Video card WITHOUT additional power - is it compatible with my motherboard?

Question

Iron

Hello.
There is a Necro PC based on the LGA775 platform
Features:
- Asus P5KC
- 8GB DDR2 (OC 1.9v 930MHz 6-5-5-18 CR2)
- Intel Xeon E5462 (OC 1.200v 540FSB 3.2GHz)
- FSP PNR-I 500 (400 real -
ATI Radeon HD4850 ​​512MB 114W -
SSD 120GB HDD 700GB

75 watts via PCI-E 1.1 slot on older motherboards

Will take off or not? The pay is good

Answer 1

it will pull without problems (there is no difference in power supply)
the limit is only in the bandwidth of the GB / s bus,
i.e. performance "rests on the bus", and not on the video chip or percent.

Answer 2

I looked at the PCI-E 1.0 pinout now, and the answer is - almost certainly not . There are only three contacts for +12 volts, and only two of them are power (the third is service).
If, as you write, the power consumption is 75 watts, then the total current consumption will be more than 6 amperes - this is more than 3 amperes for each of the contacts. And the edge contacts on the edge of the printed circuit board from such a current, of course, will not burn out immediately, but they will not provide reliability, in my opinion.
But... If you have a penchant for handicrafts, you can try to adapt the Molex connector from the HDD (without 5-volt pins) to it, this will be enough. Finding 12 volt lines on board and soldering to them is a simple matter.