[LinuxBIOS] using Graphics card ram as actual ram?

[RusH]

Recently I saw a tour around Wilk Elektronik fab (Polish company,
they own GoodRAM brand).
http://www.egielda.com.pl/?str=art&id=2902&action=all (its in Polish,
sadly no interesting pictures )

There was one interesting thing - their testing lab. Currently they
are using modded PC motherboards (Variable Voltage Regulator) to test
modules (bad chip detection, performance).  At the end of the tour Lab
monkey showed of his latest monster, test setup for hot swap module
testing, the key point and main feature of this beast was using PCIE
Video card memory for the main program memory.

Currently LinuxBios is using CAR for ram. What about using Video card
memory? is that feasible? Can you setup Video memory as stack?