see what I mean about suspect research? this, from https://specspro.net/laptops/809-toshiba-satellite-c55-b5242x/
Intel Pentium N3540 / 2.16 GHz
2.66 GHz
Quad-Core
2 MB
Yes
Intel Pentium 2.16 GHz
Intel HD Graphics
It's rare, in my research, when a line of laptops all have one and only one CPU they ever used.
Also in those specs it alludes to a single slot.
I go on..
I found the Toshiba factory manual:
"Model Name: C55-A5242
Processor and Graphics:
Intel Celeron Processor 1037U
(2M Cache, 1.80GHz)
Mobile Intel NM70 Express Chipset
Mobile Intel HD graphics with shared graphics memory
Memory
Configured with 4GB DDR3 1333MHz (max 16GB)
2 main memory slots. One slot is occupied
Storage Drive6
500GB (5400 RPM) Serial ATA hard disk drive"
at 1.8Ghz I'm not getting my hopes up. Will see if the 5296 is more robust. specspro was mostly right. NOTE: 2 memory slots though (EDIT).