GeForce GT 240 GDDR5 vs Radeon HD 4770

Intro

Compare those specifications to the Radeon HD 4770, which uses a 40 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 memory runs at a speed of 800 MHz on this particular card. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

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

As far as performance goes, the GeForce GT 240 GDDR5 should in theory be a small bit superior to 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 is quite a bit (more or less 36%) better at AF 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 using high levels of AA is important to you, then the Radeon HD 4770 is a better choice, by far. (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 (in units of megabytes per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses 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, HDR 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 amount of texture units by the core 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one 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 - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.