`?

Yes, but it's better with "ti". You can see here minimum and best performance PMDG recomandations: http://www.precisionmanuals.com/pages/product/ngx.html .

And you can follow this software and hardware quide, it's realy good, especially about system: http://forum.avsim.net/topic/370594-read-before-posting-software-hardware-guide-for-fsx/