GeForce 8400 GS 512MB vs Radeon HD 4850 512MB

Intro

Compare that to the Radeon HD 4850 512MB, which features GPU core speed of 625 MHz, and 512 MB of GDDR3 memory set to run at 993 MHz through a 256-bit bus. It also features 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Radeon HD 4850 512MB		110 Watts
	Difference: 70 Watts (175%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4850 512MB should theoretically be a lot superior to the GeForce 8400 GS 512MB in general. (explain)

Radeon HD 4850 512MB		63552 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 57152 (893%)

Texel Rate

The Radeon HD 4850 512MB will be quite a bit (approximately 381%) faster with regards to anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

Radeon HD 4850 512MB		25000 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 19800 (381%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4850 512MB is superior to the GeForce 8400 GS 512MB, by a large margin. (explain)

Radeon HD 4850 512MB		10000 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 7400 (285%)

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 information (measured in megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 texture map elements (texels) that can be applied per second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.