Geforce GTX 670 vs Radeon HD 4830 512MB

Intro

Compare all of that to the Radeon HD 4830 512MB, which comes with a clock speed of 575 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, 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 670		170 Watts
	Difference: 75 Watts (79%)

Memory Bandwidth

The Geforce GTX 670 should theoretically be quite a bit faster than the Radeon HD 4830 512MB in general. (explain)

Geforce GTX 670		192000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 134400 (233%)

Texel Rate

The Geforce GTX 670 will be much (approximately 457%) more effective at anisotropic filtering than the Radeon HD 4830 512MB. (explain)

Geforce GTX 670		102480 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 84080 (457%)

Pixel Rate

The Geforce GTX 670 will be a lot (approximately 218%) more effective at full screen anti-aliasing than the Radeon HD 4830 512MB, and able to handle higher screen resolutions without losing too much performance. (explain)

Geforce GTX 670		29280 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 20080 (218%)

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: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its 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 speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.