Yes, it should work, I have installed this RAM in a MacBook Pro. According to Apple's specifications, it also fits the iMac specified: https://support.apple.com/de-ch/HT4255

I think so, it says so in the specs and the chips are running 1a Greetings jp

Which CPU has? I5 or i7 CPU OK (i5 or i7 CPU) works fine. 1333Mhz DDR3 PC10600

In theory it should be compatible. The early 2011 MacBook Pro 13 has two SODIMM slots and supports up to 8GB of RAM at 1333 MHz. However i think Corsair also sells certified Mac memory if you want to go for that.

Yes they are, but I'd advise you to go for the Corsair mac memory models. :D

I think they should fit according to the technical description of your device... http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c02218723

As written in the specifications, this is possible with a 64-bit system (please check!), but the 4GB modules are not certified. However, the module is listed by Corsair in the Memory Finder for your PC and all other specifications are compatible with each other. So, theoretically yes.

I'm afraid I don't know.

According to the manufacturer's specifications (http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c02798336), these RAM bars would fit. However, since a 4GB bar is already installed, it is not worth buying 2x 4GB. I would recommend the following product: Corsair ValueSelect (1x, 4GB, DDR3-1333, SODIMM 204) Otherwise, you do nothing other than remove a bar in order to install an equivalent one... PS: With this device, however, you should consider whether only a RAM update will really bring the desired result or whether you would rather buy a new device. This device already has a few years under its belt.

Yes, that fits. However, the installation of an SSD will bring more speed than the ram expansion.

Unfortunately, the RAMs are not listed in the official compatibility list of your PC. In this respect, we are unfortunately unable to confirm compatibility.

Unfortunately, the memories listed above are not suitable for this model. However, we can recommend the following memories for the iMac 27 2011: https://www.digitec.ch/de/Comparison/286996-3456773