GeForce GTX 650 Ti vs Radeon HD 3870 X2 1GB

Intro

Compare that to the Radeon HD 3870 X2 1GB, which makes use of a 55 nm design. AMD has set the core frequency at 825 MHz. The GDDR4 RAM is set to run at a speed of 1126 MHz on this particular card. It features 320(64x5) SPUs along with 16 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3870 X2 1GB should in theory be quite a bit faster than the GeForce GTX 650 Ti overall. (explain)

Radeon HD 3870 X2 1GB		144128 MB/sec
GeForce GTX 650 Ti		86400 MB/sec
	Difference: 57728 (67%)

Texel Rate

The GeForce GTX 650 Ti will be a lot (about 125%) better at AF than the Radeon HD 3870 X2 1GB. (explain)

GeForce GTX 650 Ti		59392 Mtexels/sec
Radeon HD 3870 X2 1GB		26400 Mtexels/sec
	Difference: 32992 (125%)

Pixel Rate

The Radeon HD 3870 X2 1GB should be quite a bit (about 78%) better at AA than the GeForce GTX 650 Ti, and capable of handling higher resolutions while still performing well. (explain)

Radeon HD 3870 X2 1GB		26400 Mpixels/sec
GeForce GTX 650 Ti		14848 Mpixels/sec
	Difference: 11552 (78%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core 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 rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.