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VCCIO and Internal PLL Overvoltage - Page 2

post #11 of 14
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Quote:
Originally Posted by BababooeyHTJ;14385090 
I was having data corruption until I raised my VTT up to about 1.1v. It passes stress tests just fine though.

Hmmm that's interesting....

I just moved mine down from 1.1 to 1.05, I guess I'll put it back.

On a side note I'm on my way to stable 4.7 Ghz @ 1.368 load.

I think it was enabling Internal PLL Overvoltage, but I wish I knew what it really did. I couldn't boot even at like 1.38 before without this setting enabled... after I enabled it I could boot at 1.34.
    
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post #12 of 14
Hi bud, you managed to gain some more info on these two settings in past weeks?
post #13 of 14
VTT certainly helps the OC. It is the internal memory controller voltage which is on-die within the chip.
Even with the vcore high up, if the IMC won't have enough juice, it gives you problems.
Also having more ram = more stress on IMC so you need more VTT.

Not so sure about the CPU PLL. I was playing with it last night and found interesting stuff.
My temp goes UP when I make the CPU PLL LOWER than 1.832.
It passes the test (used quick LinX w/AVX all ram) fine with 1.750.
But it gives me 3c higher in temp.
I though I was doing something wrong so I went back to 1.832 and test it and did the 1.750 again.
But the results are the same. (I tested it 3 times back and forth)
1.832 runs cooler than 1.750.
Weird but that is what I got and also I get better score at 1.832 (133+GFlops) opposed to 1.750 (131~2GFlops).
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post #14 of 14
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Quote:
Originally Posted by Zumbba;14710277 
Hi bud, you managed to gain some more info on these two settings in past weeks?

Yes, I have.

Optimal VTT/VCCIO for me was actually not 1.1, but 1.077. 1.051 (my stock) was pretty good and a bit better than 1.1v as suggested, but in the end 1.077 was just much better. It took a lot of testing and to be honest I cant say that these findings are 100% correct because of the nature of stability testing (ie you can never be 100% certain), but I had very improved results. Right now I'm about to go lower my vcore and see if things still work.

I think the thing to do is to raise it one or 2 ticks if you are at high voltages / clocks, and see if it helps. I also run Prime with heavy RAM usage so that could be a reason I benefited.
    
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