Pentium M 745a - SL8QZ

[Shenandoah]

All,

I recently picked up an IBM T-40 with a 1.5Ghz processor for under $300. It's in excellent condition and I'm thinking of doing a couple of upgrades. It has a 40Gb 5400rpm drive, so I probably won't do anything with that right away.

I'm going to install a 1Gb stick of memory and possibly upgrade the processor. A friend has the above processor and says it's the same as the Pentium M 745 but it has the Execute Disable Bit. I did a search on Intel's site and didn't find any info on the processor. I did find a mention of it on one of the wiki sites saying it is an OEM processor. Anyone know or heard about the Pentium M 745a? Will it work in my T40? Thanks.

Shenandoah

[underclocker]

I had a problem with a 725A (1.6GHz Dothan) in a T40 (all T40, T41 and T42s use the same BIOS).

You can read much more here -> http://forum.thinkpads.com/viewtopic.php?t=32165

Maybe your friend will let you try it out or maybe another forum member can confirm whether it will or won't work.

Welcome to the forum and please report back.

[Yandar]

I have a 735a. I tried it in my T41p, it only runs at 600mhz. Cpu-z confirms that the 735a ia C stepping chip. It appears from other users that T40 and 41 need B stepping 400mhz bus chips. IBM/Lenovo should of fixed this long ago.

[aaa]

Anyone try NHC to manually enable things? I have one of these and I'm about to do the equivalent in linux.

[aaa]

Ok I did a quick edit of the linux speedstep driver and it works fine now . So theoretically NHC should work on windows. It was a 715a btw, SL89U.

[Harryc]

Ok I did a quick edit of the linux speedstep driver and it works fine now . So theoretically NHC should work on windows. It was a 715a btw, SL89U.

You must realize that someone is going to run into this problem again eventually. Can you list the procedure and what you edited?

[aaa]

from arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c

Code: Select all

#ifdef CONFIG_X86_SPEEDSTEP_CENTRINO_BUILTIN_DOTHAN
        /* Builtin tables for Dothan B0 CPUs */
        DOTHAN(&cpu_ids[CPU_DOTHAN_B0], 1100, "1.10"),
        DOTHAN(&cpu_ids[CPU_DOTHAN_B0], 1400, "1.40"),
        DOTHAN(&cpu_ids[CPU_DOTHAN_B0], 1500, "1.50"),
        
        DOTHAN(&cpu_ids[CPU_DOTHAN_C0], 1500, "1.50"),
        
        DOTHAN(&cpu_ids[CPU_DOTHAN_B0], 1600, "1.60"),
        DOTHAN(&cpu_ids[CPU_DOTHAN_B0], 1700, "1.70"),
        DOTHAN(&cpu_ids[CPU_DOTHAN_B0], 1800, "1.80"),
        DOTHAN(&cpu_ids[CPU_DOTHAN_B0], 2000, "2.00"),
#endif /* CONFIG_X86_SPEEDSTEP_CENTRINO_BUILTIN_DOTHAN */

The one in the middle there is what I added.

[Temetka]

And how is that working for you?

[aaa]

Been a day and it's working fine. I lowered the voltage from the 600/0.8v I was using with the old cpu to 600/0.7v. Didn't feel like lowering the other speeds as that involves a lot of testing and rebooting...

BTW, I noticed that the official Linux kernel does not have any builtin tables for the Sonoma C0. Apparently this was added in by Ubuntu. So the quote above only applies to the patched Ubuntu kernel.

Edit: Apparently it was the patched Ubuntu kernel patched again for PHC. So take the Ubuntu kernel source and apply the ubuntu-phc patch, then make the changes.

[Harryc]

Has anyone tried the Pentium M 745a - SL8QZ in a T40 or T41 running XP?

[Shenandoah]

Harryc,

Yes, I installed the SL8QZ in my T40 and it works fine. As far as I can tell it is the same as an Intel 745 but it has the execute disable bit (which the T40 doesn't use?). I've run Notebook hardware control and it identifies it as a 1,8Ghz processor.

Eric

[Harryc]

Harryc,

Yes, I installed the SL8QZ in my T40 and it works fine. As far as I can tell it is the same as an Intel 745 but it has the execute disable bit (which the T40 doesn't use?). I've run Notebook hardware control and it identifies it as a 1,8Ghz processor.

Eric

Eric, thanks for the information.