PPC 7448-based Upgrade Cards Available... 2 Years Too Late

Already announced several months ago, the first upgrade cards based on the PPC 7448 are now available.
OWC offer 4 models from Newer powered by one or two 1.8 or 1.8 PPC 7448. Prices range from US$399 (mono 1.7GHz) to US$679 (Dual 1.8GHz).
One can only install such upgrade cards in PMG4 AGP; PMG4 MDD is excluded.
As a reminder, hereafter are specifications of the PPC 7448 (already announced in 2004!):
- 90 nm engraving
- optimized Altivec
- 1MB of L2 cache
- power saving management system allowing to decrease CPU frequency up to 4 fold.
Of course, such upgrade cards come simply too late to our point of view, as one can find a second hand PMG4 Dual CPU for about the same price, and even a Mac mini Core Duo will be faster.
In addition those upgrade cards re not available for the Cube, a computer considered by most Mac users as a "collector" and for which the high cost of an upgrading card could have been justified.