Corsair Vengeance SODIMM 64GB (4x16GB) ddr4 2666 C18 Laptop Memory Kit, CMSX64GX4M4A2666C18

I only buy Corsair. But haven't had any issues with the memory I received.

Tested in many laptops and Mac, so far stability is excellent and passed memtest without any issues. Highly recommended for a fuss-free SODIMM non ECC DDR4 RAM.

標準装備のMSi GT75 Titan メモリー１６Gを６４Gに自力で入れ替え搭載しました。 更に,同時購入した,SSD1T（Samsung 860EVO2.5インチ）と標準のHHD1Tとを入れ替えました。 標準から見違えるぼど処理スピードが向上し，ハイスペックノートの機能を体感できました。

Ningún problema a la hora de instalar, mi iMac 27" 5K 2019 de inmediato reconoció las 4 memorias de 16GB que pedí.

Work as expected

Update on 22 Sep 20: As advised by JC in the QnA section, I contacted Amazon. And within 1 hour, received reply from Amazon on the replacement. And within 24 hours after the email from Amazon, I have received my replacement set... Unfortunately... again, 1 out of 4 stick is defective. Maybe you may question why I can confirm the 1 out of 4 is defective? The answer is because the 3 out of 4 are running good, in the same laptop (HP Probook 440 G7). Finally, Amazon give me 2 options: - full refund, or - partial refund for the defective piece of RAM. Raise the review from 3 star to 4 star because of the good support from Amazon. Speedy delivery. Install to my HP Probook 440 G7 (2 slots). There were some hiccup. Insert 2 out of 4 x16Gb into the 2 slots of my probook, but no sound no picture... really black screen at all. Named as RAM no. 46 and no.47 Insert another 2 RAM (named as no.41 and no.42). Still no sound no picture.. Insert back the original RAM. Boot in Win10 no problem. Troubleshoot 1: Slot 1: original RAM Slot 2: RAM no.41 It takes longer time, but it manage successfully boot in Win10. Run CPUZ to check and seems ok. Running at 1333mhz (or 2666mhz), CL18. Good RAM Troubleshoot 2,3,4: Slot 1: original RAM Slot 2: RAM no. 42, 46, 47 Found out that RAM 46 is defective. Troubleshoot 5: Slot 1: no.41 Slot 2: no.42 No picture, but this time got very loud Beep Beep Beep. Troubleshoot 6: (successful) Slot 1: no.42 (please note that i swab no.42 from slot 2 to slot 1 this time) Slot 2: no.41 (please note that i swab no.41 from slot 1 to slot 2 this time) Again, take a bit longer time, but finally manage to boot in Win10 successfully. Lastly, not sure how to contact Amazon related this issue? I don’t want to return the whole package as I bought them in really good price. Or should I contact Corsair? But still finding how to contact Corsair..