HDMI + VGA vs HDMI + HDMI with old GPU

Hi, I'm trying to figure out what would be better for a dual monitor setup.

I've been using a GTX660 for my dual monitor setup, so HDMI to one monitor and VGA (via DVI-VGA adaptor) going to the second monitor. (My second monitor only has HDMI and VGA).
I have an old MSI Nvidia 9000 series with an HDMI output. This card is old and limited to about 100 Cuda cores.

Would using the outdated old card for an HDMI output for the second monitor be better for performance than using the VGA on the 660?
 
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