GeForce GT 320 vs Radeon HD 4850 512MB

Intro

Compare all of that to the Radeon HD 4850 512MB, which uses a 55 nm design. AMD has set the core speed at 625 MHz. The GDDR3 RAM works at a speed of 993 MHz on this specific card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
Radeon HD 4850 512MB		110 Watts
	Difference: 67 Watts (156%)

Memory Bandwidth

In theory, the Radeon HD 4850 512MB is 151% faster than the GeForce GT 320 overall, due to its higher data rate. (explain)

Radeon HD 4850 512MB		63552 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 38272 (151%)

Texel Rate

The Radeon HD 4850 512MB should be quite a bit (more or less 93%) more effective at texture filtering than the GeForce GT 320. (explain)

Radeon HD 4850 512MB		25000 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 12040 (93%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4850 512MB is a better choice, by far. (explain)

Radeon HD 4850 512MB		10000 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 5680 (131%)

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 information (measured in megabytes per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 in one second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at handling 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 graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.