I want to buy 2 modules -  
1)- 2GB 800mhz patriot
2)- 1GB 800mhz patriot
If i install them on diffrent channel on my MB(ABIT IP35P INTEL P35 FSB1333 DDR2 1066) will they work in dual channel even if their capacity isn't the same??
I read in wikipedia (http://en.wikipedia.org/wiki/Dual-channel_architecture) that it can work...
Can you please advise me?
 
thanks  
 
Uri

Buy a 2x2GB set they are dead cheap theese days.

I know, but i need to cut off my budget.
Does anyone can answer my question pleassse?

In UK 2GB+ 1GB (£34+26) costs more than 2x2GB (£59)for corsair memory.

I'm about 80% sure on this, yes it will work.  (but only with Intel system, I think AMD systems need equal ram amounts.)
 
I agree with Ainarssems, get 2x2GB.  If you are looking to save money, post what you want to get.  There are probably other ways to save money then buying odd ram amounts.

This is what i'm getting:
 
ABIT IP35P INTEL P35 FSB1333 DDR2 1066
INTEL E8400 3.0GHZ CORE2DUO 1333MHZ 6M BOX
320GB 16MB SATA II 7200 AAKS WD
DDR II 2GB 800Mhz CL5 HEATSINK PATRIOT X2
DVRW NEC 7200S X 20 SATA BLACK
CASE BRIZA 6097 450W 20/24PIN + FILTER BLACK
GIGABYTE 8800GTS 512MB
 
(the 8800gts costs 20$ more then the 8800gt, so i thought i should get it).
 
thanks a lot
Uri

You should get memory as a set of 4GB (2x2GB). It will be cheaper than 2 single 2GB sticks and also guaranteed to work correctly together. Like I mentioned earlier 2GB stick of the same  corsair memory here is £34 and 2x2GB set is £59 so it is £21 cheaper to buy as a set then 2 separate.

I'm already buying them as 2x2gb.
as i wrote above  

http://www.newegg.com/Product/Prod [...] 6813128084
 and get the 8800gt. 8800gt performance really isn't far from gts. you can cover most of the gap by o.c.  that should save you enough money to cover the ram.

 
yeah dont do stupid s#1t and get unmatched, get a proper totally matching set to do the job and make use of the performance dual channel offers.

Uri, you're forgetting a decent power supply.  Any "free" power supply that comes with the case will just cause problems, and may damage your MB or other components.  Since your budget is very limited, this should get you by: ($30 after rebate) http://www.newegg.com/Product/Prod [...] 6817371006
 
Also, IMHO you're overspending on the CPU: get the e7200 instead and save about 1/3.  It overclocks really well.
 
Your MB choice is inexpensive, but may have some problems, especially with overclocking the FSB.  I'd go with a Gigabyte GA-EP35-DS3L or better yet the GA-EP35-DS3R, which has more robust power circuitry.  
 
If you need to save more money, don't spend over $200 on an 8800GTS 512MB, but rather get an 8800GT 512MB for $140 after rebate: http://www.newegg.com/Product/Prod [...] 6814150280

 
Good spot there mate, cheap psu's are rubbish and prolly wont even power that system, and agreed with the rest.