Questions about Kingston ValueRAM

On my side, this memory strip was never recognised by the system. It would seem that I have an accounting problem, although I had read the SPECs of the existing strip. In short, today, this laptop is gathering dust because I can't transform it into a simple movie player, I will have to use Linux to find a performing laptop

I can't judge that, I installed it in a Lenovo ThinkPad T420 (year 2011) and looked at the interface carefully beforehand to see if the memory bar would fit. The information about the interface should be in the Apple technical description.

Only DDR3 1066 MHz or DDR3 1333 MHz SODIMM is accepted as memory type for the Dell Vostro 3700. For example, the following product (if you already have 1x4GB installed): Kingston ValueRAM (1x, 4GB, DDR3-1333, SODIMM 204) Or the following product (if you need 2 memory modules): Kingston Value RAM (2x, 4GB, DDR3-1333, SODIMM 204)

Probably yes, but I always use the model-specific bars according to the Kingston website. In this case, their name starts with "KTA-MB1600", they are also in stock at Digitec and only slightly more expensive. The bars should be used in pairs (up to 4x 8 GB maximum), the 27" iMac has 4 total slots.

According to my information, you need DDR3 RAM with 1066MHz. For example, the following product: Corsair Mac Memory CMSA4GX3M1A1066C7 (1x, 4GB, DDR3-RAM, unbuffered)