Intel Pentium 4 2.0 GHz vs. Intel Pentium III 1.0 GHz (2001)
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Intel Pentium 4 660 - 3.60 Ghz - 2245 Points
AMD Athlon X2 6000+ - 3.00 Ghz - 2848 Points
Intel Core2 Duo E8400 - 3.00 Ghz - 3647 Points
AMD Phenom II X6 1075T - 3.00 Ghz - 3820 Points
AMD FX 8320E - 3.20 Ghz - 4056 Points
Intel Core i7 950 - 3.06 Ghz - 4353 Points
Intel Core i7 3930 - 3.20 Ghz - 6268 Points
Intel Core i7 5960X - 3.00 Ghz - 6950 Points
It's sad to see that AMD could compete in single core performance until Sandy Bridge (i7 3930) came along. Would be nice if Zen can at least get Sandy Bridge numbers paired with good efficiency so we get more competition in the x86 space again. Numbers taken from: http://cpuboss.com/cpus/Desktop-CPUs-best-Overall-Performanc...Well, an AMD FX 8320E sells for less than 110€, while the Intel Core i7 3930 sells for over 500€.
Sounds like AMD has a very competitive offering, both in terms of price and price/performance ratio.
Unfortunately as merb already mentioned the performance to power ratio is not really good for AMD, which I guess contributes quite a bit to AMDs lost marketshare in the server segment (plus it doesn't look good in reviews which is bad for AMDs mindshare, which already is far behind Intel and Nvidia). And until Mantle/Vulkan/DX12 the performance in quite a few games was noticable behind Intel because AMDs single core performance was not on par which was bad because DX11 is basically single threaded. [1]
Overall I guess AMDs biggest problem is the mindshare. Wheras Intel or Nvidia can allow themselves one or two not so great generations, AMD tanks as soon as they have problems. AMDs HD 5000 generation was out sooner than Nvidia, faster and more energy efficient, but it only helped them gain 5% marketshare (around 45% at the time). AMDs 7000 generation could compete with Nvidia, but used more energy and bang, Nvidia regained more than the 5% percent that they lost, and that continued with Maxwell (they now have ~75% marketshare even though AMDs cards can compete on performance). [2] The same with Intel, when AMD could compete, and even beat Intel in performance and efficency over many years, they gained not that much marketshare (in part because of Intels shady manipulation, but in part probably also because of mindshare). Intels Conroe could regain some of the marketshare Intel lost thanks to its Pentium 4 (which reduced AMDS ~48% to 35%). Then came Bulldozer, which was underwhelming outside of multithreaded tasks and late in part thanks to GloFos 32nm problems and now AMD has aroun 20% marketshare). In the server space it's even worse for AMD with less than 1% marketshare compared to 25% around 2006-2007.
[1] http://www.littletinyfrogs.com/article/460524/DirectX_11_vs_...
[2] http://cdn.wccftech.com/wp-content/uploads/2015/04/Nvidia-AM...
The Pentium 4 519K from 2004, part of the Prescott (90nm) family, would be a good comparison. I think it was the first CPU that was easily overclockable to 4GHz, or in extreme cases 6Ghz (with enough water cooling).
Sadly it's not on that site (or at least I can't find it on mobile).
This is all you need to know about PIII vs P4 http://emulators.com/pentium4.htm
(But granted, if it was a 2.0GHz P4 it was a Northwood one, not a Willamette, which was ok)
http://www.tomshardware.com/reviews/atom-d510-pentium-4-nett...
With the Core2 line Intel then moved into a completely different direction with higher efficiency and lower clock cycles. Core2 was considered to be a massive success compared to P4.
That said, I was pleasantly surprised by the performance of the puny Aspeed graphics card with kernel mode setting. There is minimal tearing and the frame rates are smooth. The P4 had used a GeForce 3.
Of course single-thread and without AVX etc.