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The Future of Intel Processors
madison writes to mention coverage at ZDNet on the future of Intel technology. Multicore chips are their focus for the future, and researchers at the company are working on methods to adapt them for specific uses. The article cites an example were the majority of the cores are x86, with some accelerators and embedded graphics cores added on for added functionality. "Intel is also tinkering with ways to let multicore chips share caches, pools of memory embedded in processors for rapid data access. Cores on many dual- and quad-core chips on the market today share caches, but it's a somewhat manageable problem. "When you get to eight and 16 cores, it can get pretty complicated," Bautista said. The technology would prioritize operations. Early indications show that improved cache management could improve overall chip performance by 10 percent to 20 percent, according to Intel." madison also writes, "In another development news Intel has updated its Itanium roadmap to include a new chip dubbed 'Kittson' to follow the release of Poulson. That chip will be based on a new microarchitecture that provides higher levels of parallelism."
Penryn (a die shrink of the Core2 Duo/Quad plus some SSE4) should have 3 GHz+ models. The real performance issue isn't clockspeed, it's instructions per second. When you make 128-bit SSE take fewer cycles, and you add execution units, improve scheduling logic, and reduce access latencies (through pre-fetching or larger caches, or faster buses), you make processors faster. A processor that runs at 2 GHz with 3 Instructions per clock is just as fast as one that runs at 4 GHz with 1.5 IPC. The reason clockspeed hasn't been increasing is because performance gains have been coming from other areas. Intel could probably sell a juiced-up 3.6 GHz Core 2 Extreme, but it'd run at 180 Watts or something, and cost like $1500.
Sure, for most of the past 25 years, it has been the clock speed that's been improving. But that's changed in recent years. When Intel switched from Prescott to Core, they pretty much cut the clock speed in half without really sacrificing performance. That's because they increased the IPC a lot in Core, so that it had comparable IPS.
When comparing different processors with the same ISA (ie x86), IPS is the best measure of CPU performance, not clock speed.