GeForce GTX 650 Ti vs Radeon HD 4890 2GB

Intro

Compare all of that to the Radeon HD 4890 2GB, which comes with a core clock speed of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also features a 256-bit bus, and uses a 55 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti		110 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 80 Watts (73%)

Memory Bandwidth

The Radeon HD 4890 2GB should in theory be much faster than the GeForce GTX 650 Ti overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce GTX 650 Ti		86400 MB/sec
	Difference: 38400 (44%)

Texel Rate

The GeForce GTX 650 Ti will be quite a bit (approximately 48%) more effective at anisotropic filtering than the Radeon HD 4890 2GB. (explain)

GeForce GTX 650 Ti		59392 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 19392 (48%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4890 2GB is the winner, though only just barely. (explain)

Radeon HD 4890 2GB		16000 Mpixels/sec
GeForce GTX 650 Ti		14848 Mpixels/sec
	Difference: 1152 (8%)

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 largest amount of information (counted in MB per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.