[SOLVED] XMP wont work properly with B450M-A board

[talhaskrillx]

I had G.skill Ripjaws V DDR4-3600MHz CL19-20-20-40 1.35V 16GB (2x8GB) kit.
It was working great with XMP profile at 3200Mhz because that's what my board(B450M-A) supports.
But today I bought another Ram Kit which is G skill DDR4-3600MHz CL18-22-22-42 1.35V 16GB (2x8GB). But pc won't post on XMP profile.
Bios set the clock at 1866Mhz and the max it can go is 2866MHz if I set it manually.
If I activate the XPM profile pc doesn't post and bios go into safe mode.

Things I have tried:
- Switching the rams slots
-Changing timings manually
-Changing Voltage manually
- Setting clock speed manually

My PC:
CPU: Ryzen 7 2700 @ 3.20 GHz
Board: Asus B450M-A
Bios Version:3211
Memory Slots using: 4/4

 

[Lutfij]

Welcome to the forums, newcomer!

What BIOS version are you working with for your motherboard? FYI, the RyZen 2000 series processors were good up to DDR4-3200MHz rams, anything higher and you'd need to go into lots of hair pulling or minor adjustments in BIOS, manually. Safe to say that the ram kit you have should go to DDR4-3200MHz with laxed timings.

 

[talhaskrillx]

Hi! Thanks for the reply.
I am on the latest bios version 3211.

 

[scout_03]

you did mix 2 ram kit they dont have the same jedec settings so use cpu-z spd to find if they could have a similar jedec settings you could manually put on with the same voltages mix ram does not always work .

 

[talhaskrillx]

you did mix 2 ram kit they dont have the same jedec settings so use cpu-z spd to find if they could have a similar jedec settings you could manually put on with the same voltages mix ram does not always work .

I didn't quite get that.
Cpu z is showing the same JEDEC # on all the slots. The only difference I can see is the part number.

 

[talhaskrillx]

CPU-Z images
Here are the SPD images

 

[bfollett]

You may not get 3600 to work with a 2700x. It might run but may require some tweaks to voltages, and terminal block and cad bus settings. If you want the easier root, you could just load the xmp settings and then start dropping the frequency one step at a time till you find what is stable. You could then try tightening the timings at that setting if you want to optimize performance.

 

[mamasan2000]

I would try 3200 Mhz @ 18-20-20 (18-20-20-20-40-60) as a starting point. At least the sticks are all single rank, easier on the memory controller with 4 sticks.
First Ryzen platform where 3600 Mhz XMP might work was the 3000-series. On 5000-series RAM is guaranteed to work at 3600 Mhz. But theres always variation in motherboards, RAM etc. Might have to give RAM some extra juice, like 1.38-1.4 volts.

 

[talhaskrillx]

I would try 3200 Mhz @ 18-20-20 (18-20-20-20-40-60) as a starting point. At least the sticks are all single rank, easier on the memory controller with 4 sticks.
First Ryzen platform where 3600 Mhz XMP might work was the 3000-series. On 5000-series RAM is guaranteed to work at 3600 Mhz. But theres always variation in motherboards, RAM etc. Might have to give RAM some extra juice, like 1.38-1.4 volts.

I tried the timings you mentioned above but pc doesn't post and Bios start in safe mode.

 

[mamasan2000]

I tried the timings you mentioned above but pc doesn't post and Bios start in safe mode.

At what DRAM voltage? Gotta be minimum 1.35. Try 1.4 if that doesn't work. Turn off Fast Boot.