Geforce GTX 770 vs Radeon HD 3850 X2

Intro

Compare those specifications to the Radeon HD 3850 X2, which comes with GPU core speed of 668 MHz, and 512 MB of GDDR3 memory running at 828 MHz through a 256-bit bus. It also is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Geforce GTX 770 is 112% faster than the Radeon HD 3850 X2 overall, because of its higher data rate. (explain)

Geforce GTX 770		224384 MB/sec
Radeon HD 3850 X2		105984 MB/sec
	Difference: 118400 (112%)

Texel Rate

The Geforce GTX 770 should be a lot (about 526%) better at anisotropic filtering than the Radeon HD 3850 X2. (explain)

Geforce GTX 770		133888 Mtexels/sec
Radeon HD 3850 X2		21376 Mtexels/sec
	Difference: 112512 (526%)

Pixel Rate

The Geforce GTX 770 should be quite a bit (more or less 57%) more effective at FSAA than the Radeon HD 3850 X2, and should be capable of handling higher resolutions while still performing well. (explain)

Geforce GTX 770		33472 Mpixels/sec
Radeon HD 3850 X2		21376 Mpixels/sec
	Difference: 12096 (57%)

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 (in units of megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the graphics 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 most pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.