GeForce GTX 660 Ti vs Radeon HD 4850 2GB

Intro

Compare those specs to the Radeon HD 4850 2GB, which makes use of a 55 nm design. AMD has set the core frequency at 625 MHz. The GDDR4 RAM works at a frequency of 993 MHz on this card. 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 2GB		110 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 40 Watts (36%)

Memory Bandwidth

The GeForce GTX 660 Ti should in theory be a lot faster than the Radeon HD 4850 2GB in general. (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 is much (about 310%) better at 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 using lots of anti-aliasing is important to you, then the GeForce GTX 660 Ti is a better choice, by a large margin. (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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is worked out by multiplying the total amount 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 amount of 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 colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.