Please help me and my X1950XT AGP!

Hi Guys,

I posted a week or so ago on here about deciding to upgrade my 7800gs to a X1950XT, which I've now done - and here start my problems!
The card boots up fine in 2d, running at the lower 500mhz it does for 2d, the temp gradually rises up to mind 50's c and then sits there. As soon as i give it 3d and i believe it ramps the mhz up to 648/675 *neeeeou..* power down almost straight away.
I'm wondering if it's one of two things? I know these cards run ridiculously hot and will cut off when the do get hot, and this is a used card and i know they have the problem of the cooler 'peeling off' due to its weight, but can it really be a thermal cut-out 3 seconds after CCC says the temp is 54c?
The other thing i'm wondering is I've read these things need 30 amps. I have a thermaltake TR500 psu which has the PCIE connector, which I assumed would be sufficient to power it. I'm not sure what the amps are for the PCIE connector, but the 12v's are 15 each, here's the spec anyway; http://www.thermaltake.com/product [...] 009394.asp
Does it sound possible that it's my powerpack cutting out because it can't handle the draw when it goes up to 3d? If so, and my PCIE power is simply too weasely to cope, would I be able to use the 2 molex to PCIE connector I got, connect one to each 12v rail and get the juice out of it that way?

Any thoughts would be most appreciated!

I have the 6 pin PCI connector connected and the molex connector aswell. I have read that the molex just powers the TEC, so my question is really whether or not it's dying because the PCI connector from my PSU cannot supply enough ampage.

Ok thanks. I think I'll try hooking it up to both 12v rails and seeing if I can keep it at 500 mhz and then run some 3d for a while, just to satify myself it's not overheating or anything else, then I'll look for another PSU. Turning out to be a bit more expensive than I envisaged!