64Gb is too much I think, because BURP workunits are multithreaded, so it takes only 1 WU to take over all your cores. These BURP WUs are demanding in terms of memory and a PC with 8Gb only won't be able to download them as the BURP server replies that the PC does not have enough RAM. But I think 64Gb would be overboard, it may take up to 20Gb already with windows 7 also memory hogging, but it would not reach 64Gb any time soon.