I wanted to come back to this after reading Anandtech's review of the SGS2.
The 4460 does NOT have the SGX544. It is just a higher bin of the 4430 with the SGX540.
The 4470 has the SGX544, which is most definitely NOT a slightly improved version of the 540. The SGX544 is the 45nm version of the 65nm SGX543 in the iPad2.. it's at least twice as fast as the SGX540 and the only thing even in the same ballpark as the Mali400 in the SGS2.
AnandTech - Samsung Galaxy S 2 (International) Review - The Best, Redefined
AnandTech - Samsung Galaxy S 2 (International) Review - The Best, Redefined
If the Prime is OMAP-based, as is believed so far.. I think it HAS to be OMAP4470.
The only other SoC options are:
* Exynos -- Mali400 an excellent GPU, disappointing that LTE remains discrete
* OMAP4460/4430 -- SGX540 is a regression re: the competition (Adreno 220, Mali400), discrete LTE integration would be the same specs as Bionic
* Qualcomm Krait -- an interesting possibility with an 28nm SoC integrated LTE baseband and an excellent Adreno 225 GPU
Some food for thought there.. Krait is the only one that can deliver good performance on an HD screen AND low LTE power usage..