"'Cartouche' is actually a French word meaning 'gun cartridge'. When Napoleon's soldiers were in Egypt, they nicknamed this shape 'cartouche' because it reminded them of the shape of their gun cartridges, or bullets." [www.ancientegypt.co.uk]
"In Egyptian hieroglyphs, a cartouche is an oval with a horizontal line at one end, indicating that the text enclosed is a royal name, coming into use during the beginning of the Fourth Dynasty under Pharaoh Sneferu." [en.wikipedia.org]
THE GREAT PYRAMID CARTOUCHE
In 1828, Champollion, of Rosetta Stone fame, translated a cartouche on a royal ring found at Giza as Shufu or Sophis. Four years later, Col. Vyse claimed to have discovered an identical cartouche in the then, unexplored Campbell's Chamber in the Great Pyramid. "The Monumental History of Egypt." Osburn. 1854.
Other variations of the name contained in this cartouche are Shuphu, Shoouf, Khoof, Khoop, Khufu and Cheops. "The Literary Gazette." 1839.
Eratosthenes of Cyrene (276 BC-194 BC) reports that Suphis was the 15th monarch of Egypt and refers to him as Saophis Comastes and Sen Suphis. "The Worship of the Dead." Garnier. 1904
Unless compelling evidence is tabled, as Thanos5150 has correctly pointed out, the cartouche in Campbell's Chamber, which has been the subject of so much recent speculation, can have been devised no earlier than the reign of Sneferu. Before that time, the serekh was the official tableau for the royal insignia.
Therefore, if the disputed cartouche is a fake, then it can only move the pharaonic timeline back a single generation. Is this discrepancy, if valid, significant enough to warrant all the recent hullaballoo about its authenticity?
WHO WAS SUPHIS?
Osburn on p. 338 states that Suphis was co-regent with his brother, Noh Suphis, and that the name of Noh Suphis "repeatedly occurs on the stones which form the arches of the incline leading down to the inner chambers."
What happened to these inscriptions?
He also states that his successor, Suphis II (Khafre), was a cotemporay regent with Userkeraf whose throne was at Abydos. Further, he maintains that it would have been impossible for the three pyramids of Giza to have been constructed in the accepted timeframe.
Therefore, until a clear case for the Khufu paradigm can be presented, is it any wonder that these largely unproductive, extremely lengthy threads continue to evolve.
Having said that, mere speculation without supporting evidence is no better than inconsistent, controvertible evidence. If it is the goal of all members of this board to thoroughly examine the narrative thus far, then it behooves each participant to offer the best evidence possible for scrutiny, and accept that the jury is still out.
So, who was Khufu?