I have an Dell XPS 420 that came with an 8800 GTX 768mb and a 425w power supply.
A few days ago the 8800 card became too damaged to start the computer up, so I'm in the hunt for a new card.
I'm concerned about the 450w and 24A requirement for the GTS 250.
Here are the specs for my Dell power supply:
Input: 100-240 ~ 17A 50-60Hz
+5V==/22A max -12V==/1A max
+5V(FP)==/4A max +3.3V==17A max
+12VA==/18A +12VB==/18A +12VC==/18A
combined power on +3.3V and +5V rails not exceed 150w
combined power on +12VA and +12VB and +12VC not exceed 410w
max continuous total DC output shall not exceed 425w
Model Number: L425-00
I'm not sure of the 12v rating on the card, but 410/12 = around 34.. does that sound right? Is this enough for a GTS 250?
If is worth a try because it is very close. However, I found that even on my high quality 450W corsair PSU was not able to give the card enough power (which I thought was very stange). I would recommend 500W+ PSU just to be sure!!
34amps is for the consumption for the entire PC....and it really doesn't need that much. As long as you have 20amps, you're good to go.
The 8800GTX is power hungry, so yes, you should be fine...I think even a single GTX260 should be fine.
The connectors just determine how much energy it needs. The 9800GTX/GTX+/GTS250 are all basically the same card. The latter just use slightly less energy than the former. Since the former card just slightly used more energy than what could be delivered via the slot and 1 connector, it required 2 connectors. So reducing its power consumption slightly allowed it to only run on 1 connector.