GeForce GTX 750 Ti vs Radeon HD 4890 2GB

Intro

Compare those specifications to the Radeon HD 4890 2GB, which has GPU clock speed of 1000 MHz, and 2048 MB of GDDR5 memory running at 975 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 750 Ti		60 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 130 Watts (217%)

Memory Bandwidth

Theoretically, the Radeon HD 4890 2GB should perform quite a bit faster than the GeForce GTX 750 Ti overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce GTX 750 Ti		86400 MB/sec
	Difference: 38400 (44%)

Texel Rate

The GeForce GTX 750 Ti should be just a bit (about 2%) more effective at AF than the Radeon HD 4890 2GB. (explain)

GeForce GTX 750 Ti		40800 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 800 (2%)

Pixel Rate

The GeForce GTX 750 Ti should be a small bit (about 2%) faster with regards to full screen anti-aliasing than the Radeon HD 4890 2GB, and also capable of handling higher resolutions more effectively. (explain)

GeForce GTX 750 Ti		16320 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 320 (2%)

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 maximum amount of data (measured in megabytes per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the 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 amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.