njub

Okay, but I've going to do that after I install OS X, right? Also could you give me some tutorial for installation? I plan to install Yosemite 10.10.5

Okay, I typed lspci -nn in terminal and got this:
 

00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller [8086:0150] (rev 09)
00:01.0 PCI bridge [0604]: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port [8086:0151] (rev 09)
00:14.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller [8086:1e31] (rev 04)
00:16.0 Communication controller [0780]: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 [8086:1e3a] (rev 04)
00:1a.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 [8086:1e2d] (rev 04)
00:1b.0 Audio device [0403]: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller [8086:1e20] (rev 04)
00:1c.0 PCI bridge [0604]: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 [8086:1e10] (rev c4)
00:1c.4 PCI bridge [0604]: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 5 [8086:1e18] (rev c4)
00:1d.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 [8086:1e26] (rev 04)
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 PCI Bridge [8086:244e] (rev a4)
00:1f.0 ISA bridge [0601]: Intel Corporation B75 Express Chipset LPC Controller [8086:1e49] (rev 04)
00:1f.2 IDE interface [0101]: Intel Corporation 7 Series/C210 Series Chipset Family 4-port SATA Controller [IDE mode] [8086:1e00] (rev 04)
00:1f.3 SMBus [0c05]: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller [8086:1e22] (rev 04)
00:1f.5 IDE interface [0101]: Intel Corporation 7 Series/C210 Series Chipset Family 2-port SATA Controller [IDE mode] [8086:1e08] (rev 04)
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Turks PRO [Radeon HD 6570/7570/8550] [1002:6759]
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Turks/Whistler HDMI Audio [Radeon HD 6000 Series] [1002:aa90]
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 09)

I belive this is extact model of my graphic card:

Here is what I have in my pc:

- Motherboard: Asus P8B75-M LX
- CPU: Intel dual-core i3-3220 CPU @ 3.30GHz
- GPU: Radeon HD 6570/7570/8550

Beside that I have SSD(64gb), 500gb hard disk. I am not sure how important is that but I just wanted to note.

I want to install OS X mostly bescause I want to do iOS development in XCode.

Thanks