




⚡ Upgrade your laptop’s brainpower—because speed waits for no one!
The Crucial CT4G4SFS6266 is a 4GB DDR4 2666MHz SODIMM laptop memory module designed for enhanced multitasking and faster app performance. Featuring a 260-pin form factor and low 1.2V voltage, it offers reliable, energy-efficient operation backed by Micron’s 42 years of memory expertise and compatibility assurance via Crucial’s system tools.







| ASIN | B07JMXN2W3 |
| Best Sellers Rank | 35,676 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 149 in Computer Memory |
| Brand Name | Crucial |
| Column Address Strobe Latency | CL19 |
| Compatible Devices | Laptop |
| Customer Reviews | 4.7 4.7 out of 5 stars (2,331) |
| Form Factor | SO-DIMM |
| Global Trade Identification Number | 00649528782366 |
| Item Weight | 0.01 Kilograms |
| Manufacturer | Crucial |
| Memory Speed | 2666 MHz |
| Model Name | CT4G4SFS6266 |
| Number of Pins | 260 |
| Product Features | Non Ecc |
| Product Warranty | Limited Lifetime Warranty |
| RAM Memory Technology | DDR4 |
| RAM Size | 4 GB |
| UPC | 649528782366 |
| Voltage | 1.5 Volts |
G**S
Good value upgrades
I bought these as memory upgrades for a couple of Acer Nitro 5 gaming laptops that I bought my twins. They replaced the 8 GB modules the laptops came with. Installation was simple, the laptop recognised them immediately and performance is greatly improved. I selected these 2666 MT/s over the default 3200 MT/s as they were cheaper and I was advised that the difference (in terms of game framerate) would be minimal (less than 10fps) which I felt they could live with.
A**A
Working perfectly
I bought these for my Imac and and was so easy to install and had no problems since. Absolutely amazing. Totally recommend
M**D
A massive performance boost for my latop
My MSI laptop originally had 8GB of RAM. This 32GB upgrade has really boosted it's performance. Relatively simple to install. Check out YouTube for guidance. A much cheaper fix than a new laptop.
M**I
Upgrade of Alienware m15 Dec 2018 model (R1)
When I ordered my m15 Dell's upgrade from 16GB to 32GB was an extortionate amount. So, like my previous laptops and computers I thought I'd leave it a while for Memory prices in general to naturally decrease. I had reason to open my m15 to replace the Seagate 1TB Hybrid HDD (or SHDD), which stopped being recognised by my m15 (long story). So, took this opportunity to replace the Memory too. The 32BG kit SODIMM modules fit my m15 without fuss, and they are registering on Windows task manager as 32GB 2667MhZ. All good so far. Shipping packaging: My order was sold direct from Amazon (not a market place seller). The packaging was diabolical. It arrived in a standard amazon cardboard sleeve A5 size, inside the sleeve was the thin plastic Crucial memory container. The cardboard sleeve showed signs of stress, i.e. other heavier items maybe stacked on top. Shameful Amazon! Given that other robust orders come wrapped in excessive bubble wrap! An this impact sensitive item came unprotected! You need to review your packaging allocation process.
A**R
Great upgrade
Laptop seemed to be struggling, and when I checked, almost all my memory was in use with Chrome. Went to Crucial site, and used their tool to scan my laptop and give me upgrade options. This was one, and their tool directed me to Amazon. Very helpful site by Crucial,and these fit the bill perfectly.
S**N
Good quick set up and install
Saviour for my old laptop that needed a little help
S**E
Thank Yoooooou!!!!!!
I was a little dubious after some of the reviews…. I have a 2019 iMac 27inch Retina Display….. However, I have to say they have worked perfectly!!! I’ve never dabbled or changed a computer I’ve owned before so I was bricking it! But it couldn’t have been easier!! I did have to do a bit of experimenting as they don’t work with the default Memory Cards, once I took those out my Mac was super quick. Statistics say it is running the full capacity and I couldn’t be happier after feeling disheartened by Apple prices (noob at 3D Rendering, you can imagine the previous frustration) Any, thank yooooooou!!!! One happy lady right here!!!!
A**K
Extra Ram
Extra RAM for my HP laptop, in my case was very easy and fast assembly, now my laptop has better performance.
C**O
Todo bien.
C**N
J'ai acheté le kit 2x16Go, et l'ai installé sur un Acer Nitro 5 AN517-51-52CK. Le composant est reconnus sans problème. La ram était le talon d'achille de mon pc: 8Go uniquement. En installant ce composant, la performance s'en ressent. Exemple, je n'ai plus de lag dans red dead redemption 2: avant: moyenne de 65 FPS, mais avec des minimums à 1FPS ou moins après: moyenne touours identique, mais le minimum monte à plus de 30 FPS, donc aucun lag ressentis en jouant. Cet achat va me permettre de conserver mon pc sans doute 1 ou 2 ans de plus.
R**I
Ho ricevuto la ram in tempi veloci e imballaggio integro. iMac acquistato a settembre 2020, 27 pollici medio di gamma modello 2020 processore decima generazione 3,3 GHz Intel Core i5 6 core. La ram perfetta, ma ho dovuto togliere i due moduli da 4 ognuno perché abbassava la velocità a circa 2100. Comunque piazzati i due banchi da 16 al posto dei due da 4 giga di fabbrica ed ho 32 a 2667. Perfetta se non per gli otto giga di Apple, ma 32 sono già tanto per me. Perfetta!
N**Y
من Amazon US ممتاز، اقل من اسبوع التوصيل. والحمدلله تم التركيب بشكل سليم واشتغلت
D**8
Recommended by a friend, this 4 Gb RAM chip fixed my computer's problem of slowness. So very glad to get it via Amazon. Thru' the Prime delivery, it arrived quickly. Photos will be posted later- but package was secure and the product top-notch. The Tech who installed the RAM remarked that I got a very good deal, too. Effortless installation and easy integration into my BIOS. Computer speed is zippy once more!
Trustpilot
2 weeks ago
2 weeks ago