Will A AMD Radeon 6850 fit into my HP p7 1455 computer?

I have a Hp p7 1455. i am looking to upgrade to a better graphics card. i have a Nvidia Geforce GT620 in there now. i was wondering if my computer can fit a Amd Radeon 6850?

Specs

- Amd Apu A10-5700 3.4 ghz

- 8 gigs ram

-Nvidia Geforce gt620

-ATX (Case)
Height: 39.4 cm (15.55 inches)
Width: 17.5 cm (6.89 inches)
Depth: 40.9 cm (16.14 inches)
Weight: 10.9 Kg (24.03 lbs) - without packaging

-300W PSU

- Motherboard

Manufacturer: MSI
Form factor: uATX - 24.4 cm (9.6 inches) x 24.4 cm (9.6 inches)
Chipset: AMD A75 FCH
Memory sockets: 2 x DDR3
Front side bus speeds: UMI 5 GT/s
Processor socket: FM2
Expansion Slots:
1 PCI Express x16 (Gen 2.0)
3 PCI Express x1 (Gen 2.0)
1 PCI Express Mini Card (Gen 2.0)