What are the differences between a T20, T21 and T22 MB's

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Msmax · #1 Post by **Msmax** » Mon Jan 15, 2007 8:57 am

I have a notebook with a diferent mainboard number then the one on the label.

According the Lenovo site the machine is a T21, according the mainboard number it is a T20. So, I guess the mainboard has been changed.

I would like to know what the differences are between the mainboards of a T20, T21 and T22.

Is it possible to change the number in the mainboard to match the number on the label at the bottom?

Thanks, Msmax

djpharoah · #2 Post by **djpharoah** » Mon Jan 15, 2007 6:33 pm

Main difference would be ram speed. I think the T22 supported SD-133 while the other two supported SD-100. Also the T22 has a 16Mb savage where as the other two have an 8mb savage.

ambientscape · #3 Post by **ambientscape** » Mon Jan 15, 2007 6:56 pm

djpharoah wrote:Main difference would be ram speed. I think the T22 supported SD-133 while the other two supported SD-100. Also the T22 has a 16Mb savage where as the other two have an 8mb savage.

I would correct that T23 is the only one that support SD 133 and the others support SD 100. Besides that only T23 has a 16MB graphic processor. More info....can be found in the thinkpad tawbook : http://forum.thinkpads.com/viewtopic.php?t=1689

Msmax · #4 Post by **Msmax** » Tue Jan 16, 2007 4:11 pm

Thanks for your replies.

I tried to find a difference but did not succeed.
The only thing is that the latest T22 boards supported 1Ghz processors.

- all have PC100 bus
- all have 8Mb Savage videochip
- same I/O connections
- etc...

I wonder why IBM has so many different FRU numbers for the same part!?

Any idea houw to change the xxxx-yyy number in the Bios to match the one on the bottom?

Regards, Msmax

losmeme · #5 Post by **losmeme** » Tue Jan 16, 2007 7:49 pm

Msmax

google: "Hardware Maintenance Disk v1.74"

I think this is the disk you need to change the serial numbers/model numbers in the BIOs to match whats on the body.

This disk was never publically available from IBM, but has found itself out in the wild.

babyman1737 · #6 Post by **babyman1737** » Tue Jan 16, 2007 8:40 pm

I don't to offend anyone, but most of these posts offer incorrect information, so I'll try to provide the most good answers I have:
T23 supports the PC133 ram chips, and has a 16mb videochip
T20 does not support SXGA+, T21-T22 motherboards do
T20-T22 supports up to 1GHz processors (T20 & T21 require CPU upgrade)
T23 supports up to a 1.2GHz processor
T20-T22 can hold up to 512mb of RAM, T23 can hold 1gb
that's all I've got for now, I'll try to think a little bit more. I know you didn't ask about the T23, but just wanted to clear up a few previous posts. Good luck.

ambientscape · #7 Post by **ambientscape** » Wed Jan 17, 2007 1:56 am

Just refer to the link I've posted above......it will show whatever information of all thinkpads.

Msmax · #8 Post by **Msmax** » Wed Jan 17, 2007 4:18 pm

Thank you for the very usefull replies.

I will try to find the maintenance disk and post here the results.

Msmax

What are the differences between a T20, T21 and T22 MB's

What are the differences between a T20, T21 and T22 MB's

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