What kind of memory does the 3540/3520 Quad Mac Pro support? Will it work with these Kingston Registered ECC dimms? http://shop.kingston.com/PartsInfo.asp?ktcpartno=KVR1066D3Q8R7SK2/8G If not, are there others that will work at this time? Is the 8GB memory limit on the Quad's thought to be due to DIMM capacity (e.g. attributable to readily available 2GB DIMMS) or some limit on the memory controller?