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I recently purchased a Lenovo Legion Tower 7i Gen 8 with Intel Core i9-14900KF processor and GTX 4080 Super. Specifically, this is the Legion T7 34IRZ8 with an Intel Z790 motherboard chipset.

I found mixed reviews on the RAM capacity; the datasheet specified 64gb max, but other information indicated 128gb max. I am happy to report that I am running 128gb; 4x 32gb sticks.

My full saga:

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My machine shipped with 32gb of ram, 2x 16gb SK Hynix sticks.
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I updated the BIOS to the May 7th release, BIOS Version O5UKT3AA
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Using this BIOS version, I could enable XMP profiles and set the factory RAM to DDR5-5600
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I took the risk of ordering a 128gb ram kit. Specifically, I went for the Kingston Fury Beast Black 128gb (4 x 32gb) kit, Kingston P/N: KF556C40BBK4-128. This can be found here at present: www.amazon.com/.../B0C3487K2B
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I first replaced the stock ram with half the new ram (2 x 32gb). This booted fine, and on XMP Profile 1 would run at 5600 MHz
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I then added two more 32gb sticks, filling up the RAM channels. It took a long time to boot with this configuration; I believe the BIOS eventually resorted to default configuration and a memory speed of 3800 MHz.
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Once into the BIOS, I tried setting the XMP Profile 1, all sticks to 5600 MHz. No luck getting this to post.
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Fortunately I could get into the BIOS and switch the profile to XMP Profile 2, DDR5-5200. Ran several memory tests (OCCT, Karhu TestMem5) and all is stable.

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Upgrading Legion Tower Ram