GeForce GT 240 GDDR5 vs Radeon HD 6770 1GB

Intro

Compare that to the Radeon HD 6770 1GB, which makes use of a 40 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 RAM is set to run at a frequency of 1050 MHz on this particular card. It features 800 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5		70 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 38 Watts (54%)

Memory Bandwidth

Performance-wise, the Radeon HD 6770 1GB should theoretically be quite a bit superior to the GeForce GT 240 GDDR5 in general. (explain)

Radeon HD 6770 1GB		67200 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 12800 (24%)

Texel Rate

The Radeon HD 6770 1GB should be a lot (approximately 105%) more effective at AF than the GeForce GT 240 GDDR5. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 18400 (105%)

Pixel Rate

The Radeon HD 6770 1GB is a lot (about 227%) faster with regards to full screen anti-aliasing than the GeForce GT 240 GDDR5, and also should be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 6770 1GB		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 maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.