simply because how would they fit it all in with the heat to consider have you seen the size of a cpu and the size of the sync and fan needed
As for heat of these desktop GPU's yes they get hot, but they are sort of designed for such heats and usually use a low fan speed by default
Well It will produce quite a bit of heat... at least 212 degrees Fahrenheit as that is the required temperature to create Steam
*bah dum chh
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