K8L will not "NEED TO" run at 3.5GHz to run the max HTT3 clocks.
http://photos1.blogger.com/blogger/7...743DvWIml8.jpg
If we consider the HKEPEC table as true, than:
The differently clocked HTT is because of energy efficiency, but not because the chip is unable to achieve the max HTT clock. The bandwidth of the cHT links is tunned to be enough not to bottleneck the interCPU communication, while it wastes minimum energy.
HTT clock is not dependend of the CPU clock. For example you can run a K8 CPU at 800MHz and HTT bus at 1GHz or run a K8 CPU at 3GHz and HTT bus at 200MHz.
These are not everyday overclocks on normal (water or air) cooling and are achieved by dry ice cooling, just to get a validation. These CPUs run only few minutes on such freqfencies and are needing extreme hardware, a lot of people working around to achieve those benchmarks. There are a lot of threads on this forum about such overclocking sessions and most of these records are achieved by members of XS. You should check out these threads.
I have overclocked more than 20 various 90nm K8 CPUs, most of them between 1.8GHz-2.2GHz. According to my expireince, the average stable overclock is 25%, but with increased voltage. The higher clocked were less OC-able than the lower clocked.
I think that K8L will perform like Core2 clock, for clock. I don't think that it can outperform on the IPC front. K8L is a 3 issue core, while Core2 is 4+1 issue. Both have same SSE performance, K8L will have a little stronger FPU, while Core2 has stronger ALU.
About the clock speed I think same as HKEPEC rumors are saying that the first K8L will not break 3GHz. So far their 65nm process offers less perfromance than the 90nm and the 90nm K8 CPUs are at their freqfency edge at 3GHz. Quadcore K8L has more more than twice transistors than K8 dualcore with 2x1MB L2 and 3GHz K8L CPUS in the same power envelope will have significantly lower yields than K8 dualcores.
There will be no native quadcore Core2 CPUs, but it is irrelevant. The "true vs glued" is pointless argument used by AMD die-hard fanboys. They usually are ignoring the facts and are unable to understand how well Core2 Quad scalles in perfromance while using the 1066MHz FSB.
IMO AMD will not catch up Intel's CPU perfromance in the next year. To be sucessfull AMD have to offer competitve prices for the same perfroming Intel platforms, considering the total cost of CPU, mainboard and RAM.