Pci-e 2 graphic card on pci-e 1 motherboard

hhf

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Oct 21, 2011
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hi!
ai have a AMD x2 3800+ processor, 2 gb RAM and Asus M2N-X motherboard with PCI-E x16 1 slot and i want to buy a PCI-E x16 2.1 graphic card (Radeon 5570 or Radeon 5670)- budget limited
Question 1:
Will i be able to enjoy the full power of the graphic card with PCI interface Express1?

Question 2:
given that the motherboard is a PCI Express x16 1 and the graphic cards are PCI Express x16 2.1 is worth buying radeon 5670 which is more expensive than the Radeon 5570?
 
HD 5670 is 2.1, and as far as i know there's no difference between PCIE 2.0 and 2.1
From Wikipedia
PCI Express 2.1 supports a large proportion of the management, support, and troubleshooting systems planned for full implementation in PCI Express 3.0. However, the speed is the same as PCI Express 2.0
 
From AMD
627 million 40nm transistors
TeraScale 2 Unified Processing Architecture
400 Stream Processing Units
20 Texture Units
32 Z/Stencil ROP Units
8 Color ROP Units
GDDR5 memory interface
PCI Express 2.1 x16 bus interface
DirectX® 11 support