slight burning smell coming from gpu

[coolmanfoo]

Hey everyone so i just installed an SLI setup with 2 680s. one of them has 2 huge fans on it and i also just installed 2 new fans in my case to cope with the extra heat. So basically after playing crysis 3 i noticed that my hottest 680 was only about 75C and my cpu 65C but there was a faint burning smell coming from the pc (not the psu i checked) should i be worried or is it just the new plastics getting broken in? thanks!

 

[coolmanfoo]

So ive actually narrowed it down to my brand new 680 which is http://www.newegg.com/Product/Product.aspx?Item=N82E168... i just got it in the mail and it runs everything amazingly. Should i be worried about the smell or is it fairly normal? its not like a smokey smell and there is absolutely 0 smoke it just smells like hot plastic.