GeForce GT 240 GDDR5 1GB vs Radeon HD 4650 1GB

Intro

Compare those specs to the Radeon HD 4650 1GB, which has a core clock speed of 600 MHz and a GDDR3 memory speed of 700 MHz. It also uses a 128-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
GeForce GT 240 GDDR5 1GB		70 Watts
	Difference: 15 Watts (27%)

Memory Bandwidth

The GeForce GT 240 GDDR5 1GB should in theory perform much faster than the Radeon HD 4650 1GB overall. (explain)

GeForce GT 240 GDDR5 1GB		54400 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 32000 (143%)

Texel Rate

The Radeon HD 4650 1GB should be a bit (approximately 9%) faster with regards to texture filtering than the GeForce GT 240 GDDR5 1GB. (explain)

Radeon HD 4650 1GB		19200 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 1600 (9%)

Pixel Rate

The Radeon HD 4650 1GB will be a small bit (approximately 9%) more effective at AA than the GeForce GT 240 GDDR5 1GB, and should be able to handle higher resolutions better. (explain)

Radeon HD 4650 1GB		4800 Mpixels/sec
GeForce GT 240 GDDR5 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 (in units of megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number 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 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 can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.