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Best video card, i3 2100, ipusb-cu H61, 6gb ram?

I am looking to buy a GPU for my desktop. I need something with dual monitor support (both displays are VGA and HDMI compatible). I play older games like Bioshock 1, Fallout New Vegas but wouldn’t mind being able to play newer games too.

I don’t mind spending money to get a better card, but I want to avoid getting something that is overkill for my system/needs. I would prefer not to upgrade my power supply if a decent card can be found within my power limits (250W), but I will upgrade if necessary.

My specs:
Processor: Intel i3 2100
Motherboard: IPISB-CU H61
RAM: 6GB
Power Supply: Bestec ATX-250-12Z Rev D7R, 250W

4-Pin power supply problem?

I was using a power supply that came from my computer (BESTEC ATX300 12E, 300Watts.) I tried to upgrade it to a new one (ULTRA XFINITY 600WATT ATX POWER SUPPLY.)
The motherboard requires a 20-pin connector, but this one is a 20+4, so I took the 4 off the plug (they were removable).

The plug of the 4-pin connector that goes from the power supply to the motherboard was different than the old one. I still tried to connect it (because by forcing a little the plug can go in in any way): but the computer didn’t turn on. When I unplugged ONLY this 4-pin, the computer started not completely (ex. CPU was turned on, but screen wasn’t, etc..).

When I put the other power supply back on, everything worked fine.

Would anyone know the problem? Thanks
Sorry a little correction: on the first sentence it’s not that came FROM my computer ,but it’s that came WITH my computer
Details for Jeffrey C:

I found a 6-pin connector (12 V) that looked like

o o o
o o o

I have checked and checked there is NO other 4-pin connector.
And the wires don’t have colors (they’re all gray)
Any help? Thx

New PSU to fit my HP a1620y?

I have a new HP coming in this week and I just bought a Connect3D X700 Pro 256mb PCI-E Graphic card. I’ve read many post that say a 300 watt power supply will work. The PSU in this computer is a Bestec ATX-300-12Z CDR. I’m not sure if it can handle the video card or not but I don’t want to risk it. It has dimensions of 5.5″ x 5.9″ x 3.4″. Can anyone recommend a PSU over 420 watt that would fit those dimensions? Thanks for the help.
I just got off the phone with TigerDirect and they said HP has proprietary PSU and I would have buy through them. Is this true?

Can I put this graphic card on my computer(2 Questions)?

1) Can I put this graphic card on my computer?
Graphic card:
http://www.bestbuy.com/site/EVGA+-+GeForce+GT+520+2GB+GDDR3+PCI+Express+2.0+Graphics+Card/3628056.p?id=1218421869680&skuId=3628056&st=graphic%20card&cp=1&lp=1

This is my computer
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01619697&lc=en&cc=us&destPage=document&dlc=en&jumpid=reg_r1002_usen

AMD Phenom x4 9650 Quad Core Processor
Windows vista 64 bit home premium
8gb memory, 750gb hard drive
300 watt power supply (Bestec)
1 PCI express X16 card slot
Motherboard: MS-7548 (Aspen)
Manufacturer: MSI
Chipset: AMD 780G

2) Also I don’t know what “ minimum of 18 amps on the 12V+ rail. “
the card says

„System Requirements
300W or greater power supply with a minimum of 18 amps on the 12V+ rail“

HP Pavilion a250n won’t boot?

I added a wireless card to the computer and vacuumed a little very carefully. When I put it back together, nothing happens when I pus the power button – no fan, no lights – nothing. The computer is completely stock, with the bestec atx-250-12z power supply. There is a green light on the back of the power supply that is blinking. When i disconnect all drive power cables, the light continues to blink, and when I disconnect the 4-pin power cable to the mobo it still blinks. Disconnecting the 20-pin cable to the mobo allows the light to glow continuously. My question is, what is broken? Power Supply or motherboard. I tested the front panel power switch and it is OK.
Thanks for the suggestions so far. According to the HP web site troubleshooting procedure, the power supply is good because the light is green with everything disconnected. I’ve now pulled the memory and all other cards and re-installed, and it is the same. Because the light only blinks when the mobo is connected, I’m pretty sure that is the problem. There are no visible shorts to the case, as justin suggested. Does anyone know if I replace with an aftermarket mobo whether this computer will work with the same windows XP installation? I know the windows XP with some brandname computers won’t work without the manufacturer’s mobo, and I may have to install a new copy of windows. I had to do this when I replaced mobo and processor in my son’s emachines.