No, the Intel (Ausberg) 915G motherboard will not support dual core processors.
The Intel (Ausberg) 915G motherboard uses an Intel 915G motherboard chipset,http://support.gateway.com/s/MOTHERBD/Intel2/102007/102007sp33.shtmlhttp://en.wikipedia.org/wiki/List_of_intel_chipsets#Pentium_4.2FPentium_D.2FPentium_EE_Chipsets
Supports only Single Core processors.
It isn't until the Intel 945G motherboard chipset, that Dual Core processors are supported.
The Intel Celeron D is a Single Core processor.
The Intel Pentium D is a Dual Core processor,
Intel Celeron D,http://en.wikipedia.org/wiki/Celeron_D#Celeron_D
"The Intel Celeron D processor works with the Intel 845 and 865 chipset families. The D
suffix actually has no official designation, and does not indicate that
these models are dual-core. It is used simply to distinguish this line
of Celeron from the previous, lower performing Northwood and Willamette
series, and also from the mobile series, the Celeron M (which also uses
3xx model numbers).
Unlike the Pentium D
, the Celeron D is not
a dual core processor."
Intel Pentium D,http://en.wikipedia.org/wiki/Intel_Pentium_D
Don't 'shoot the messenger'. I just state the facts.