GeForce GT 240 GDDR5 vs Radeon HD 4830 1GB

Intro

Compare those specs to the Radeon HD 4830 1GB, which makes use of a 55 nm design. AMD has clocked the core speed at 575 MHz. The GDDR4 memory works at a speed of 900 MHz on this model. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

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

Theoretically, the Radeon HD 4830 1GB should perform a little bit faster than the GeForce GT 240 GDDR5 in general. (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 (about 5%) more effective at AF 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

If running with a high resolution is important to you, then the Radeon HD 4830 1GB is superior to the GeForce GT 240 GDDR5, and very much so. (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: Bandwidth is the maximum amount of information (in units of MB per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output 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 ability to get to the maximum fill rate.