GeForce GTX 750 Ti vs Radeon HD 4890 2GB

Intro

Compare those specifications to the Radeon HD 4890 2GB, which makes use of a 55 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM runs at a speed of 975 MHz on this specific model. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

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 speaking, the Radeon HD 4890 2GB will be 44% faster than the GeForce GTX 750 Ti overall, due to its greater bandwidth. (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 a little bit (more or less 2%) better at texture filtering 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

If using lots of anti-aliasing is important to you, then the GeForce GTX 750 Ti is a better choice, though not by far. (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 max amount of data (counted in megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total texture units of the card by the core 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 applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.