GeForce GT 240 GDDR5 vs Radeon HD 6770

Intro

Compare those specs to the Radeon HD 6770, which features GPU clock speed of 900 MHz, and 512 MB of GDDR5 memory set to run at 1050 MHz through a 128-bit bus. It also features 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5		70 Watts
Radeon HD 6770		108 Watts
	Difference: 38 Watts (54%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 should be a lot faster than the GeForce GT 240 GDDR5 overall. (explain)

Radeon HD 6770		67200 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 12800 (24%)

Texel Rate

The Radeon HD 6770 will be much (approximately 105%) more effective at AF than the GeForce GT 240 GDDR5. (explain)

Radeon HD 6770		36000 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 18400 (105%)

Pixel Rate

The Radeon HD 6770 will be a lot (more or less 227%) more effective at FSAA than the GeForce GT 240 GDDR5, and also should be able to handle higher resolutions more effectively. (explain)

Radeon HD 6770		14400 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 10000 (227%)

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 largest amount of data (measured in MB per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the 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 texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.