Alright, here is the thing. My computer is kinda old Phenom II x3 720be running on Gigabyte GA-MA770T-UD3P motherboard with 4GB memory, G.Skill ddr3-1600 PC3-12800 2048MBx2. So i decided to upgrade my memory out of a sudden, since i found the same one in the local store, or at least i thought so. When buying a new memory i was looking at the part number and timings, so my memory is F3-12800CL9D-4GBNQ CL9-9-9-24, but when i inserted two new sticks, my system wouldn't even boot, so i had to clear cmos and reset the timings...and here is what i found. In CPU-Z it says that my old sticks have the Max Bandwidth PC3-10700H (667MHz) and XMP 0.0 XMP-1600 800Mhz 9.0 9 9 24 40 2T; the new sticks though, have this:Max Bandwidth PC3-12800 (800 Mhz) XMP 1.2 XMP-1600 800 MHz 9.0 9 9 24 33 2T. All the sticks are the same part number F3-12800CL9-2GBNQ DDR3-1600, but the old two have been bought in 2009 and the new ones have been manufactured in September 2015. So the only way to make system boot and be stable, was to play with timings a bit, in BIOS it says that the old two sticks have the tRFC for DIMM 110ns in SPD and the new ones have 260ns, so to make them all work together at 1600MHz i had to change all four tRFC values to 300ns, that way the system would perform normally. All the other timings are the same as XMP-1600 on the new sticks. So my question is whether i won't run into any errors or blue screens with these kind of settings?
Because all the sticks are the same, but the new ones have been kind of upgraded.
I have attached the CPU-Z Report with some pictures.
![Confused](https://www.gskill.us/forum/core/images/smilies/confused.png)
![Smile](https://www.gskill.us/forum/core/images/smilies/smile.png)
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