GeForce GT 340 vs Radeon HD 4650 512MB

Intro

Compare those specifications to the Radeon HD 4650 512MB, which uses a 55 nm design. AMD has clocked the core frequency at 600 MHz. The DDR2 memory works at a frequency of 500 MHz on this specific card. It features 320(64x5) SPUs as well as 32 TAUs and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

In theory, the GeForce GT 340 should perform much faster than the Radeon HD 4650 512MB in general. (explain)

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

Texel Rate

The Radeon HD 4650 512MB will be just a bit (more or less 9%) better at AF than the GeForce GT 340. (explain)

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

Pixel Rate

The Radeon HD 4650 512MB should be a bit (approximately 9%) faster with regards to anti-aliasing than the GeForce GT 340, and also will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 4650 512MB		4800 Mpixels/sec
GeForce GT 340		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 maximum amount of data (counted in megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the video 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 amount of pixels the graphics card could possibly write to the local memory in a 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 outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.