CPU cooler

It will fit the low profile ram but for the vengeance probably not.

Look at this picture, if your ram slots are below the heatsink it is definitely not going to work.
http://benchmarkreviews.com/images/reviews/cooling/silv...

i have 2 corsair 1300 mhz ram and 1 corsair 4gb vegeance which i used to the last slot of the ram will they fit

It will most likely fit if you use the last slot for the Vengeance ram module, anyways you got a link to your motherboard page? Can't find anything with that model name...If you do provide a page I can verify it will fit or not.

i have two mobo
1 = http://in.asus.com/Motherboards/AMD_AM3Plus/M5A97/
2 = http://www.gigabyte.com/products/product-page.aspx?pid=...

i also thinking about overclocking but i confuse bw two of them which is better for overclocking i have fx 8150

Well the vengeance will certainly fit with that spacing. Anyways for overclocking I will go with the M5A97. Might be better if you post that on the overclocking section if you want more answers, I am no wiz when it comes to overclocking