Dual Celeron Feat - Part 2

A dual CPU motherboard - I scoured all over SLS for a non-SCSI board and only the following could be found w/o ordering:

  • Gigabyte GA-6BXDS (S$550 VideoPro)
  • Asustek P2BDS (S$850 VideoPro)
  • DFI Dual CPU Non-SCSI ($395 Marketplace)

Two Celerons of course - Make sure both of them have the same S-codes and production codes just to be sure both of them can be overclocked. Also, remember to test them individually first!

After flashing your bios, if you still can't get your single-celeron to work on your dual motherboard, do not fret. Check your manual again. Some motherboards do require the CPU to be in a certain slot for single-CPU operation. For my case , my Gigabyte board required me to put the CPU in slot 2 for single-CPU configuration."

  • 128++ mb SDRAM - PC-100 specs if you want to overclock. S$295.
  • Drill bit - 0.4 or 0.5 mm, S$2.50
  • Hand drill - no power drill allowed, we are talking about precision drilling.
  • Solder + iron with a small soldering tip
  • 1 metre 0.26 teflon coated wire ($S1/m Sim Lim Tower)
  • And other acessories (in picture)

Technical Summary Before Starting
Let me give you a technical summary of everything we are doing :
CPU pin #BR1 (bus request pin 1,BTW there is also #BR0) is not connected to land B75 (side B pin 75) on the socket edge, which is necessary for the CPU to assert bus control if CPU ID is 1. Without it SMP is not possible.

However just linking #BR1 to B75 will not work too because #BR1 is connected to V-core which is supplied with 2.0 volts and 1.5 volts is needed for SMP operation. So we drill #BR1 away from the PCB and 'float' it (0v). Next we need to up it to 1.5V by connecting it to a spare contact of RP6.

Ok, now everything else in plain english (I hope) =)

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