yes, that mobo has a PCI-E 2.0 slot. realize a few things on all those cards.
you will need two empty slots to install them and a PSU upgrade to run them. also if you have the Athlon II X2 245 CPU, you will not notice any difference between the 6850 or 6870. In fact an ATI 5770 would be more then enough for that CPU. If you have the Sempron 140, then the CPU is too weak for modern PC games.
if you stick a paper clip in its 24pin connector, it will make a fine paper weight with a cool blue LED. get the xigmatek, its bronze efficient, more power on its 12v rail, and it can deliver 500w with no issue all for the same price. i doubt that raid max can deliver 400w.
ive owned asus cards and never had an issue but sapphire and HIS are fine. Sapphire I believe makes/sells more AMD cards then anyone else. HIS has good cards but their customer service has been known to be bad. frankly, get the cheapest one.