GeForce GTX 980 vs Radeon HD 4830 512MB

Intro

Compare all that to the Radeon HD 4830 512MB, which makes use of a 55 nm design. AMD has set the core frequency at 575 MHz. The GDDR3 RAM runs at a speed of 900 MHz on this specific model. It features 640(128x5) SPUs as well as 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 980		165 Watts
	Difference: 70 Watts (74%)

Memory Bandwidth

In theory, the GeForce GTX 980 should be 289% faster than the Radeon HD 4830 512MB overall, because of its higher data rate. (explain)

GeForce GTX 980		224000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 166400 (289%)

Texel Rate

The GeForce GTX 980 should be a lot (about 683%) more effective at anisotropic filtering than the Radeon HD 4830 512MB. (explain)

GeForce GTX 980		144128 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 125728 (683%)

Pixel Rate

The GeForce GTX 980 should be much (about 683%) better at AA than the Radeon HD 4830 512MB, and able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 980		72064 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 62864 (683%)

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 (measured in megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 most pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel 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 max fill rate.