GeForce GTX 660 Ti vs Radeon HD 4850 512MB

Intro

Compare those specifications to the Radeon HD 4850 512MB, which uses a 55 nm design. AMD has set the core frequency at 625 MHz. The GDDR3 RAM runs at a frequency of 993 MHz on this particular model. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 512MB		110 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 40 Watts (36%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 Ti should in theory be much better than the Radeon HD 4850 512MB in general. (explain)

GeForce GTX 660 Ti		144000 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 80448 (127%)

Texel Rate

The GeForce GTX 660 Ti should be much (more or less 310%) more effective at anisotropic filtering than the Radeon HD 4850 512MB. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
Radeon HD 4850 512MB		25000 Mtexels/sec
	Difference: 77480 (310%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 660 Ti is superior to the Radeon HD 4850 512MB, by a large margin. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
Radeon HD 4850 512MB		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 maximum amount of data (measured in megabytes per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units by the core clock 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.