720cpu AM3mobo ADVICE on DDR3 Memory please.

[Frank@uk]

Going to put together as follows...
X3 720 BE
MSI 790GX 65G

So AM3 Mobo and CPU I can get them both here at OCUK but its the Memory I need some advice on.
I'm thinking of DDR3 but the OCZ Dual Channel here http://www.overclockers.co.uk/showproduct.php?prodid=MY-109-OC&groupid=701&catid=8&subcat=1387 at £52 is OUT OF STOCK!!! Next step up is £80 but theres a few dodgey reviews on it.
I see that 6 Gb of Tri-Channel PC3 10600 here http://www.overclockers.co.uk/showproduct.php?prodid=MY-151-OC&groupid=701&catid=8&subcat=1390 is at £62.

Is it better for me to buy this 6Gb Tri-Channel memory and just use 4Gb of it? I'm sure I read something about needing to turn it into Dual Channel somehow is that right? If so, how?

It would mean I had 4Gb at £62 rather than the 4Gb Corsair Dual channel at £80.

I would like to dabble in overclocking my 720 CPU but need to save on spending too much on memory. False economy?

Sorry.... One more thing.
I'm thinking of using this 700W PSU http://www.overclockers.co.uk/showproduct.php?prodid=CA-030-OC&groupid=701&catid=123&subcat= I take it that will be good enough to power this combination. I haven't yet decided on GPU. I'm going to use the onboard HD3300 for now.

Thanks for any and all replies.
Frank.

 

[Frank@uk]

Thanks for reply Art.
So...be mindfull of i7 Tri-channel because there might voltage problems. OK but you said theres 4Gb DDR3 Dual Channel in clearance.. I saw this http://www.overclockers.co.uk/showproduct.php?prodid=MY-116-OC&groupid=701&catid=8&subcat=400 which is only 4Gb DDR3 for around £50 price but its got "intel" written all over it!
Bit confussed (feeling like n00b) is this memory OK for my proposed setup?

I'm using Windows XP and I gather it only recognises 3Gb of memory. Perhaps I should just buy 2Gb DDR3 Dual Ch' for now.

 

[Frank@uk]

Cheers Art. Appreciate the replies.
You know what its like.... you've got to try and cap the spending or it'll get way out of hand. "Ooooh. If I just spend £30 more here and £20 more there..." etc.