Originally Posted by ForTheRepublic
Greetings. So, I am relatively new to overclocking, and I have a few questions regarding RAM, and specifically pertaining to this motherboard. I bought two 8GBx2 DDR4 RAM kits from G.Skill (RAM is quite expensive these days, so I waited for sale discounts which is how I ended up with the two slightly different ones); one of the kits has Part Number F4-3200C14-8GTZR, and the other F4-3200C14-8GTZRX , with the "X" version only serving to designate that it is meant specifically for Ryzen CPUs as far as I can tell; however, other than that, the kits appear to be identical.
Neither kit is on the Qualified Vendor List for this board (however, I realize these are not exhaustive lists), so my questions are as follows:
1) Does the "X" make any difference aside from a marketing perspective of indicating explicitly its compatibility with the Ryzen CPU; i.e., it should not pose an issue to pair the two kits with one another because they are essentially the same exact RAM, correct?
Well, the Thaiphoon screenshots would certainly indicate they're essentially identical. I'd not be surprised at all if they were in fact exactly the same for this particular case of the G.Skill GTZR vs. GTZRX.
2) Is anyone using this RAM (Ryzen- specific "X" version or otherwise) with their Gigabyte K7 and able to run them at their specified speed rating (or higher; although my goal is simply to have them operate at their specified frequency) without issue? If so, please be so kind as to share your bios configuration and/or tips for getting it to work.
Yes! I'm using two kits of F4-3200C14D-16GTZR (a total of 4x of the same F4-3200C14-8GTZR non-X 8GB modules) in my X370 Gaming K7 with an R7 1800X
. They've worked fine at 3200MHz since day 1. Originally I just toggled on XMP and left it at that. Later I used an earlier version of 1usmus's Ryzen DRAM Calculator (1.4.0) to dial in some more aggressive settings. Here's what I have presently that's been completely stable with my R7 1800X:
Other relevant BIOS (F7a) settings (ones not shown or not reported in Timing Checker):
vSOC = 0.91875v (I think my 1800X's memory controller just ended up being very good quality)
DRAM Voltage = 1.34v (results in flipping between 1.368 and 1.380 reported in HWinfo)
ProcODT = 53.3
RTT_NOM = RZQ/7(34)
RTT_WR = Off
RTT_PARK = RZQ/6(40)
With the help of 1usmus 's
DRAM calculator, I have been able to get the RAM running stably at 3200 MHz with no errors, however when cold booting or rebooting the computer, the motherboard fails at RAM training and gives me a boot failure notification (code F9). After entering the bios proceeding the prompt from this error mesage, loading the 3200Mhz configuration settings I have saved to a profile, and saving and exiting, the PC will proceed to boot without issue. I have tried playing around with various voltages to remedy this, staying within the DRAM calculator's recommendation, but have not had success. Does this indicate that I need to go back to the drawing board and try a different procODT setting (the DRAM calc's first recommendation of 48 ohm produced errors, and I'm currently using 43.6 ohm; I have not attempted 53 ohm based on the stability I found with my current setting, but perhaps it's necessary?). Perhaps updating the bios would be worthwhile (I am currently using version F30)?
I think there may be a display error in v1.6.2 of Ryzen DRAM Calc regarding the "Rec." RTT_PARK setting.
Notice it's suggesting RZQ/1 for the recommended, which would actually be 240 Ohms, not the "(48)" it also lists there. To get 48 Ohms you'd need to use RZQ/5, as it correctly shows in the Alt. 1 and Alt. 2 entries.
When I was recently trying to dial in a good actual 1T command rate configuration (with GearDown disabled) based on the v1.6.2 calculator, I struggled for a long time before catching that RZQ/1 issue in RTT_PARK. Once I changed it to RZQ/5 to correctly set 48 Ohms things immediately improved and I stopped getting the repeated memory re-training on restarts, similar to what you're reporting. I haven't been able to get true 1T completely stable yet though, so I reverted to what I listed above with the Timing Checker for now.
I also found this article by 1usmus in my research, which I've found extremely helpful in going into the details of RAM tuning for Ryzen:
I haven't had the time yet to dedicate to following its advice and systematically dialing things in, but it seems like an excellent resource, and it increased my understanding of the various factors in Ryzen memory tuning by a lot.