MacBook buyers still fuming from Apple’s decision to sell expensive laptops with just 8GB of RAM wish they had what Lenovo’s new ThinkPad P1 has: The ability to offer fast and power efficient RAM that you can upgrade. Upgradeable RAM in PC laptops isn’t a new thing of course, but Lenovo’s new ThinkPad P1 (announced on April 23) appears to be the first to use Micron’s LPCAMM2. LPCAMM2 is built to solve the problem that’s vexed laptops for years now: RAM power consumption. Laptops using DDR5 SO-DIMM RAM modules typically consume a lot of space and power. LPDDR5X RAM or low-power DDR5 can save si…