I just tested my friend's G.SKILL NQ - he said it'd never been stabilized above its own spec, 1600 CL9. With taking his word forward, I tried 1800MHz with very loose ram timings.
Before showing the result, testbed's info is as follows:
He uses 4 dimms of G.SKILL NQ so the entire memory capacity is 8GB.
Here's OC trials & error (not "errors" - because there's literally only a single error.)
1800MHz 11-11-11-30 2T @ 1.65V
Since my friend said he'd never reached above 1600MHz, I intentionally set loose ram timings: 9-9-9 (default) to 11-11-11. Note that the command rate is 2T at default, and I didn't touch it then because at the moment, I was not sure whether this ram is stable at 1800MHz clock speed.
As you see, 1800MHz CL11 is probably too little for this ram. No error occured. So I tried a bit higher frequency - 1900MHz - at lower ram CL value.
1900MHz 9-11-11-27 2T @ 1.65V
1900MHz 9-11-11 was just fine. With ram timing settings unchanged, I added +100MHz.
2000MHz 9-11-11-27 2T @ 1.65V - failed
Now we see the first (and the last in this post) failure - an error was occured at 2000MHz 9-11-11. I thought that tRCD is the problem, so I loosened it to 12. (or maybe I could choose to raise voltage, but I'd not chose to.)
2000MHz 9-12-11-27 2T @ 1.65V
Got the point! tRCD 11 was too much for 2000MHz, 12 just appropriate.
Then I started to deal with the others - tRP, tRFC, Command Rate.
Here's final ram timing setting for 2000MHz:
2000MHz 9-12-9-27 1T @ 1.65V
Though I knew that tRP hardly affects performance, I tightened it from 12 to 9 just for my loving at symmetry(9-12-9 seems a bit more "beautiful" than 9-12-11
//
After the test is up, I just tried (without anticipation) 2000MHz CL8 (8-12-8) and succeeded to boot but it's unstable. I think if I gain more voltage, 2000MHz CL8 for a budget ram is possible probably.
//
+ Result Added:
2000MHz 8-12-8-24 @ 1.75V stable!
...and here's another discount on CL (2000MHz CL7 - not yet tested)
Thanks for reading
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Originally Posted by Johnny87au
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