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Old 02-28-2007, 05:42 PM   #1 (permalink)
Newb Techie
Join Date: Feb 2007
Posts: 3
Default Need psu info please

How can I make sure that my 400 watt psu with 16 ampere on 12v+ rail will be able to run my BFG 7800 GS AGP card without performance or stability problems?

I have:
- 1 Samsung HDD 160 Gigabyte
- 1 Optical DVD drive 16 x
- Pentium 4, 3 Gigahertz HT, 1 mega-cache
- 2 x 512 Mb Kingstone Ram.
- MSI motherboard (BBG)
- Hansol 19" monitor
- Microsoft Keyboard and Samsung optical mouse

Based on this site:

I have concluded that my 7800 GS will consume about 4.25 ampere from the 12v+ rail.

The only thing that confuses me is that BFG recommends 20 ampere on the 12+ volt rail. Why? And what is the REAL estimated ampere usage for my card?

My PSU specification: From


* 400 Watts Pentium Ready Power Supply
* 20 pin + 4 pin ATX-12V Power Connector
* Single Sleeve fan design
* Thermal Fan Control for low noise
* Japan-Iron Case
* OVP/OCP/SCP on all 6 DC Outputs


Metric 145 x 150 x 86 (mm)
English 5.7" x 5.9" x 3.3"

Input Voltage

95~132 Volts or 190-264 Volts AC

Output Voltage
+3.3V +5V +12V -12V -5V +5SB

Max Current Output
26A 40A 16A 1.0A 0.8A 2.5A

Max Combined Wattage
220W 192W 12W 4W 12.5W

Total Wattage 400W

iamarto is offline  
Old 03-01-2007, 07:41 AM   #2 (permalink)
Newb Techie
Join Date: Feb 2007
Posts: 3
Default please

It's the first time I post here.. don't dissapoint me guys please...

Even if the topic is a duplicate, at least show me the link where I can extract the info I need.

Thanks in advance,

iamarto is offline  
Old 03-01-2007, 08:03 AM   #3 (permalink)
Wizard Techie
Join Date: Jan 2005
Location: Delaware
Posts: 3,475

It will be able the power the system but it won't last long. The Fortron 450w would be a good choice for the $$$.
turtile is offline  
Old 03-01-2007, 10:51 AM   #4 (permalink)
Newb Techie
Join Date: Feb 2007
Posts: 3
Default dangers?

What do you mean won't last long? The card or the psu? Is there any danger on my graphics card if it receives low ampere? Like it won't power up the card's fan enough or the components will heat up for example?
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Old 03-01-2007, 12:36 PM   #5 (permalink)
Wizard Techie
Join Date: Jan 2005
Location: Delaware
Posts: 3,475

The power supply may die after a while. It can take out the sytem with it at the worst or it will just die and you can add a new one in.
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