Yes, the high memory setting does cause problems with the stable client. It "hangs" causing Chessbrain to use 100% of the idle power, but not actually process any position. I did not hear of Carlos fixing it, but I also haven't heard it reported in a while, so its more then likely been fixed in the experimental clients.
Using more memory only gives small improvements in speed. The memory is used as a cache for positions. The problem is, there are many more positions then any computer could possibly cache, so there is only a small chance that your position will hit, in the cache. For this reason, there is little difference what memory setting you choose.
Using more memory only gives small improvements in speed. The memory is used as a cache for positions. The problem is, there are many more positions then any computer could possibly cache, so there is only a small chance that your position will hit, in the cache. For this reason, there is little difference what memory setting you choose.