PCIe cards are backwards compatible, so 2.1 will work in a 1.0 slot.
Nobody is going to suggest a card without knowing the watts and amps of his power supply.
Found a link to the motherboard specs here
Dual-channel DDR2 memory architecture
2 x 240-pin DDR2 DIMM socket support up to 4 GB
Support DDR2 800/667 DDR SDRAM
Please read through the thread thoroughly before responding.
Nobody wants to read a wall of text, formatting is your friend.
i5 3570k | 8GB G.Skill 1600MHz | R9 290 | SeaSonic 750X