Great catch Nick! This is a huge step in the right direction for Intel... Hopefully with the introduction of the new architecture we can see Intel pick up a lot of the slack they've created for themselves in the last couple of years.
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Intel can easily reach 4GHz already, the only reason they didn't is because the performance boost wasn't significant and they wanted to focus on releasing their Dual Core proccys.
I think that if they did go to 4.0ghz with the current architecture they would find that a lot of the chips would get speed binned and therefore it wouldn't be a cost efficient line to run.
But its good news to hear that Intel are finally pulling their finger out - hopefully we can see some AMD killing processors from them soon.
If they manage that - and with Nvidia's SLI chipset, they'll be back in the runnings for serious gamers