New gaming system : RAM recommandation needed

[FunestoLeClown]

Here are the parts I bought:

• Intel Core i5 750 Quad Core Processor Lynnfield LGA1156 2.66GHZ 8MB Cache Retail Box
  
• Sapphire Radeon HD 5770 Vapor-X 860MHZ 1GB 1.2GHZ GDDR5 PCI-E 2XDVI HDMI DisplayPort Lite Video Card
  
• Corsair VX550W 550W ATX 12V 41A 24PIN ATX Power Supply Active PFC 120MM Fan
  
• Antec Six Hundred Mid Tower Gaming Case 600 ATX 3X5.25 6X3.5INT 1 SATA Hot-Swap Bay No PS
  
• Gigabyte P55A-UD3 ATX LGA1156 P55 DDR3 2PCI-E 2PCI RAID GBLAN CrossFireX USB3.0 SATA3 Motherboard
  
• + a SATA 500GB hard drive I already had

Considering the above parts (which won't be changed) and keeping in mind that it is a gaming PC, what RAM would you fit in there? I don't want my memory as the limiting factor of my system.

I would go with Kingston Hyper X 2X2048 Megs 1600Mhz Ddr3, but I wanna hear you guys (don't want to go too much over $200).

Thanks in advance:grinthumb.

 

[dustin_ds3000]

you can go wrong with these CORSAIR DOMINATOR-GT 2 x 2GB DDR3 1600 7-7-7-20 Timing $212.99

 

[Ritwik7]

I don't think it's necessary to get such expensive memory modules.

I would recommend these instead.

 

[FunestoLeClown]

Intel's site says that the i5 750 has:
Processor Base Frequency 2.66 GHz
Max Turbo Frequency 3.2 GHz

I have also been told that its FSB is 1333 MHz (default). Am I right saying the processor base frequency of 2.66 GHz is 2x (FSB) 1333 MHz, and therefore max RAM SPD is 1600 MHz (3.2/2)?

Does it mean that any RAM over DDR3-1600 will downclock to 1333 MHz (base) or 1600 MHz (max turbo)?

My friend who had recommended my PC parts had told me to buy DDR3-1800; if my above "theory" is right, it would be useless, right?

 

[FunestoLeClown]

Well, I guess my technical knowledge is not very good and I should have talked about BCLCK, which is, in the case of i5 750, 133 (x20 = 2667). Anyway, is my reasoning correct saying with 3.2 GHz processor speed, max RAM SPD is 1600 MHz?