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T25 can take ANY T470 motherboard and 64GB RAM
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T25 can take ANY T470 motherboard and 64GB RAM
Just found this on Reddit: I made a pretty cool discovery regarding the T25 (Anniversary Edition) and the T470! (sort of long)
Lovely day for a Guinness! (The Real Black Stuff)
Lenovo: X240, X250, T440p, T480, M900 Tiny.
PS: the old Boardroom website is still available on the Wayback Machine.
Lenovo: X240, X250, T440p, T480, M900 Tiny.
PS: the old Boardroom website is still available on the Wayback Machine.
Re: T25 can take ANY T470 motherboard and 64GB RAM
I imagine it is the same fellow posting here under the name DaddyLongLegs, as I find it very hard to believe that two different people with this rare model can be so unlucky to have the motherboard die on them 4 times in 3 years... A lot of the story is also similar.
Anyways, we already knew that the T470 and TP25 BIOS is the same, and we knew that you can mix and match many parts including motherboards between TP25 and T470/T480 (else the T480 mods would not be possible). What I learn from this story is that the T470 motherboard is a drop-in, and the BIOS automatically detects the correct keyboard. This is something I was not sure about until I read this, as theoretically the logic that determines whether it is a 6-row or 7-row could have been in some embedded chip on the motherboard. Glad to know it is not the case (assuming I understood everything correctly).
Anyways, we already knew that the T470 and TP25 BIOS is the same, and we knew that you can mix and match many parts including motherboards between TP25 and T470/T480 (else the T480 mods would not be possible). What I learn from this story is that the T470 motherboard is a drop-in, and the BIOS automatically detects the correct keyboard. This is something I was not sure about until I read this, as theoretically the logic that determines whether it is a 6-row or 7-row could have been in some embedded chip on the motherboard. Glad to know it is not the case (assuming I understood everything correctly).
Thinkpad 25 (20K7), T490 (20N3), 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
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad
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Re: T25 can take ANY T470 motherboard and 64GB RAM
Nice that the T470 and other 2-RAM slot 7th gens can use 64 GB RAM.
6th gen like T460 can also do 64 GB.
But the 4-RAM slot models like P50, P70, P51, P71 are still limited to 64 GB RAM. Even if you use 32 GB sticks to physically install >64 GB RAM, the BIOS will only report 64 GB, and the OS may acknowledge the increased RAM but reports only 64 GB usable. Oh well.
https://forums.lenovo.com/t5/ThinkPad-P ... -p/4390604
https://old.reddit.com/r/thinkpad/comme ... _possible/
6th gen like T460 can also do 64 GB.
But the 4-RAM slot models like P50, P70, P51, P71 are still limited to 64 GB RAM. Even if you use 32 GB sticks to physically install >64 GB RAM, the BIOS will only report 64 GB, and the OS may acknowledge the increased RAM but reports only 64 GB usable. Oh well.
https://forums.lenovo.com/t5/ThinkPad-P ... -p/4390604
https://old.reddit.com/r/thinkpad/comme ... _possible/
Re: T25 can take ANY T470 motherboard and 64GB RAM
It's easy to read the EEPROM, do some math and come up with the amount of memory installed. Having the ability to access different memory configurations is a different thing. Some memory controllers simply aren't wired flexibly enough (probably for energy saving reasons) so they "inexplicably" can't handle memory profiles that are possible, but were unavailable at the time of design. The Montevina series is a good example, as you can't install 8GB unless you use 8 chips per side 4GB DIMMs (4GB with 4 chips per side do not work). Which is a shame because (usually) the less amount of chips, the more advanced the lithography process.TPFanatic wrote: ↑Fri Jan 14, 2022 7:51 amBut the 4-RAM slot models like P50, P70, P51, P71 are still limited to 64 GB RAM. Even if you use 32 GB sticks to physically install >64 GB RAM, the BIOS will only report 64 GB, and the OS may acknowledge the increased RAM but reports only 64 GB usable. Oh well.
Despite all other improvements, memory is still a parallel interface. And parallel interfaces are notorious for having difficulties adapting to different profiles. That's why they were experimenting with serial memory years ago, but it didn't caught on. I'm sure they are going to try again at some point.
PCI Express is a good example of how serial interfaces tend to replace parallel ones. And on top of that we're going to see hardware level networking (packet model).
X301: SU9600 | 8GB | 1TB | WXGA+
X1C5: 7600U | 16GB | 1TB | FHD
X1C9: 1145G7 | 16GB | 1TB | WUXGA | WWAN
X1Y8: 1365U | 32GB | 1TB | WUXGA
P14s G1 AMD: 4750U | 32GB | 1TB | PG FHD Touch
T14 G2: 1145G7 | 32GB | 1TB | FHD
X1C5: 7600U | 16GB | 1TB | FHD
X1C9: 1145G7 | 16GB | 1TB | WUXGA | WWAN
X1Y8: 1365U | 32GB | 1TB | WUXGA
P14s G1 AMD: 4750U | 32GB | 1TB | PG FHD Touch
T14 G2: 1145G7 | 32GB | 1TB | FHD
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