Why do you insist they knew despite written statements from a former Xbox manager saying the opposite. It was clear they knew when Sony announced it and not earlier, like he said. Do you really claim to have more insight in this than he does?
Not "knew" as in they were absolutely certain, but...they very likely heard rumblings of Sony's 8GB plans prior to the official announcement, or at least were able to deduce the possibility they could've gone with 8GB since something like an increase in memory production is industry-wide news. These guys can draw inferences and conclusions based on events like that and news coming about.
Like I said, upper-level people at these companies have fairly good ideas where competitors are going regarding tech developments and plans. Many of them source components from the same companies, share certain supply chains and distribution channels, and are outright friendly with one another. If MS wasn't absolutely sure of Sony going with 8GB GDDR5 before the official announcement, they at least had enough to make an educated guess internally they most likely could've gone with 8GB GDDR5. That's all I'm trying to say.
Yeah but it was still tested in June/July. And even then AMD shouldn't be still testing in June/July after the devkits had already been distributed by Sony.
None of it make sense.
Hopefully that can convince you a bit where I'm coming from on this, then. Why keep testing Oberon in June/July 2019 at 2Ghz? Why even need to push a GPU to that level? It's not like Oberon is a Big Navi chip, anyway, so they wouldn't be getting bragging rights for leading specs regardless how high they could clock it.
There were some reports on successful overclocking of a 5700XT card a couple weeks ago; I don't see the correlation here but maybe Oberon was being used as a test sample towards
that? I mean if it's an abandoned PS5 chip, might as well repurpose it towards some other purpose "on the side", even if the data for it in the database doesn't quite reflect its new purpose.
But personally, kind of feels like a stretch imo, and not something a professional company would do (leaving listing data for a chip for a completely different project even if it's now being testing for a wholly different purpose).