GeForce GTX 650 Ti 2GB vs Radeon HD 4770

Intro

Compare that to the Radeon HD 4770, which features GPU clock speed of 750 MHz, and 512 MB of GDDR5 memory set to run at 800 MHz through a 128-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce GTX 650 Ti 2GB		110 Watts
	Difference: 30 Watts (38%)

Memory Bandwidth

The GeForce GTX 650 Ti 2GB should theoretically perform much faster than the Radeon HD 4770 overall. (explain)

GeForce GTX 650 Ti 2GB		86400 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 35200 (69%)

Texel Rate

The GeForce GTX 650 Ti 2GB will be much (approximately 147%) faster with regards to texture filtering than the Radeon HD 4770. (explain)

GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 35392 (147%)

Pixel Rate

The GeForce GTX 650 Ti 2GB should be much (approximately 24%) better at AA than the Radeon HD 4770, and should be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 2848 (24%)

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 max amount of information (counted in megabytes per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 amount of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the 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 graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.