GeForce GTX 650 Ti 2GB vs Radeon HD 4870 1GB

Intro

Compare those specifications to the Radeon HD 4870 1GB, which features a clock frequency of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also features a 256-bit bus, and uses a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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 1GB		150 Watts
	Difference: 40 Watts (36%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4870 1GB should theoretically be quite a bit superior to the GeForce GTX 650 Ti 2GB overall. (explain)

Radeon HD 4870 1GB		115200 MB/sec
GeForce GTX 650 Ti 2GB		86400 MB/sec
	Difference: 28800 (33%)

Texel Rate

The GeForce GTX 650 Ti 2GB should be quite a bit (approximately 98%) better at texture filtering than the Radeon HD 4870 1GB. (explain)

GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
Radeon HD 4870 1GB		30000 Mtexels/sec
	Difference: 29392 (98%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 650 Ti 2GB is a better choice, by a large margin. (explain)

GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
Radeon HD 4870 1GB		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 max amount of information (measured in MB per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.