quick question on max ram for T60P?

[SaberX]

Can the T60P with Core2Duo T7200(2.0Ghz) handle and use the full 4 gig's of ram?
My buddys wants me to upgrade his T60P (15.4" WSXGA+,T7200,100gig/7200,ect).
I'll be installing a match pair of DDR2 667Mhz 2 gig ram for 4 gig total.
Also be doing a clean install of Vista Bussness 64bit.

I'm 90% sure it can like to here from other T60P owners running 4gig's.

[dr_st]

T60's chipset limitation makes it possible to address only 3GB of RAM, regardless of OS.

It has been discussed extensively, and there is even a sticky thread in the T6x forum, I think.

[qviri]

The T60p uses a 945PM chipset. Intel's page for this chipset states "up to 10.7GB/s of bandwith and up to 4GB memory addressability"

There is a limitation, but it's not in the chipset itself. Where -- I do not know.

[SaberX]

Thanks for the info.
I should have knowen better then to post this question befor looking in the T60 forum.

My Dell i have uses the 945PM chipset and with 4 gig's of ram,Vista says it's 4gig's.The system "seems" to runs little better then with 3 gig's.
But in the Dell's bios it does show full 4 gig's installed BUT only 3.5 useable.This is with Vista 64bit.
I'm still looking up info on it.

[Johan]

... there's also a sticky in the T6x forum with detailed information about max. RAM in T6x's; see T60/T61/p memory limitations -- the definitive answer.

Johan

[Troels]

The T60p uses a 945PM chipset. Intel's page for this chipset states "up to 10.7GB/s of bandwith and up to 4GB memory addressability"

There is a limitation, but it's not in the chipset itself. Where -- I do not know.

It is in the chipset itself, or rather which registers is set to what to allow up to 4GB memory adressability.
See page 321, figure 10.
There's a total of 4 GB addressability space, but like any other chipset, it must be shared with the PCI mapped devices. The PCI / PCI Express mapping space is seen in figure 13, page 327.
As seen somewhere along of 1 GB can be used depending on the TOLUD register. While the GMA950 isn't used in the T60p for example, the adress ranges are still reserved for the PCI Express Bus, i.e. if you add a graphics card in the advanced dock

[qviri]

Troels, I didn't see that message earlier. Thanks.

I guess the T60 reserves a bit more addresses than the other notebooks for use of docked graphics, and hence the limit is at 3 GB rather than the 3.25-3.5 GB usually seen in other machines?

Is the chipset doing the addressing, and is this the cause for the 4 GB addressability limit even on 64 bit CPUs and operating systems?