GeForce GT 240 GDDR5 vs Radeon HD 4830 1GB

Intro

Compare those specs to the Radeon HD 4830 1GB, which has core clock speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 RAM. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5		70 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 25 Watts (36%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4830 1GB should theoretically be just a bit better than the GeForce GT 240 GDDR5 overall. (explain)

Radeon HD 4830 1GB		57600 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 3200 (6%)

Texel Rate

The Radeon HD 4830 1GB will be a little bit (more or less 5%) more effective at texture filtering than the GeForce GT 240 GDDR5. (explain)

Radeon HD 4830 1GB		18400 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 800 (5%)

Pixel Rate

The Radeon HD 4830 1GB should be much (approximately 109%) more effective at anti-aliasing than the GeForce GT 240 GDDR5, and also will be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 4830 1GB		9200 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 4800 (109%)

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 maximum amount of data (in units of megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. If it uses 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 AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number 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 also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.