GeForce GTX 660 vs Radeon HD 5770

Intro

Compare all of that to the Radeon HD 5770, which has GPU clock speed of 850 MHz, and 1024 MB of GDDR5 memory running at 1200 MHz through a 128-bit bus. It also is made up of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
GeForce GTX 660		140 Watts
	Difference: 32 Watts (30%)

Memory Bandwidth

The GeForce GTX 660, in theory, should perform much faster than the Radeon HD 5770 in general. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 67392 (88%)

Texel Rate

The GeForce GTX 660 will be quite a bit (about 131%) faster with regards to texture filtering than the Radeon HD 5770. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 44400 (131%)

Pixel Rate

The GeForce GTX 660 should be quite a bit (about 73%) faster with regards to FSAA than the Radeon HD 5770, and also will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 9920 (73%)

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 max amount of information (measured in megabytes per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends 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 max fill rate.