GeForce GTX 650 Ti vs Radeon HD 4870 512MB

Intro

Compare that to the Radeon HD 4870 512MB, which features a GPU core clock speed of 750 MHz, and 512 MB of GDDR5 memory running at 900 MHz through a 256-bit bus. It also 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		110 Watts
Radeon HD 4870 512MB		150 Watts
	Difference: 40 Watts (36%)

Memory Bandwidth

Theoretically, the Radeon HD 4870 512MB should be a lot faster than the GeForce GTX 650 Ti overall. (explain)

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

Texel Rate

The GeForce GTX 650 Ti is much (approximately 98%) better at texture filtering than the Radeon HD 4870 512MB. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 650 Ti is superior to the Radeon HD 4870 512MB, by far. (explain)

GeForce GTX 650 Ti		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 (counted in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 are applied in one second. This is worked out by multiplying the total number of texture units of the card 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of 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.