1. Sandy Bridge to Skylake combined makes barely a double digit gain in IPC, ~roughly 14%. I hardly called that a "huge advancements" in IPC over 7 years time.
2. We have already proved should the SandyBridge Overclocked to 4GHz+ it would have perform faster in some cases than Skylake Uarch with same Clock Speed. Remember SandyBridge was 32nm.
3. "Netburst, Willamette, Northwood, Prescott, and Tejas " You made it sounds as if there were many generation. All of them are part of Netburst uArch and Willamette was the first Gen, Tejas was cancelled. So there is only "Willamette, Northwood, Prescott". Each with much improved Clock speed, better implementation of HT, better memory controller and cache read improvement, and finally AMD64, all translate to substantial performance improvement, regardless of its power usage.
Netburst may not be a good uArch, but it definitely brings many improvement, the writing was on the wall in 2004 and we got Core 2 in 2006. And we have been stuck with Quad Core Desktop CPU despite we have had over 4x transistor density improvement.
2. We have already proved should the SandyBridge Overclocked to 4GHz+ it would have perform faster in some cases than Skylake Uarch with same Clock Speed. Remember SandyBridge was 32nm.
3. "Netburst, Willamette, Northwood, Prescott, and Tejas " You made it sounds as if there were many generation. All of them are part of Netburst uArch and Willamette was the first Gen, Tejas was cancelled. So there is only "Willamette, Northwood, Prescott". Each with much improved Clock speed, better implementation of HT, better memory controller and cache read improvement, and finally AMD64, all translate to substantial performance improvement, regardless of its power usage.
Netburst may not be a good uArch, but it definitely brings many improvement, the writing was on the wall in 2004 and we got Core 2 in 2006. And we have been stuck with Quad Core Desktop CPU despite we have had over 4x transistor density improvement.