GeForce GT 340 1GB vs Radeon HD 4650 512MB

Intro

Compare all that to the Radeon HD 4650 512MB, which comes with core clock speeds of 600 MHz on the GPU, and 500 MHz on the 512 MB of DDR2 memory. It features 320(64x5) SPUs along with 32 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GT 340 1GB		69 Watts
	Difference: 14 Watts (25%)

Memory Bandwidth

As far as performance goes, the GeForce GT 340 1GB should theoretically be a lot better than the Radeon HD 4650 512MB in general. (explain)

GeForce GT 340 1GB		54400 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 38400 (240%)

Texel Rate

The Radeon HD 4650 512MB is a small bit (more or less 9%) faster with regards to texture filtering than the GeForce GT 340 1GB. (explain)

Radeon HD 4650 512MB		19200 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 1600 (9%)

Pixel Rate

The Radeon HD 4650 512MB should be just a bit (about 9%) faster with regards to full screen anti-aliasing than the GeForce GT 340 1GB, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4650 512MB		4800 Mpixels/sec
GeForce GT 340 1GB		4400 Mpixels/sec
	Difference: 400 (9%)

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 max amount of data (counted in megabytes per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. 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 texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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 memory bandwidth is, the lower the potential to get to the maximum fill rate.