Upgrading HP Pavilion P7-1297c graphics card and PSU.

I am wanting to upgrade my computer's graphics card now as new current games require a lot more than the integrated A10-5700 graphics. I do know that since I want to upgrade my graphics card that it would also require to upgrade my PSU in order to power my whole unit. Games that I want to run to smoothly at 1920x1080, GTAV, Ryse son of rome, fallout4, Arma 3, etc.

Any graphics cards & PSU recommendation that would work with my rig and also play the current games with a breeze? My budget for both would be under $300

Thank you for your time!

Specs:
HP Pavilion P7 1297c specifications:
Product number
H2L87AA
Release date
4-Jun-2012
Country/region sold in
• United States
• Canada
Motherboard
MSI MS-7778 (Jasmine)
Figure 1: Motherboard top view

• 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)
• For more details, see Jasmine motherboard specifications .
Processor
AMD A10-5700
• TDP: 65W
• Operating speed: 3.4 GHz (up to 4.0 GHz turbo)
• Number of cores: 4
• Socket: FM2
Processor upgrade information
• Socket type: FM2
• Motherboard supports the following processor upgrades:
Processor TDP
Trinity Dual-Core A4-5300 65 W
Trinity Dual-Core A6-5400K 65 W
Trinity Quad-Core A8-5500 65 W
Trinity Quad-Core A8-5600K 100 W
Trinity Quad-Core A10-5700 65 W
Trinity Quad-Core A10-5800K 100 W
Memory
8 GB
• Amount: 8 GB
• Speed: PC3-12800 MB/sec
• Type: DDR3-1600
Memory upgrade information
• Dual channel memory architecture
• Four 240-pin DDR3 DIMM sockets
• Supports DDR3 DIMMs
• PC3-10600 (DDR3-1333)
• PC3-12800 (DDR3-1600)
• PC3-14400 (DDR3-1866)
• Non-ECC memory only, unbuffered
• Supports 1 GB, 2 GB, 4 GB or 8 GB DIMMs
• Supports up to 4 GB on 32-bit systems
NOTE: 32-bit systems cannot address a full 4.0 GB of memory.
• Supports up to 32 GB on 64-bit systems
NOTE: Maximum memory shown reflects the capability of the hardware and can be limited further in the operating system.
Video graphics
Integrated Graphics
*Integrated video is not available if a graphics card is installed.
• Supports PCI Express x16 graphics cards.
• Either integrated graphics or the PCI Express x16 slot are usable at one time; they are not usable concurrently.
• DVI and VGA ports (Can be used at the same time).
The integrated graphics differ by processor