04-10-2019 09:00 AM
I have a Lenovo Thinkcentre M93p Pro SFF model 10A90013FR, which originally had an i5-4570.
For a CPU upgrade I bought an i7-4790, but my computer doesn't boot when I put it inside.
I know my i7 CPU is working because it works well on another Dell PC I have.
I upgraded the BIOS with the .exe file available on the Lenovo Support page.
I did a reset of the CMOS by removing the jumper and coin battery, but still it doesn't boot with the new i7.
Some stuff I found on Lenovo forums :
This thread explains that the i7 **** K CPUs aren't supported by Lenovo motherboard. Its OK since my CPU isn't a K model.
On this thread the guy wants to do the same CPU upgrade than me, but it doesn't work either... I don't know if the last advice given is working for him.
A simple question, do any model of M93p Pro SFF can support an i7-4790 CPU ?
Because my booting problem and this list makes me think that the different models of M93p SFF are only compatible with the original CPU they were sold with, which means the only CPU I could ever have on this machine is the i5-4570.
BONUS QUESTION :
The Detailed specifications for ThinkCentre M93, M93p (SFF) page is relevant for 10A8 and 10A9 models, but the supported processor list doesn't show i7-4790 :
Haswell Core i5
Haswell Core i7
although some models like 10A90048US clearly support the i7-4790.
although this PDF shows the i7-4790 in the list of supported processors for M93p SFF Pro models.
Why is that ?
Thanks a lot for any help :-)
Solved! Go to Solution.
04-12-2019 03:48 AM
After a reply on another thread of someone who tried the same CPU upgrade than me, I can say the CPU upgrade to i7 on M93p SFF originally sold with i5 doesn't work, unless with some dark magic or whatever...
Upgraded the BIOS, reseted CMOS with jumper and coin battery, unplugged every unecessary drives...
Still doesn't boot.
After a quick search on Internet, SFF desktops from other computer brands originally sold with i5 CPUs can upgrade to i7. Maybe this problem is specific to Lenovo's motherboard (which doesn't respect the form standart, nor the pin connector to PSU standart).
04-12-2019 08:42 AM
It could be there was a revision of the motherboard so that the i7-4790 would work.
I also recall that before the "modern" Intel core processors, when upgrading a processor in a ThinkCentre, it had to have the same stepping (sometimes called revision) as the processors that Lenovo used for it to work. Then that problem went away, or at least it seemed to, as processors with different stepping went away. But perhaps compatibility extends beyond stepping to the actual "S-Spec" number, there were two for the i7-4790. Can you tell us what the S-Spec number is the lid of the processor?
04-12-2019 09:09 AM
Which is the production revision of that chip. And since two of you had the same problem, I can only speculate that there was a revision of the motherboard that enabled the i7-4790 to work.
04-12-2019 09:38 AM
And since two of you had the same problem, I can only speculate that there was a revision of the motherboard that enabled the i7-4790 to work.
04-12-2019 10:33 AM
04-12-2019 11:33 AM
I will have to buy another M93p SFF of a specific model (which motherboard has been revised in order to be compatible with the i7) ?
As you indicated in your original post, the i7-4770 was an option for your specific M93p model 10A9. While it's always desirable to go to the very best processor available when upgrading it. The actual difference between these two processors is very small, less than 5%.
"These improvements (~4%) are marginal and practically impossible to discern in day to day use. "
04-12-2019 12:09 PM