Connecting two external monitors to my Retina Macbook Pro 2012 has no problem except for more fan noise, which is a little bit annoying since with one external monitor one doesn't hear the noise at all.
I'm wondering what's the cause of this? What is the bottleneck here? Is it because GPU Clock Speed or Memory of Graphics Card?
rMBP 2012 has Nvidia GeForce GT 650M with 1 GB GDDR5. If I switch to rMBP 2013/2014 which has Nvidia GeForce GT 750M with 2 GB GDDR5 and say the problem disappears, is it mainly because of higher GPU speed or more memory?
Btw, 650M scores 1278 while 750M scores 1461.
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