07-10-2019 03:05 PM
Thank you, Spidey, for your welcome and your response! You have been most helpful.
I'm not sure if you know the answer, but would it be possible for the Y540 to support XMP if they update the BIOS, or is it a hardware issue?
Thank you in advance!
07-11-2019 06:29 AM
It is a BIOS limitation.
It may be possible through BIOS modding which is not recommended due to risk of bricking the board. Other enthusiast do dare but personally if the difference in performance is not significant then it would be better just getting a faster supported ram.
07-17-2019 01:02 AM - edited 07-17-2019 09:22 PM
Thank you again for your prompt response.
I have no intention of messing with BIOS modding, since I'm not comfortable tinkering with things I don't fully and confidently understand. I was thinking that if it's a software limitation (instead of a motherboard limitation), then there's hope that a BIOS update might be released by Lenovo that includes XMP 2.0 support.
After all, the 9th Gen i7 processor that is optionally sold with the Legion Y540 does support XMP 2.0. (I did not check the i5 model, since I'm not interested in it.)
Also, the Legion Y540 is advertised as running "Up to 32 GB DDR4 2666 MHz," which is only true if XMP is available, supported, and active. Otherwise, the memory speed is limited to only about 2133-2400 MHz (depending on manufacturer, series, etc.).
Anyways, thanks again for your response!
07-23-2019 12:36 AM
I've been reading up on XMP. Based on what I've read, memory (eg. SODIMM) is labelled according to their maximum stable overclocked speed. Thus, when overclocking your memory, the 2666 MHz SODIMM is designed to remain stable at 2666 MHz maximum. Higher speeds become unstable and could damage the hardware (eg. memory, motherboard, etc.).
The catch is that overclocking your memory is only possible if ...
1) your memory supports XMP, and
2) your Intel processor supports XMP, and
3) your motherboard supports XMP, and
4) your BIOS supports XMP, and
5) you have XMP activated (hardware and software).
In the case of the Legion Y540 laptop, ...
1) it is presently unknown whether or not the factory installed memory supports XMP.
If the memory supports XMP, then 2666 MHz SODIMM will have the potential to reach overclocked speeds of 2666 MHz. If the memory does not support XMP, then it will only reach the JEDEC industry standard speeds of around 1333 MHz and may even be labelled as such.
2) the Intel i5 and i7 processors both support XMP.
Some sources note that 8th and 9th generation Intel Core i5 and i7 processors support XMP.
3) it is presently unknown whether or not the Y540 motherboard supports XMP.
If we can find out the motherboard's manufacturer and model, then we might be able to determine whether or not it supports XMP. Lenovo is not known to produce their own motherboards, or if they do, then they are not known to produce motherboards with XMP support.
4) it is presently unknown whether or not the Y540 BIOS supports XMP.
Although Spidey101 provided a screenshot of his BIOS, I recently noticed that it states that he owns a Legion Y530 with Intel Core i7-8750H processor (8th generation i7).
According to Lenovo and other critics, the Legion Y540 features a 9th generation Intel Core processor and other improvements not available on the previous Y530 model. (In fact, rumour has it that next year's model will have even more improvements over this year's model ... many of these improvements sound very cool, but I need a new laptop ASAP to replace my present 3rd generation i7 for certain tasks, like video editing.)
5) it is presently unknown whether or not the Y540 has XMP activated or deactivated or can be toggled.
If the Y540 has XMP support on its memory, motherboard, and BIOS, then there's no reason why the Y540 cannot and should not have XMP activated by default or have the option to toggle between JEDEC (XMP deactivated) and XMP (activated) in its BIOS. Even if the memory does not have XMP support, then the Y540 should still have XMP support for replacement memory that has XMP.
That being said, based on what I've read, if you have a system that allegedly supports 2666 MHz memory, then you should buy/use 2666 MHz memory. Even if it only uses the JEDEC industry standard of about half that speed (begins at about 1333 MHz), it's still faster than using slower memory which will be about half of its listed speed.
Alternatively (based on what I've read), buying/using memory that is faster than 2666 MHz in order to reach a JEDEC industry standard speed of somewhere between 1333 MHz and 2666 MHz will not work (for unexplained reasons).
The only alternative that allegedly does work is to invest in 2666 MHz memory that begins at timings faster than the JEDEC industry standard (eg. begins at 2400 MHz, but can reach up to 2666 MHz with XMP). However, critics warn readers to only invest in products by reputable manufacturers/brands (eg. Corsair, Crucial, Ballistix, Samsung, etc.) and that have relatively excellent reviews from various sites/sources/critics.
I hope you (and others) find this helpful. Take care!
07-23-2019 01:00 AM - edited 07-23-2019 01:02 AM
If (and only if) the Legion Y540 runs at its advertised speed of 2666 MHz, then that would be excellent.
If, however, it only runs at the JEDEC industry standard of about 1333 MHz, then Lenovo should change their advertising to clearly state that it uses 2666 MHz SODIMM at about 1333 MHz (no XMP support).
One way to find out the memory's speed is to use a program called CPU-Z (or similar), which provides the relevant information under the SPD tab.
I hope this helps!
07-25-2019 01:43 PM - edited 07-25-2019 01:44 PM
I have received my Lenovo laptop. For anyone who is wondering about the specs on the Legion Y540-15IRH, here they are (more or less) for the 8 GB 2666Mhz DDR4 SODIMM system.
As you might notice, the SODIMM is made by Samsung (excellent!) and are 2666Mhz DDR4 SODIMM, but the system comes set to the JEDEC industry standard (1333MHz) instead of overclocking them up to 2666MHz (XMP).
Using the Lenovo Vantage software, we read that there might be an option for overclocking the CPU and memory and boost the network. This would allow the system to run faster and the SODIMM to run at the advertised speed of 2666Mhz.
The question is, If this gaming laptop has these features, then where are they?