GeForce GTX 960 vs Radeon HD 4830 1GB

Intro

Compare that to the Radeon HD 4830 1GB, which comes with a GPU core clock speed of 575 MHz, and 1024 MB of GDDR4 memory set to run at 900 MHz through a 256-bit bus. It also features 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB		95 Watts
GeForce GTX 960		120 Watts
	Difference: 25 Watts (26%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 960 is 94% faster than the Radeon HD 4830 1GB overall, due to its greater data rate. (explain)

GeForce GTX 960		112000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 54400 (94%)

Texel Rate

The GeForce GTX 960 is a lot (approximately 292%) more effective at AF than the Radeon HD 4830 1GB. (explain)

GeForce GTX 960		72128 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 53728 (292%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 960 is superior to the Radeon HD 4830 1GB, by far. (explain)

GeForce GTX 960		36064 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 26864 (292%)

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 transferred across the external memory interface within a second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 can be applied per second. This is calculated by multiplying the total number of 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in one 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 clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.