Mac Pro Power Overload? 4890

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Level 1

0 points

Mac Pro Power Overload? 4890

So I recieved my 4890 today and made it work fine in my Mac Pro Win & OSX with 2nd superdrive as power source.

Then I went ahead and installed a Accelero Twin turbo cooler. I took power from the second superdrive for the cooler in addition to powering the card itself.

Upon boot I had no display, no fan movement for 5 sec then all the fans in my mac pro started climbing in speed and stopping on 100% like a turbo jet.

So black screen and no matter what card I use (4890, 8800gt, 7300gt) with superdrive power disconnected, still black display and full tilt fans.

Is my power supply broken? did I somehow overload it?

im guessing this is a issue for my apple store but in a last attempt on saving alot of cash and 2weeks without computer I am asking you guys.

mac pro 2006 btw

Mac Pro 06, Mac OS X (10.5.7)

Posted on Jun 1, 2009 11:39 AM

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Answer 1

Nadav

Level 3

566 points

Jun 1, 2009 3:56 PM in response to oskari

Hello!

Did you try a SMC reset? I know that if you perform an SMC reset, it might make it work. Try that and report back.

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Answer 2

noice_T

Level 3

545 points

Jun 1, 2009 5:13 PM in response to oskari

First off, the 2006 mac pro PSU is 1000 watts; it would take a lot more than that to overload your psu. Moreover the 4890 is more power efficient anyway, so it would consume less than say a 4870.

It could be though, that you are overloading the power dedicated for sata. Why are you connecting the 4890 through the superdrive power anyway? Use the aux 6 pin pcie connectors. The optical drive power should only be used if you +have to+, like if you're running a crossfire setup, and even at that it's "iffy" (although someone on macrumors has a stable crossfire setup going like that).

The fact that this has somehow "bricked" the system, even after disconnecting everything and reinstalling an apple oem card, though worries me.

Using a 4890 under OSX requires messing natit.kext files, etc. something a lot different from just flashing a card. In this sense flashing is a lot cleaner.

I wonder too though if you should take this to the apple store or not. They might not even help you, and you'll waste a trip of lugging a boulder around. That's the one problem with flashing, hacking, etc. you're on your own if things go south.

On the brightside though, have you inquired macrumors members about this. Throw up a post there, if anyone can help they can.

http://forums.macrumors.com/showthread.php?t=661681

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