GeForce GTX 750 Ti vs Radeon HD 4890 1GB

Intro

Compare that to the Radeon HD 4890 1GB, which makes use of a 55 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory is set to run at a speed of 975 MHz on this particular card. It features 800(160x5) SPUs along with 40 Texture Address Units 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 1GB		190 Watts
	Difference: 130 Watts (217%)

Memory Bandwidth

The Radeon HD 4890 1GB, in theory, should be a lot faster than the GeForce GTX 750 Ti overall. (explain)

Radeon HD 4890 1GB		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 1GB. (explain)

GeForce GTX 750 Ti		40800 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 800 (2%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 750 Ti is a better choice, but only just. (explain)

GeForce GTX 750 Ti		16320 Mpixels/sec
Radeon HD 4890 1GB		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 MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 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 clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.