GeForce GTX 660 Ti vs Radeon HD 4850 2GB

Intro

Compare those specs to the Radeon HD 4850 2GB, which features core speeds of 625 MHz on the GPU, and 993 MHz on the 2048 MB of GDDR4 memory. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 2GB		110 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 40 Watts (36%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 Ti should be quite a bit faster than the Radeon HD 4850 2GB overall. (explain)

GeForce GTX 660 Ti		144000 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 80448 (127%)

Texel Rate

The GeForce GTX 660 Ti should be a lot (approximately 310%) faster with regards to texture filtering than the Radeon HD 4850 2GB. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
Radeon HD 4850 2GB		25000 Mtexels/sec
	Difference: 77480 (310%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 660 Ti is superior to the Radeon HD 4850 2GB, and very much so. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
Radeon HD 4850 2GB		10000 Mpixels/sec
	Difference: 11960 (120%)

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 largest amount of information (counted in megabytes per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to 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 bandwidth is, the lower the potential to get to the maximum fill rate.