The Asus site say's 1, 4, 5 are correct.
VT is for running theings like Windows Virtual PC
.5 Multiplier, since your cpu is 11.5, I assume it will run at 11, aka E7500
L2 cache size, I can't see this being a problem, you know what it is when you bought.
I think since the 975 chipset is very old there no way they can work around these issues, Asus are good at supporting things but this is a chipset limitation.
Thank you for your help and explanation on this matter