Question Lenovo Legion T7 and DDD4 challenge

Dec 24, 2020
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Greetings from Ireland folks, and happy holidays while I'm at it!

New to the forum, and the reason I'm here is because I'm facing a head scratcher that I hope someone can enlighten me on. Cut the long story short, I got myself the latest Lenovo Legion T7 purely for gaming - my previous self-build outlived its usage, and given the unavailability of GPU's and PSU's to regular customers the pre-built seemed like a really good deal. So far so good, it's running sweet.

At any rate, the desktop came with 16Gb 3200 Mhz by Lenovo and I was going to upgrade with 64Gb 3200 Mhz Hyper X, 4x16 modules, which I got a great deal on during Black Friday. From the olden days I knew I may need to adjust the timings and voltages in DOCP or XMP - what I did not realize is that Lenovo doesn't provide neither capability in BIOS. The challenge is that, having swapped the sticks, the memory is bottlenecked @ 2400Mhz rather than 3200 Mhz - looking at CPU-Z (see CPU-Z s/shots) it appears that two sticks in JEDEC #8 and JEDEC #9 are running 1200Mhz, while XMP-3200 and XMP-3002 are running at 1600 and 1501 Mhz respectively. The million dollar question: is there any way to bring up the JEDEC ones to 1600Mhz on the Lenovo? If not, I assume that my only option to run 64Gb 3200 Mhz is to go with 2x 32Gb sticks in the XMP slots? I'll appreciate your guidance / advice as I could use some clarity on this - thanks in advance for your time & consideration!
 
Dec 24, 2020
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Hey rgd1101, I added more s/shots from CPU-Z and Speccy here in myalbum. When I was looking at the tech specs before purchase all that was stated was there are 4x DIMM ports so I was happy with that, I wonder now if the two sticks in ports 1 and 2 are dodgy - might swap them with 3 and 4 tomorrow to see if the performance follows, unless there are any other ideas?

The data sheet in PDF is available here.
 
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Dec 24, 2020
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Ok, I replaced the Kingston with the original Lenovo ones and noticed that they support JEDEC up to level 15 / 1600 MHz, whereas Kingston stops at JEDEC #9 / 1200 MHz. Since I cannot enable XMP support (unless anyone has any workarounds?) it does sound like I need to find other modules that support JEDEC at 1600 MHz, or get some more sticks directly from Lenovo.

Thoughts, ideas?
 
Dec 24, 2020
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Yes sir, Z490 and no XMP which is a major disappointment.... This is just recently released model so I hope they'll patch BIOS, I'll get in touch with them.