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R51e CPU upgrade

R, A, G and Z series specific matters only. NOT for AMD-Ryzen.
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lukee
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R51e CPU upgrade

#1 Post by lukee » Tue Aug 13, 2019 3:48 am

Hi guys,
recently, I have acquired really nice, near mint R51e - no scratches, no shines on the keyboard etc. It runs pretty nice with Alpine Linux and I found it only has a Celeron CPU which of course lacks SpeedStep, has a half of L2 cache compared to the proper Pentium etc. Now I have the opportunity to get Pentium M 780 (2.26GHz - top of the Pentium M line) for almost free and I am curious if the R51e's standard cooler will be able to cool this CPU properly? According to ThinkWiki, R51e can accept Pentium M 780, but I'm not sure if the Celeron's heatsink cooler P/N is same for both CPUs? The CPU's TDP difference is 6 Watts (Celeron 21 Watts, Pentium M 27 Watts). Thanks.
Current: T420
Previous: T400, T43p Flexview, T40, R52, T43p 14"
My first ThinkPad was 570

axur-delmeria
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Location: Metro Manila, Philippines

Re: R51e CPU upgrade

#2 Post by axur-delmeria » Tue Aug 13, 2019 4:14 am

It'll be fine. It will run cooler than the Celeron M at idle and probably up to light CPU load, simply due to the fact that the Pentium M has SpeedStep and the Celeron M doesn't.

If it runs hot, just undervolt the CPU.
Daily driver: X220 4291-C91 i7-2620M

Backup: X601 Core 2 Duo T8100
Toy: X60F Core Solo U1300
On loan: X220 4291-P79 i5-2520M
In pieces: two retired but working X61Ts
RIP: 760XD 9546-U9E; X61 7676-A24; and a BOE-Hydis HV121P01-100 in failed SXGA+ mod
:cry:

lukee
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Re: R51e CPU upgrade

#3 Post by lukee » Tue Aug 13, 2019 7:15 am

Thanks, I'll give it a try. Just a side note: R51e, although being a 533MHz FSB Centrino ThinkPad, is not suffering from HDD error 2010 when using non-IBM's hard drive, is it?
Current: T420
Previous: T400, T43p Flexview, T40, R52, T43p 14"
My first ThinkPad was 570

dr_st
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Re: R51e CPU upgrade

#4 Post by dr_st » Tue Aug 13, 2019 8:28 am

lukee wrote:
Tue Aug 13, 2019 7:15 am
Just a side note: R51e, although being a 533MHz FSB Centrino ThinkPad, is not suffering from HDD error 2010 when using non-IBM's hard drive, is it?
I agree with you. That error was due to a SATA-PATA bridge that IBM used on its Intel ICH6-M laptops to connect an IDE(PATA) drive to a SATA port on the chipset (because ICH6-M only had one PATA channel which was used for the Ultrabay). Apparently, IBM could only verify it works 100% correct with specific drives and wanted to give a warning to the user when a different drive was used.

The R51e uses an ATI chipset (RC410MD with SB400 southbridge) which still has two IDE channels, so no need for bridge, and no need for whitelisting specific drives).
Thinkpad 25 (20K7), X1 Carbon (20HQ), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad, A21m 2628-GXU

lukee
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Re: R51e CPU upgrade

#5 Post by lukee » Fri Aug 16, 2019 2:23 am

Thanks dr_st, yes, I know about that design flaw in T43/R52/X41 series which are using Marvell SATA/ATA converter chip, but was not sure about R51e. Now it's clear for me, thanks.
I also plan to do a further upgrades of this nice ThinkPad (I really love the TrackPoint-only palmrest it has by the way :D), especially:

- Max the RAM out to 2GB
- Remove DVD-RAM unit it has and install an UltraBay HDD adapter to use it for a CompactFlash card which will serve as an SSD so I can implement following setup in my Linux filesystem: Main HDD will be used to store

Code: Select all

/home
,

Code: Select all

/var
and

Code: Select all

/tmp
directories while the CompactFlash card will be loaded with the rest of Linux standard directories. For me it seems promising that I will get improved system responsiveness, faster boot etc. when using the system from CF card, while the main HDD will be used for large data in my home folder and data which is changing frequently (logs, temps etc.).
- Eventually use my PCMCIA SD card reader as the "holder" for an SD card which will have a swap partition on it - this could add an additional performance gain, and although swap requires very frequent I/O operation, SD cards are cheap nowadays and I wouldn't be unhappy if the card fails every year or so...

So I think after above upgrades I will get a pretty decent setup with my R51e, and still pretty usable with my Alpine Linux distro on the classic, TrackPoint-only ThinkPad with greeaaat keyboard (I am missing these keyboards on the newer models) :lol:
Current: T420
Previous: T400, T43p Flexview, T40, R52, T43p 14"
My first ThinkPad was 570

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