, 3GB is a huge amount for today's games and will be fine for tomorrow's too during the useful lifespan of a GTX 780... you have a handful of titles even available today that require special circumstances and super-high resolutions + mods to exceed that or generally even come close, and that's just going by allocation which is more than real usage, not actual requirements (which Afterburner cannot tell you, nor actual usage). The whole "I NEED 6GB" thing is way overblown by people who simply aren't informed.
Found a Russian site with a product listing and 0.00 price (unavailable, obviously), one interesting tidbit...
Video Card ASUS GTX780 3GB 384bit G5
Price with VAT: 0.00 lv.
The product is not available.
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Description: Video Card ASUS GTX780 3GB 384bit G5
Video Card manufacturer ASUS GTX780 model-3GD5. 3 GB of GDDR5 6008MHz, 384 bit, HDMI, 2 x DVI.
Characteristics: Video Card ASUS GTX780 3GB 384bit G5
Slot PCI-Express 3.0 x 16
Manufacturer of the Nvidia chipsets
Chipset NVIDIA GeForce GTX 780
Name kernel GK110
Number of GPUs 1
Speed of 863 MHz kernel
Stream Processors 2304
Maximum resolution 2560x1600
The amount of video memory 3 GB
Memory Type GDDR5
Speed video memory (effective) 6008 MHz
Memory Bus Bandwidth (bit) 384 bit
Width of the channel memory 288 GB / sec
2 x DVI
Cooling System - Type 1 fan 2 slots
Warranty 24 months
The included covers
One of Video Card in envelope
It says DX11.1.