What spec T30 are you looking at?
You might be able to DIY something better or more powerful for the same money
I would be very tempted with a dell or ibm machine second hand.
There is a dell precision system atm with 2x low wattage xeon and 64gb ram for £250Fairly common as companies dump old stock. This is not rackmount to keep the noise down. £30 on a sata adaptec raid card.
The 6 core low power xeons are £25 for 2, should 2*4 physical cores not be enough![]()
Which 6 core CPU model are you looking at for that?