GeForce GT 340 1GB vs Radeon HD 4650 512MB

Intro

Compare all of that to the Radeon HD 4650 512MB, which makes use of a 55 nm design. AMD has set the core speed at 600 MHz. The DDR2 memory works at a speed of 500 MHz on this particular card. It features 320(64x5) SPUs as well as 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 in theory be much 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 little bit (more or less 9%) better at anisotropic 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 a bit (about 9%) faster with regards to AA than the GeForce GT 340 1GB, and capable of handling higher screen resolutions while still performing well. (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 largest amount of data (measured in megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.