I have my new graphics cooler and have reinstalled all cooling on my server - all temps are now excellent, so that's sorted.
Have changed my server over to 2 single core clients, as it wasn't making all of the SMP deadlines and I decided against overclocking it.
The new motherboard works fine, I've tested it - I just need to find time to do a fresh install of Windows so I can use it, now. Also ordered new chipset coolers for it, as the current northbridge cooler on the board blocks my CPU cooler and is ineffective, the southbridge doesn't have a heatsink and got very toasty whilst I was testing.