2 channel vs 4 channel -very noob help

[rogue_shah]

Hello, I am buying a pc for gaming purpose,may be some video editing I am a very noob with very little background of computers or any significant local help.
I am confused, should I buy a mobo with 4 dimm slots, put 1x4gb 667 mhz ddr2
or I buy mobo with 2 dimm slots put 2x2gb 800 mhz bus ddr2 ?
(as my finances are limited )
[yes i intend to put a decent video card atleast 9600GT]
Thanks in advance.
P.S I am from Pakistan, I will go to another city (karachi to buy the desired system)
here is their website, if you wanna take a peek as reference to Ebay is very irrelevant to me.
http://galaxy.com.pk/forms/motherboard.htm
http://galaxy.com.pk/forms/gmemory.htm

 

[pr2thej]

take the 4 DIMM board with the 2x2GB sticks, gives you option to upgrade.The slots are more often than not colour coded so you cant really install them wrong

 

[rogue_shah]

but with a 4 dimm board ,I can only afford to put a 667 mhz ddr2,
while in a 2 dimm board I can afford to put 800mhz ddr2, wont that contribute to any significant difference in performance?

 

[Sad Panda]

http://www.tomshardware.com/reviews/PARALLEL-PROCESSING,1705-12.html

In short, there is very little difference between dual channel and single channel ram.

Therefore, my expectation is that DD2 800 single channel will outperform DDR2 667 dual channel ram, but the article doesn't test that theory.

Further Reading: http://en.wikipedia.org/wiki/Dual-channel_architecture