Upgrading question Help

[Kioki Sampai]

I currently have this build


Case 1 x AZZA Atlas Gaming Case - Black
Processor 1 x Intel® Core™ i7-4770K Processor
Processor Cooling 1 x Standard 120mm Fan
Memory 1 x 16 GB [8 GB x2] DDR3-1600 Memory Module
Video Card 1 x NVIDIA GeForce GTX 760 - 2GB - Single Card


Motherboard 1 x ASUS Z87-K -- 1x PCIE 3.0 x16, 6x SATA-III 6Gb/s, 2x USB 3.0
Power Supply 1 x 500 Watt - Standard
Primary Hard Drive 1 x 1 TB HARD DRIVE -- 32M Cache, 7200 RPM, 6.0Gb/s - Single Drive
Optical Drive 1 x [12x Blu-Ray] LG BLU-RAY Reader, DVD±R/±RW Burner Combo Drive - Black
Sound Card 1 x 3D Premium Surround Sound Onboard
Network Card 1 x Onboard LAN Network (Gb or 10/100)


And i want to take out the gtx 760 and replace it with 2 amd R9 270x running crossfire but i am worried i dont have the right pcie cables that came with this build because i am a noob and not sure it says "pci express" and the 1 next to it says sli ready but its for the nvidia so i want to know what i would need to buy to make the 2 r9's work in here, i know i would need like a 700w+ power supply and the crossfirex bridge. Help :3

 

[Wolfshadw]

Per the specs of your motherboard, it states that it's quad-Crossfire compatible, so there shouldn't be any issues with the motherboard supporting it.

-Wolf sends

 

[Kioki Sampai]

so when i buy the graphics cards do i need to buy pcie cords or should they come with it i am just confused about that part

 

[Wolfshadw]

That will depend on your power supply. If the graphic cards require external power connections from the power supply, you'll need a power supply that can provide those power connections. Based on your 500watt power supply (really need full spec or make and model number here), I'd recommend replacing it as well.

-Wolf sends

 

[karlsanada13]

I am pretty sure AMD doesn't need crossfire bridge anymore. Anyway. Get atleast 700w with the right amount of PCIE connectors to make it work,

 

[Kioki Sampai]

yeah i was going to buy this power supply http://www.amazon.com/Erp750-ps-Certifications-Crossfire-Efficiency-Protection/dp/B00IZEYITM/ref=sr_1_7?ie=UTF8&qid=1402536720&sr=8-7&keywords=700w+power+supply