Geforce GTX 670 vs Radeon HD 4830 512MB

Intro

Compare those specifications to the Radeon HD 4830 512MB, which uses a 55 nm design. AMD has clocked the core speed at 575 MHz. The GDDR3 memory is set to run at a frequency of 900 MHz on this particular model. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

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

In theory, the Geforce GTX 670 is 233% quicker than the Radeon HD 4830 512MB in general, because of its greater data rate. (explain)

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

Texel Rate

The Geforce GTX 670 is a lot (about 457%) faster with regards to texture 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 should be much (approximately 218%) more effective at full screen anti-aliasing than the Radeon HD 4830 512MB, and capable of handling higher resolutions while still performing well. (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 maximum amount of data (in units of MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 number of texture map elements (texels) that are applied per second. This number is worked out 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many 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.