Internal power - what kind of molex plug do I have/need?

Hi all!
A quick question that I haven't been able to find the answer to:
Like so many others, I recently lost the 1900XT graphics card in my 1st gen Mac Pro (it's toast).
I replaced it with a flashed PC card - the 4870 (1 Gig).
Since I have a flashed PC card, I guess I'm not totally confident that it will control it's own fan speed accurately, since it's not meant to run on a Mac, and I don't want to lose another card to excess heat (the card seems to get REALLY hot really quick, but I never paid much attention to how the air was coming from the 1900XT, so I don't have a good basis for comparison)
So my question is two-fold:
1. Do I have any reason for concern, or is a flashed card going to monitor it's own temperature fine, and adjust the fan accordingly?
2. Is the extra PCI-slot fan I bought at a local PC shop necessary, or even compatible with my Mac Pro? It seems to have a huge molex connector (around 1 inch - the "old" kind apparently) while my Mac Pro seems to only have smaller molex... Do I need an adapter to put this thing in?
Can you tell I'm paranoid to lose another video card to heat? I don't have the $$ to do this again...
Thanks for your help!

Why don't try the ThinkVantage System Update program to automatically look for drivers?
And have you installed the Intel graphics? If your machine has Nvidia Optimus you also need to install Nvidia driver.

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