GeForce GTX 285 2GB vs Geforce GTX 770

Intro

Compare all of that to the Geforce GTX 770, which comes with core speeds of 1046 MHz on the GPU, and 1753 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 285 2GB		204 Watts
Geforce GTX 770		230 Watts
	Difference: 26 Watts (13%)

Memory Bandwidth

Performance-wise, the Geforce GTX 770 should in theory be much superior to the GeForce GTX 285 2GB overall. (explain)

Geforce GTX 770		224384 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 65408 (41%)

Texel Rate

The Geforce GTX 770 will be quite a bit (approximately 158%) better at texture filtering than the GeForce GTX 285 2GB. (explain)

Geforce GTX 770		133888 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 82048 (158%)

Pixel Rate

The Geforce GTX 770 will be quite a bit (more or less 61%) more effective at full screen anti-aliasing than the GeForce GTX 285 2GB, and should be able to handle higher resolutions better. (explain)

Geforce GTX 770		33472 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 12736 (61%)

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 MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once 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 texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. 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 is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.