http://news.bbc.co.uk/2/hi/technology/6299147.stm

QuoteAt 45nm Intel should also be able to ramp up clock speed, so expect to see Penryn debut at over 3GHz easily. Given how overclockable Conroe turned out to be, we wouldn't be too surprised to see Penryn scale very well.And the last bit of Penryn information Intel is letting out today is that it demonstrated Penryn up and running actual applications at a press briefing in Santa Clara on January 25th. There were five Penryn systems configured and clocked as follows: 1) 45nm dual core mobile processor in a notebook with Microsoft Vista running Microsoft Office 2003 applications. 2) 45nm dual-core desktop processor running high definition video content (1080P) under Microsoft Vista. 2.13 GHz 3) 45nm quad-core desktop processor running Ubisoft Rainbow Six Las Vegas game under Microsoft Vista. 1.86 GHz 4) Two 45nm dual-core processors running Glaze Workstation application under Microsoft Windows 2000 Advanced Server. 2.13 GHz 5) Two 45nm quad-core processors encoding a video in Adobe Premier under Microsoft Vista. 2.13 GHzAll of the systems were air-cooled using normal heatsink/fan units. Unfortunately Intel wouldn't share any benchmarks or more details of the systems other than what software they were running.At this stage in the game it's normal to see clock speeds much lower than final shipping silicon, but this is the first time that Intel has been so forthcoming with clock speed data this far before launch. What we're seeing is a far more proud and confident Intel, and honestly it has every reason to be given the recent successes of Core 2 and promise of Penryn.http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=2915&p=3For Intel, we see continued strengthening and a roadmap that has a lot of promise. Penryn should be out sometime in the second half of this year, followed by a brand new architecture under the codename Nehalem. Nehalem will also be the first time we get to see an architecture change post-Core 2 under Intel's new tick-tock model of introducing new architectures every two years. It's quite possible that in the next two years Intel will have made the CPU industry far more exciting than it has been in the previous five (Core 2 launch withstanding).UnQuote.Manny

From Tomshardware:"Intel aims to maintain the current power envelopes (35 watt and lower on the notebook), so we can expect substantially higher clock speeds with Penryn. So, how much clock speed are we talking about? Intel declined to comment, but engineers familiar with the topic indicated that the data provided by Intel would mean more than 3.3 GHz" Given 80% overclocks are fairly easy on core 2 duos, with Penryn:3.3 + 80% = 6GHz Interesting....