lol, people have listed games that CAN use quad cores, but none need them. boost from dual to quad core in sup com is minimal and its the style of game that will have the biggest boost from extra cores. quad cores won't be needed for some time, utilised yes, but 100% of two cores, can be spread to 50% on 4 cores, but use no extra power, which is so far all is being done. but 99% of fps's won't even use dual cores maxed out, sup com is rare breed of cpu limited games, and even then its barely limited.
as for penryn, nothing to exciting, little in terms of benifits from anything except 45nm production. nehalem is being massively overhyped, people think the onboard mem controller will somehow make it massively faster. ath 64 only had a major advantage over an incredibly slow access p4's. core architechture has a lot , and i mean a LOT of transistors and logic dedicated to predicting and prefetching data so it is infact almost on par with memory access of the ath 64. by putting memorycontroller ondie most of that logic becomes fairly useless, so ondie mem controller is mostly going to be REPLACING logic on the die, not adding to and massively reducing latency, so benifits will be very very marginal. cheaper northbridges and probably a switch over to single chipset intel boards like amd boards is quite possible.
but theres a lot of indications the onboard mem controller will be limited to xeons, and xeons rebadges as extreme editions, as opposed to all down the range. which is very possible. for little benefit, other than marketing same features as amd, they will lose a heck of a lot of southbridge sales with intel the primary chipset maker for intel. where amd switching over meant via/nvidia lost chipset sales.
at a discount of course.