For any of you looking to revive your 435 try Win8 and a ASUS GeForce GTX 650 1GB DDR5 PCI-E Video Card. You can even keep your 360w power supply as this card outperforms the OEM Radoen HD 4850 and sips about 40w less power.
Win 8 set me back $15, and the GeForce can be had for about $125. For the first time i can run those Dell Video testing routines without stuttering. I haven’t bothered to overclock it yet but it comes with software that will easily change voltages, clocks etc.