GeForce GTX 660 Ti vs Radeon HD 4750

Intro

Compare that to the Radeon HD 4750, which comes with core clock speeds of 730 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 75 Watts (100%)

Memory Bandwidth

Performance-wise, the GeForce GTX 660 Ti should in theory be quite a bit better than the Radeon HD 4750 overall. (explain)

GeForce GTX 660 Ti		144000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 92800 (181%)

Texel Rate

The GeForce GTX 660 Ti should be much (about 339%) better at anisotropic filtering than the Radeon HD 4750. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 79120 (339%)

Pixel Rate

The GeForce GTX 660 Ti will be quite a bit (approximately 88%) better at AA than the Radeon HD 4750, and will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 10280 (88%)

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 (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 can be processed in one second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the 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 amount of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.