That board has a 945GC chipset which wasn't intended for the Core2 series at all. A few mainboard manufacturers like ASUS and ASROCK pushed the chipset to it's limit, adapted the boards VRM specs and achieved Core 2 Duo support. So I guess it may be possible to use a dual core LGA 771 Xeon in there.
The Xeon L3014 is a LGA 771 single core 45nm CPU with 2.4GHz, 3MB 2nd level cache and 266MHz FSB, right? So it's like a crippled Core 2 Duo E8200 with only one core (and half of it's 6MB Cache) and 266MHz instead of 333MHz and 2.4 instead of 2.6 GHz. Not sure if anyone tried the mod with this CPU yet but it may work.
Since the specs are pretty low it should work with any board and chipset that takes this LGA 771 Mod. Not sure what microcodes are needed, so you may have to look for the CPUID for that CPU.
The mentioned GA-EP45T-UD3P should work since it works with this mod. You may have to update the microcodes to get SSE 4.1 and VT-x as well as EIST fully working.
As far as my knowledge goes the GA-EP45T-UD3P is one of the best LGA 775 Boards around and should give you 500+ MHz FSB for quad CPUs and maybe event 600+ for dual core CPUs.
The ASUS P5KC has the P35 chipset and shouldn't be too bad either. But I doubt that you can reach the OC of that EP45.
There is a large (mainly technical) discussion (in this thread a few pages back) about the X38/X48 currently NOT supporting this mod. We don't know why but right now it seems not possible even with the updated microcodes to get a LGA 771 Xeon running in these boards. Also most of the Qxx chipset boards seem to not work. So Gxx, Pxx or maybe the old P965 chipsets are the ones that should work (if the BIOS supports it and/or can be modded).
Edited by Bucho - 3/12/14 at 5:08am