pMax
Regular
It was the above and some really bad bandwidth issues with reads and writes from the separate pools of memory.
If the PS3 had a unified pool of XDR then the ESRAM benefit from the 360 would have practically been negated.
Actually, I beg to differ: PS3 has nice memory - problem is, you had to program the DMA to feed the 8 (which was not 8 any way in PS3) SPUs, so you had to program each 256k chunk transfer in advance, paying attention to not overwrite in-working data, to not stall them etc...
Cell major weakness imho was that, tied to a useless in-order, dual issue PPC PPU.