GeForce GTX 650 Ti 2GB vs Radeon HD 4870 512MB

Intro

Compare that to the Radeon HD 4870 512MB, which has a GPU core clock speed of 750 MHz, and 512 MB of GDDR5 RAM set to run at 900 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 650 Ti 2GB		110 Watts
Radeon HD 4870 512MB		150 Watts
	Difference: 40 Watts (36%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 512MB should be quite a bit faster than the GeForce GTX 650 Ti 2GB in general. (explain)

Radeon HD 4870 512MB		115200 MB/sec
GeForce GTX 650 Ti 2GB		86400 MB/sec
	Difference: 28800 (33%)

Texel Rate

The GeForce GTX 650 Ti 2GB will be quite a bit (approximately 98%) better at texture filtering than the Radeon HD 4870 512MB. (explain)

GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
Radeon HD 4870 512MB		30000 Mtexels/sec
	Difference: 29392 (98%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 650 Ti 2GB is superior to the Radeon HD 4870 512MB, by far. (explain)

GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
Radeon HD 4870 512MB		12000 Mpixels/sec
	Difference: 2848 (24%)

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

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.