GeForce GTX 950 vs Radeon HD 4830 512MB

Intro

Compare those specifications to the Radeon HD 4830 512MB, which comes with GPU clock speed of 575 MHz, and 512 MB of GDDR3 memory set to run at 900 MHz through a 256-bit bus. It also features 640(128x5) Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 950		90 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 5 Watts (6%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 950 should perform quite a bit faster than the Radeon HD 4830 512MB overall. (explain)

GeForce GTX 950		105728 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 48128 (84%)

Texel Rate

The GeForce GTX 950 should be quite a bit (approximately 167%) better at anisotropic filtering than the Radeon HD 4830 512MB. (explain)

GeForce GTX 950		49152 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 30752 (167%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 950 is superior to the Radeon HD 4830 512MB, and very much so. (explain)

GeForce GTX 950		32768 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 23568 (256%)

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: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 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 AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.