dota 2 fps and graphic card

Solution
you will want DDR2 RAM, it would appear that you have a 1 GB and a 2 GB stick right now. so you would want a 2 GB stick, which you would put in instead of the 1 GB stick. this is all based off the fact that you have that above motherboard with only tow RAM slots. get the standard DDR2 667 MHz RAM, and it should work just fine.
I am thinking it is your lack of RAM and rather weak processor. I would recommend more RAM, and if possible a faster CPU, having started out on a e6600 @2.4GHz, it really made a difference when I got a faster core two duo, later I got a quad one which helped more. Dota apparently wants minimum 4 GB of RAM.
 

holyprof

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If you install 1GB more, it will make a difference because with only 2.75 usable you probably have only 1.5GB free for software to run. Your GPU isn't very fast as well, but should be good for DOTA 2.

Having only 2.75GB usable also bothers me, is your motherboard integrated gpu active and using 256MB of RAM?
 
you will want DDR2 RAM, it would appear that you have a 1 GB and a 2 GB stick right now. so you would want a 2 GB stick, which you would put in instead of the 1 GB stick. this is all based off the fact that you have that above motherboard with only tow RAM slots. get the standard DDR2 667 MHz RAM, and it should work just fine.
 
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Grimwinder

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holyprof

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If the motherboard doesn't support more than 667MHz, you won't get any advantage from faster RAM. Anyway, i never encountered problems from running 800MHz RAM on 667MHz motherboards and even mixing them. Hope your upgrade goes well, good luck!