Talk:RAM

Main System Memory

The PS3 has 256MB of 64 bit bus Rambus XDR main system memory. Some models use four 64MB Samsung chips, while other models uses four 64MB Elpida chips. Note that another 256MB of GDDR3 memory is located inside the RSX chip using four 64MB Samsung chips. The earlier models with hardware PS2 compatibility also contained an extra 32MB of RDRAM using two 16MB Samsung chips.

A sample of the Memory chips in different PS3 models:

Type	Size	Speed	Voltage	Packaging	Manufacturer	Serial Number	Description
Rambus XDR	64MB	400MHz			Elpida	EDX5116ACSE-3C-E	256MB total (4 chips) for PS3 System Memory (Initial Models)
Rambus XDR	64MB	400MHz			Samsung	K4Y50164UC-JCB3	256MB total (4 chips) for PS3 System Memory (Initial Models)
Rambus XDR	64MB	400MHz			Samsung	K4Y50164UE-JCB3	256MB total (4 chips) for PS3 System Memory (CECHG,CECHK)
Rambus XDR	64MB	400MHz			Elpida	X5116ADSE-3C-E	256MB total (4 chips) for PS3 System Memory (CECH-20xx)
Rambus XDR	128MB	400MHz			Elpida	X1032BASE-3C-F	256MB total (2 chips) for PS3 System Memory (CECH-21xx and later)

Graphics Memory

Type	Size	Speed	Voltage	Packaging	Manufacturer	Serial Number	Description
GDDR3	64MB	700MHz			Samsung	K4J52324QC-SC14	256MB total (4 chips) for PS3 Graphics Memory

PS2 Compatibility Memory

Type	Size	Speed	Voltage	Packaging	Manufacturer	Serial Number	Description
RDRAM	16MB	800MHz		54-pin	Samsung	K4R271669F	32MB total (2 chips) for Hardware PS2 Compatibility System Memory

source: http://www.edepot.com/playstation3.html#PS3_Motherboard

todo: add datasheet links, more package & pad/pin info, cleanup