GeForce GTX 650 Ti 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 runs 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

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti		110 Watts
Radeon HD 4870 2GB		150 Watts
	Difference: 40 Watts (36%)

Memory Bandwidth

Theoretically, the Radeon HD 4870 2GB should be a lot faster than the GeForce GTX 650 Ti in general. (explain)

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

Texel Rate

The GeForce GTX 650 Ti will be much (approximately 98%) more effective at AF than the Radeon HD 4870 2GB. (explain)

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

Pixel Rate

The GeForce GTX 650 Ti will be much (about 24%) more effective at AA than the Radeon HD 4870 2GB, and also will be capable of handling higher screen resolutions better. (explain)

GeForce GTX 650 Ti		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: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 max fill rate.