*Help* Upgrading from 8 GB to 16 GB RAM caused a decrease in performance.

[helzus]

After installing two additional sticks of Corsair Vengeance Pro Series 8GB (2x4GB) DDR3 1866 MHZ (PC3 15000) Desktop Memory (4 of the exact same RAM in total adding up to a grand total of 16 GB RAM), my overall FPS in Wildstar dropped by 10-30 frames everywhere, with random ups and downs. I did check my BIOs, the latency and voltage are correct. Anyone have a solution to this? I don't really understand how adding RAM would decrease performance. I've even removed 8 GB to test it out, and Wildstar ran more smoothly with a 10-30 FPS increase.

My specs:
Intel Core i7-4770K
MSI Z87 GD65 GAMING Motherboard
Corsair Vengeance Pro Series DDR3 1866 MHZ (x4)
EVGA GEFORCE GTX 780 3 GB

Tested both the old set and the new 8 GB sets individually, both run at the approximate same FPS. But when I run them together, Wildstar drops 30 FPS.

Old 8 GB: ~105 FPS
New 8 GB: ~105 FPS (Same slots as old ones, 1 and 3)
16GB: ~75-80 FPS
8 GB in previously unused sockets: ~95-100 FPS (Slots 2 and 4)

 

[Tradesman1]

What set(s) of DRAM (model#), do you have the latest BIOS? Often when mixing sets the secondary and tertiary DRAM timings will be off and need to set manually....the BIOS should do it but often does a poor job 😉

 

[helzus]

I'm not quite sure about the model # but both the boxes have CMY8GX3M2A1866C9 on a label in the back so that might be it.
*Edit: Never mind, I'm updating the BIOS at the moment.

I've also checked with CPU-Z, and the BIOS, the memory appears to be running at the correct frequency and latency. I also have X.M.P. enabled.

It's my first build so I'm not really knowledgeable. Memory seems to be quite a fickle component, seeing as how my first set was DOA, which prompted me to buy a second set. Now this third set is actually decreasing performance.
*Edit: I've linked the RAM I bought in the original post.

 

[Tradesman1]

OK, let me know if the BIOS update helps, if not, take a look in the Advanced DRAM timings and see what tRFC timing is set at

 

[helzus]

Unfortunately, the BIOS update didn't help. I looked in the BIOS under the Memory-Z category and came up with tRFC: 300.0000ns (200CLK) for all four sticks of memory. There was another category, X.M.P. Support Information, that showed tRFC: 260.3750ns (243 CLK) though.

 

[Tradesman1]

Might try tRFC at 220 and see if it will boot with that, if so we'll need to look at tightening about prob 4 additional advanced timings

 

[helzus]

I have no idea how to change tRFC timings though. Everything under Memory-Z was just read-only and couldn't be changed.
*Edit: Just checked with CPU-Z and it says the tRFC: 244 clocks. Three different values?

 

[Tradesman1]

Have to go into the BIOS to make changes

 

[helzus]

Okay, so I had to enable Link mode to get at the Advanced DRAM configurations. Set tRFC at 220 and it booted up just fine.

 

[Tradesman1]

What are the other timings and settings on the advanced timings, the BIOS isn't setting things well, we'll see what we can tighten down.

 

[helzus]