My Gainward GTX titan black shuts down my computer when I try to play demanding games, i have tried two graphic cards, GTX 460 and GTX titan, and the problem doesn't seem to appear on those. i have a hp z800 workstation motherboard and a hp 1000 watt PSU
can you give us more specs about your PSU? maybe a link to a page about it?
Its the 1100 watt version, i think
(http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/psi/setupInstallDisplay?javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken&javax.portlet.prp_efb5c0793523e51970c8fa22b053ce01=wsrp-navigationalState%3DdocId%253Demr_na-c01720139-2%257CdocLocale%253Den_US&javax.portlet.tpst=efb5c0793523e51970c8fa22b053ce01&sp4ts.oid=3718645&ac.admitted=1406162978867.876444892.199480143)