Thinkpads Forum

Posted: **Sun May 03, 2015 8:30 pm**

Can the T61p (in particular: 6457-7XX (15'' 1920x1200 screen, T7700 processor) use more than 4G of memory? Normally I would just get a pair of 4G sticks and try them, but they've gotten really expensive (supply and demand, I guess), and I'd rather not blow $200 that I won't be able to use anywhere else.

Thanks,

/ji

Posted: **Sun May 03, 2015 8:38 pm**

T61/p will accept up to 8GB (2x 4GB).

Posted: **Sun May 03, 2015 8:44 pm**

You can use PC2-5300 (667Mhz) or PC2-6400 (800Mhz), though the latter will just downclock to 667 Mhz. The only reason to get PC2-6400 would be for the quadcore mod, but that is in its own thread.

Posted: **Mon May 11, 2015 11:22 am**

brchan wrote:You can use PC2-5300 (667Mhz) or PC2-6400 (800Mhz), though the latter will just downclock to 667 Mhz. The only reason to get PC2-6400 would be for the quadcore mod, but that is in its own thread.

Yeah!

Code: Select all

$ head -1 /proc/meminfo 
MemTotal:        8109912 kB

$ dmidecode -t 6
# dmidecode 2.12
SMBIOS 2.4 present.

Handle 0x0008, DMI type 6, 12 bytes
Memory Module Information
        Socket Designation: DIMM Slot 1
        Bank Connections: 0 1
        Current Speed: 155 ns
        Type: DIMM SDRAM
        Installed Size: 4096 MB (Double-bank Connection)
        Enabled Size: 4096 MB (Double-bank Connection)
        Error Status: OK

Handle 0x0009, DMI type 6, 12 bytes
Memory Module Information
        Socket Designation: DIMM Slot 2
        Bank Connections: 2 3
        Current Speed: 155 ns
        Type: DIMM SDRAM
        Installed Size: 4096 MB (Double-bank Connection)
        Enabled Size: 4096 MB (Double-bank Connection)
        Error Status: OK

Posted: **Thu Sep 03, 2015 7:12 pm**

The T61P can hold 2 x 4 GB memory, but its no use to you if you have a 32 bit OS. 64 bit linux sees 8 GB with no problems.

Posted: **Fri Sep 04, 2015 10:28 am**

[quote="twillis449"]The T61P can hold 2 x 4 GB memory, but its no use to you if you have a 32 bit OS. 64 bit linux sees 8 GB with no problems.[/quote]

Your statement is incorrect. While no single process can use more than 4G of address space, the OS itself can. Look up PAE (Physical Address Extension).

In any case, in my last post I did show that I was successfully using all 8G, so what was the point of this message?

Posted: **Fri Sep 04, 2015 2:00 pm**

Since we are nitpicking: you did NOT show that your OS was USING 8GB, only that it SAW 8GB, a HUGE difference!
Regardless, to USE the full 8GB under Windows you do need a 64-bit OS. Don't know about Linux.

Posted: **Fri Sep 04, 2015 2:47 pm**

RealBlackStuff wrote: Regardless, to USE the full 8GB under Windows you do need a 64-bit OS. Don't know about Linux.

The same applies to Linux. Or OSX. Or whatever else...

Posted: **Fri Sep 04, 2015 5:51 pm**

[quote="RealBlackStuff"]Since we are nitpicking: you did NOT show that your OS was USING 8GB, only that it SAW 8GB, a HUGE difference!
Regardless, to USE the full 8GB under Windows you do need a 64-bit OS. Don't know about Linux.[/quote]

Learn: /proc/meminfo

Posted: **Fri Sep 11, 2015 2:59 pm**

8gb on T-61 also?
(yes I use 64 bit)

Posted: **Fri Sep 11, 2015 3:07 pm**

Yes, all T61/R61/X61 can use 2x4GB = 8GB PC2-5300 or PC2-6400 Sodimms.

Posted: **Sun Sep 13, 2015 10:45 am**

RealBlackStuff wrote:Since we are nitpicking: you did NOT show that your OS was USING 8GB, only that it SAW 8GB, a HUGE difference!
Regardless, to USE the full 8GB under Windows you do need a 64-bit OS. Don't know about Linux.

More nitpicking: this assumes a Windows client OS. There are 32-bit Windows Server versions that can use more than 4GB. Individual apps can even access more than 4GB if they are compiled for it (which most probably aren't).

Posted: **Sun Sep 13, 2015 10:54 am**

jdrou wrote:
RealBlackStuff wrote:Since we are nitpicking: you did NOT show that your OS was USING 8GB, only that it SAW 8GB, a HUGE difference!
Regardless, to USE the full 8GB under Windows you do need a 64-bit OS. Don't know about Linux.
More nitpicking: this assumes a Windows client OS. There are 32-bit Windows Server versions that can use more than 4GB.

Well, if one *really* wants to nitpick, pre-SP1 XP could use more than 4GB. And that's a client OS.

With that being said, how many people actually run server versions - or the original XP - on their *61-series ThinkPads?

Posted: **Mon Sep 14, 2015 12:46 pm**

ajkula66 wrote:Well, if one *really* wants to nitpick, pre-SP1 XP could use more than 4GB. And that's a client OS.

With that being said, how many people actually run server versions - or the original XP - on their *61-series ThinkPads?

Certainly few if any but if you have a Windows app that is able to use the memory, at least the option does exist. Of course you're better off with 64-bit version unless your app doesn't work with 64-bit or doesn't work with newer Windows versions.

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