GeForce GT 240 GDDR5 vs Radeon HD 4770

Intro

Compare those specs to the Radeon HD 4770, which features a clock speed of 750 MHz and a GDDR5 memory speed of 800 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 640(128x5) SPUs, 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 4770		80 Watts
	Difference: 10 Watts (14%)

Memory Bandwidth

The GeForce GT 240 GDDR5 should theoretically be just a bit faster than the Radeon HD 4770 in general. (explain)

GeForce GT 240 GDDR5		54400 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 3200 (6%)

Texel Rate

The Radeon HD 4770 will be quite a bit (about 36%) faster with regards to texture filtering than the GeForce GT 240 GDDR5. (explain)

Radeon HD 4770		24000 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 6400 (36%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4770 is the winner, and very much so. (explain)

Radeon HD 4770		12000 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 7600 (173%)

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 data (measured in megabytes per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, it 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 anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the graphics 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 that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. 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 potential to reach the maximum fill rate.