tREFI поставьте на максимум.

Now that we've gotten frequency and primary timings taken care of, it's time for secondary timings. While you will see small gains from most of these timings, I want to focus on one very important secondary timing. tRFC. You see, memory is a matrix of billions of capacitors that need to be recharged. You have tRFC, a secondary timing, that works alongside tREFI, a tertiary timing. Every <tREFI>, they are recharged in order, for <tRFC> amount of time. Simply put: tRFC is the mount of time your ram can do nothing, while being recharged. tREFI = the amount of time your ram can do things, before needing recharged. Both are very important, and have significant impact on your latency. tRFC works best as low as you can get it, and tREFI functions best as high as you can get it. tRFC, in my testing, is best left at 270, as it's the easiest value to keep stable, while having the best gains in performance. tREFI on the other hand, can go as high as 65535 and not really matter, but can potentially lead to corruption if your motherboard's quality is lackluster. The warmer your DIMMS, the more often they need recharged. If mobo is bad, it can't recharge high enough to meet the required interval. Basically, if motherboard is bad, stick to the JEDEC standard of 7.8usec refresh interval. If your ram is 3000mhz, the formula is 1500 x 7.8 = 11700. If your ram is 3600mhz, the formula would be 1800 x 7.8 = 14040 tREFI.