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?
- 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 Topower.com
* 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
DIMENSION (L x W x H):
Metric 145 x 150 x 86 (mm)
English 5.7" x 5.9" x 3.3"
95~132 Volts or 190-264 Volts AC
+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