GPU upgrade

Hello,
Currently I'm enjoying the following rig:
AMD Phenom II X4 945 @ 3Ghz with an MSI 790 GX-G65 MoBo, 4GB of DDR3 RAM, Asus GeForce GTX 275 with 896Mb DDR3 and the power comes from a Cooler Master RS-460-PCAP-A3.
I want to upgrade the GPU and I was thinking on a Sapphire HD7870 OC. The budget is roughly 250-270$.
I would like to know if there will be any compatibility or bottlenecking issues with the current specs and the new GPU.
Any suggestions are welcome.
THX.
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