX 690 is the winner, by far. (explain)

Geforce GTX 690		58560 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 49360 (537%)

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 (measured in megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, 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 amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the card will be at handling 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 that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.