Is this ram compatible with imac (21.5-inch, late 2015) that already has 8 gb 1867 mhz ddr3 ram?

Hello! This memory would only be for the 27" Late 2015 iMac. The 21.5" Late 2015 does not have upgradeable memory.

Hello which should I buy for a 2009 20 inch IMac??

Hello. The following memory in the link below would be the compatible memory for a 2009 20" iMac. https://www.amazon.com/OWC-204-pin-Upgrade-MacBook-OWC8566DDR3S8GP/dp/B00BKVQFU2/ref=sr_1_3?crid=PO0WVFXYZTU5&keywords=OWC8566DDR3S8GP&qid=1648742589&sprefix=owc8566ddr3s8gp%2Caps%2C69&sr=8-3&th=1

Can my imac late 2015 27" 5k model use 2x16gb memory sticks? or do i need to get 4x8gb sticks?

I believe you can only use 4 sticks of 8GB for that model. You always have to use pairs of memory. I bought the 32 GB package to max out my iMac, but one of the slots on my computer would not accept an 8GB stick, so I had to put an original 4GB stick back in that slot and its paired mate. I still have two sticks of 8GB that work, but I can't use. I am willing to sell them.

Is this compatible with MacMini Late 2012”?

Hello. No this OWC memory 1866MHz is not compatible with a MacMini late 2012.

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🚀 Upgrade your iMac’s brainpower—because speed waits for no one!

BLAZING 1866 M HZ DDR 3 SPEED - Turbocharge your iMac’s multitasking and app responsiveness with lightning-fast memory.
ENERGY SMART 1 35 V OPERATION - Lower voltage means cooler performance and longer hardware lifespan—upgrade smarter, not harder.
PLUG PLAY MAC QUALIFIED MODULES - Tested to meet or exceed Apple specs, guaranteeing rock-solid stability and peace of mind.
LIFETIME WARRANTY EXPERT SUPPORT - Industry-leading protection with free tech help keeps your upgrade worry-free and future-proof.
OPTIMIZED FOR 2015 I MAC 27 RETINA 5 K - Seamless compatibility ensures a hassle-free upgrade tailored for your powerhouse machine.

This OWC 16GB (2x8GB) DDR3 1866MHz SO-DIMM memory kit is a Mac-qualified, low-voltage (1.35V) upgrade designed specifically for 2015 Late iMac 27" Retina 5K models. Featuring 204-pin modules with CL13 latency, it delivers a significant performance boost while maintaining full JEDEC and ROHS compliance. Backed by a limited lifetime warranty and free tech support, it’s the smart, reliable choice to extend your iMac’s lifespan and speed.

€ 46.71

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Voltage	1.35 Volts
Column Address Strobe Latency	13
Data Transfer Rate	1866 MHz
Number of Pins	204
Form Factor	204-Pin
Compatible Devices	Desktop
Special Features	Lightweight
RAM Memory Technology	DDR3 1866MHz
Memory Speed	933 MHz
RAM Size	16 GB

OWC 16GB (2 x 8GB) PC14900 DDR3 1866MHz SO-DIMMs Memory RAM Upgrade Compatible with 2015 (Late) iMac 27 w/Retina 5K Models and Compatible PCs (OWC1867DDR3S16P)

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