It's a 43% clockspeed increase over the fastest CSPPC ever sold by phase5 (233MHz) and a 66% increase over the much more common 200MHz version. Hardly insignificant.
Actually, my other statement was a bit rash.
With the X86 platform I didn't get that much performance boost with parts from above 200Mhz to 400Mhz.
But I bought a 450Mhz K6-III and was quite surprised. I spent a lot of time installing/recommending the cache on processor K6s (K6-III, K6-III+, and K6-2+) to friends and business associates.
The re-assignment of the 2X multiplier to 6X was great for both overclocking and for use in older machines that didn't have a 100Mhz FSB or higher multipliers.
As many came back to me, I had a lot of K6+ sales on Ebay. Almost all shipped to Germany (obviously the land of fanatics who must see how far things can be pushed). Also understandable as AMD had a Fab at Dresden (now owned by Global Foundries).
Due to my obsession with the last Socket7 processors , I was late in moving to later CPU architectures. However, when I bought my first SocketA processor (a low end 600Mhz Duron) I stunned.
At 600Mhz the Duron way outperformed the K6-III/2+ (and it could overclock to as high as 800Mhz).
So the change in design outweighed the pursuit of higher clock speeds.
It was a useful lesson when the P4 was introduced. I dismissed that line from its introduction and eventually gain my vindication.
With a successor to the CSPPC, we need something like what you were looking forward to (the G4) or at least say a 550Mhz 440 core.
And any compatibility will have to be software only. I don't need Thomas Dillert's sore feelings dragged into this.
Take care Karlos.
Jim