On Mon, 2006-10-16 at 13:31 +0100, James Wilkinson wrote: > Gilboa Davara wrote: > > and 64bit P4/Xeon will suck badly in 64bit mode. > > Worse than in 32 bit mode? Interesting. Do you have any figures to back > that up? > > Thanks, > > James. The P4/Netburst family is not known for being a very efficient core to begin with - adding the EM64T (or as I like to call it, iAMD64) hack to the Prescott (PresHot) and the Nocona cores didn't really improve things either. I assume that finding benchmarks on the Internet about P4 vs AMD64 in 64bit shouldn't be too hard to find. Either way, I tested my own software on a number of cores ranging from Opterons, P4 Xeons, Woodcrest Xeons (Core2), and the only CPU to show a massive performance drop was the P4. Never the less, as I said, YMMV. - Gilboa
