Question Issues with new Corsair RAM


Oct 6, 2019
This might be one for tech support
2 days ago I bought Corsair Vengeance RGB Pro RAM DDR4 3200 MHz (2x8GB, product number CMW16GX4M2C3200C16) from the Corsair store on Amazon UK
Once it arrived I put it in my computer along with my current RAM (2 individual sticks of 8GB RAM and product number CM4X8GD3200C16W4). When it is in the computer, it will refuse to POST and some of the fans will refuse to spin unless the CMOS is reset. In addition to this, the RAM and the power indicator won't light up as if the system is not entirel;y getting the full power draw. I have tried:
- Putting the known good RAM into every slot (1,2,3 and 4) which works fine
-Putting the new RAM into slots (slots 2 and 4 in this case) and it refused to work
-Putting the new RAM into the remaining slots (slots 1 and 3 in this case) and it refused to work
-Testing each stick induvidually in different slots (the original 2 worked but the 2 new ones didn't)
-Mixing old RAM and new RAM in varying slots (computer refused to POST)
-Testing JUST the new RAM (no POST)
-Sending the RAM back and getting a replacement twin pack from Corsair Amazon UK (the new one still didn't work)
I'm assuming at this point that the twin 8 GB pack despite being Corsair DDR4 3200 MHz Vengeance Pro RGB RAM is not compatible with my motherboard, that said, is there a different SKU I could try?
I'm struggling to understand why essentially the same RAM refuses to work
What is the difference between (original) CM4X8GD3200C16W4
and new CMW16GX4M2C3200C16
My PC Specs are as follows:
Processor (CPU) Intel® Core™ i7 Eight Core Processor i7-10700KF (3.8GHz) 16MB Cache
Motherboard ASUS® ROG STRIX Z490-F GAMING (LGA1200, USB 3.2, CrossFireX/SLI) - ARGB Ready
Memory (RAM) 16GB Corsair VENGEANCE RGB PRO DDR4 3200MHz (2 x 8GB)
Graphics Card 6GB NVIDIA GEFORCE GTX 1660 SUPER - HDMI, DP - GeForce GTX VR Ready!
1st Storage Drive 2TB SEAGATE BARRACUDA SATA-III 3.5" HDD, 6GB/s, 7200RPM, 256MB CACHE
1st M.2 SSD Drive 1TB INTEL® 665p M.2 NVMe PCIe SSD (up to 2000MB/sR | 1925MB/sW)
Power Supply CORSAIR 550W CV SERIES™ CV-550 POWER SUPPLY Power Cable
Processor Cooling Corsair H100i RGB PLATINUM Hydro Series High Performance CPU Cooler