GeForce GTX 285 1GB vs Geforce GTX 770

Intro

Compare those specifications to the Geforce GTX 770, which has GPU clock speed of 1046 MHz, and 2048 MB of GDDR5 memory running at 1753 MHz through a 256-bit bus. It also is comprised of 1536 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 285 1GB		204 Watts
Geforce GTX 770		230 Watts
	Difference: 26 Watts (13%)

Memory Bandwidth

Performance-wise, the Geforce GTX 770 should theoretically be quite a bit better than the GeForce GTX 285 1GB in general. (explain)

Geforce GTX 770		224384 MB/sec
GeForce GTX 285 1GB		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 1GB. (explain)

Geforce GTX 770		133888 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 82048 (158%)

Pixel Rate

The Geforce GTX 770 will be much (more or less 61%) better at full screen anti-aliasing than the GeForce GTX 285 1GB, and should be able to handle higher resolutions without slowing down too much. (explain)

Geforce GTX 770		33472 Mpixels/sec
GeForce GTX 285 1GB		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 max amount of data (in units of megabytes per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range 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 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel 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 maximum fill rate.