GeForce GTX 650 Ti vs Radeon HD 4770

Intro

Compare those specs to the Radeon HD 4770, which features a core clock speed of 750 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

As far as performance goes, the GeForce GTX 650 Ti should in theory be much superior to the Radeon HD 4770 in general. (explain)

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

Texel Rate

The GeForce GTX 650 Ti should be quite a bit (more or less 147%) better at anisotropic filtering than the Radeon HD 4770. (explain)

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

Pixel Rate

The GeForce GTX 650 Ti is quite a bit (approximately 24%) better at FSAA than the Radeon HD 4770, and also able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 650 Ti		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: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units of the card by the core clock 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 most pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.