GeForce GTX 660 vs Radeon HD 4770

Intro

Compare those specs to the Radeon HD 4770, which uses a 40 nm design. AMD has set the core speed at 750 MHz. The GDDR5 memory works at a frequency of 800 MHz on this model. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce GTX 660		140 Watts
	Difference: 60 Watts (75%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 should perform much faster than the Radeon HD 4770 in general. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 92992 (182%)

Texel Rate

The GeForce GTX 660 will be a lot (approximately 227%) more effective at texture filtering than the Radeon HD 4770. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 54400 (227%)

Pixel Rate

The GeForce GTX 660 should be a lot (more or less 96%) faster with regards to AA than the Radeon HD 4770, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 11520 (96%)

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 information (counted in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.