AF140QE vs AF140L

Hi, can anyone tell me if there is any performance difference between the stock fans supplied with the 750D (I believe these are AF140L) and the AF140QE's when run at 12v? In particular I'm interested in air flow.

The reason I ask is that I have recently installed a H105 cooler and 2xGTX770's and I'm now finding that without sufficient airflow the heat from the gfx cards is affecting the H105's ability to hold my 4770k at 4.5 whilst remaining under 85 deg. I'm new to overclocking so I'm on a learning curve :)

nvm. I replaced the stock H105 fans with SP120's at the same time as the 2nd gfx card. Now I've setup the profile for SP fans correctly all is ok.