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

Intro

Compare those specifications to the Radeon HD 4870 2GB, which makes use of a 55 nm design. AMD has set the core speed at 750 MHz. The GDDR5 RAM is set to run at a frequency of 900 MHz on this specific card. It features 800(160x5) SPUs along with 40 Texture Address Units 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 2GB		150 Watts
	Difference: 40 Watts (36%)

Memory Bandwidth

In theory, the Radeon HD 4870 2GB will be 33% faster than the GeForce GTX 650 Ti 2GB overall, due to its greater data rate. (explain)

Radeon HD 4870 2GB		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 (about 98%) better at anisotropic filtering than the Radeon HD 4870 2GB. (explain)

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

Pixel Rate

The GeForce GTX 650 Ti 2GB will be quite a bit (approximately 24%) better at FSAA than the Radeon HD 4870 2GB, and should be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
Radeon HD 4870 2GB		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 data (measured in megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, it 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 amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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