Re: Power supply
- From: Paul <nospam@xxxxxxxxxx>
- Date: Fri, 24 Aug 2007 18:28:30 -0400
John Manning wrote:
I currently have an Asus P4B533E MB(SKT 478 AGP) with a P4-2.26 CPU. I want to replace this MB with an Asus P5K-E/WIFI-AP and an Intel E6750 CPU and an nVidia 8600 GTS of some type. Will I need to replace my current 500 watt cpu or can I use some kind of adapters to convert the 4 pin connectors to 6 pin for the video card and will the MB have connectors to accepts 4 pin plugs to make up for missing pins on the main power cable?
Thanks,
John
Old power supply
20 pin main connector
4 pin ATX12V connector (two yellow wires, two black wires)
New motherboard and video card
24 pin main connector
4 pin ATX12V connector (two yellow wires, two black wires)
2x3 PCI Express for video card
You don't need to use a 24 pin power supply. A 20 pin connector can
be placed in a 24 pin motherboard. Pin 1 goes to Pin 1.
Typically, when the 24 pin is really needed, is if you are using two
video cards in SLI or Crossfire mode. At that point, two video cards can be
drawing 4 amps each from the motherboard 12V rail, and then it helps
to have the 24 pin connector which has two 12V pins on it. The current
rating of the pins is 6 amps each. A 20 pin connector has one 12V pin.
A 24 pin connector has two 12V pins. The PCI Express slots are powered
by the main ATX power connector. Video cards like to load up the 12V rail.
The 4 pin ATX12V connector should still work for your processor. The
E6750 is 65W, and the 4 pin ATX12V is plenty, in terms of current flow.
http://processorfinder.intel.com/details.aspx?sSpec=SLA9V
The 8600GTS is 47 watts.
http://www.xbitlabs.com/articles/video/display/geforce8600gts_7.html
The external power connector carries 29.10W according to this.
29.10W / 12V = 2.4 amps on PCI Express 2x3 connector.
http://www.xbitlabs.com/images/video/geforce8600gts/8600gts_power_full.gif
Even a cheap 1x4 Molex to 2x3 PCI Express adapter would be sufficient
for that low of a current flow.
A further check, is to analyse what is written on the label of the
supply. Unless your 500W is one of those lousy Powmax from 5 years
ago (really weak 12V output), chances are the current rating on the
label is high enough for the hardware you have identified so far.
Paul
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