since u guys are suggesting day 6750 will work on my cooler master Cm350
so I would be buying 6750
I do not know who is suggesting the 6750 to you. Did you read Urban Legend's post?
I hope the power supply has at least one (1) 6-pin power plug..
It seems the Cooler Master 350W doesn't based on this:http://www.coolermaster-usa.com/product.php?product_id=2968
If you mean another cooler master 350W model, post the link here so we can make certain. As mentioned many times, the 7750 is the safest bet. I can only see $10 difference in price (newegg) between the 6750 ( $90 but require 6PIN ) vs the 7750 ($ 100 but does not require 6PIN). Why not go for the simplest solution & get 7750? The $10 is worth it.