Hey Bhagtru,
The Titan is a big card :)
the Power supply in the 810-170st is 600W uATX power supply - I noticed it isn't listed on the web site. I'll see if I can get them to add that spec to the sales site, it is listed on the support site here:
it is important especailly when upgrading the PC.
The biggest card we offer in there is the NVidia 770 here a link to the base specs
http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-770/specifications
scroll to the bottom of the specs page and look for wattage required for the card. For this one it is 230W, and the 600W power supply we have in the unit will drive it just fine.
Thermal and Power Specs:
230 WGraphics Card Power (W)
600 WMinimum Recommended System Power (W)
One 8-pin and one 6-pinSupplementary Power Connectors
then you can go to the Titan link:
guess what... just about the same specs - it should work just fine, with 20W more it would still be able to handle it with 600W power supply.
Thermal and Power Specs:
95 CMaximum GPU Tempurature (in C)
250 WGraphics Card Power (W)
600 WMinimum System Power Requirement (W)
One 8-pin and one 6-pinSupplementary Power Connectors
Good luck and game on!
bill