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[Official] ASUS Crosshair V Formula (990FX) club - Page 454

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  • 34% (35)
    Should I leave the list combined for both the CHVF and CHVF-Z
  • 65% (67)
    Seperate the lists
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post #4531 of 9900
Quote:
Originally Posted by gr8sho View Post

VDDA:
I've seen more than a few posts about this voltage and its affect on overclocking. It's new to me as it didn't exist for the Phenon II X4s. If someone would like to expound on this a bit more, I'd appreciate it.
A value I've seen used is about 2.7V.
Thanks

So far this is all I've come across http://www.overclock.net/t/762641/voltages-whats-what-and-what-they-mean
while it may be slightly in need of a little updating it explains the basics.

I've played with VDDA on my "Z" when things got tough and found it had no affect for my OC, in fact made things even more unstable. I believe the the Digi + II Power control is really doing it's job. I'm finding it's the smallest adjustments that can make or break stability. So far VDDA hasn't been one of those in my case. It could be due to the fact I'm running a higher ref clock and less cpu multiplier. If memory serves me, the CHVF-Z's bios doesn't turn red in VDDA voltage until 2.8v or so.

Have you noticed most all that benefit from additional VDDA are not running on a CHV?
Check this out if you haven't seen it,
http://www.overclock.net/t/1331219/fx-83xx-data-collection-thread
 
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post #4532 of 9900
Ok, thx. VDDA didn't make any difference so I'm going to turn it back to stock.

I'm not by rig now, but I'm battling an odd problem getting any form of stress run working at 4.8 - 4.9 GHz. The system will just freeze as soon as the workload ramps. I'm 99% sure it's not a temp issue.

I'm not sure which knob needs to be turned up. I'll share the settings I'm on later.
post #4533 of 9900
Deleting duplicate post via iPhone.
post #4534 of 9900
Quote:
Originally Posted by gr8sho View Post

Ok, thx. VDDA didn't make any difference so I'm going to turn it back to stock.
I'm not by rig now, but I'm battling an odd problem getting any form of stress run working at 4.8 - 4.9 GHz. The system will just freeze as soon as the workload ramps. I'm 99% sure it's not a temp issue.
I'm not sure which knob needs to be turned up. I'll share the settings I'm on later.

not sure if i understood well your problem but on the same kind of things i noticed that each cpu stress with LLC on extreme drives the whole pc to freeze....turning LLC on ultra or lower fixed it for me....no idea what happen though as i used LLC extreme for my phenom without anykind of trouble
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post #4535 of 9900
im using ultra as well. extreme didnt freeze me but it did raise the voltage way too high. set at 1.475v high wasnt preventing dips. ultra does raise it to 1.488, i may lower the voltage a tick since it seems pretty steady
just using cpu-z to read it
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post #4536 of 9900
Yes, I get the general idea of LLC different states. Ultra high should be good enough for this type of load, so that's what I'm on now.

I must be missing something basic to have a stability issue at this speed. I think I've relaxed DRAM settings a bunch to remove that from the equation.

Is there a general rule of thumb when it comes to freezes? Is it typically a sign the CPU doesn't have enough voltage or something different. The type of freeze I'm talking about is one that requires a hard shutdown. Reset button doesn't even bring the machine back to life.

I disabled CPU and PCIe spread spectrum. I forgot about these.

I'm also running off of DOCP vs MANUAL. Maybe I switch this one too...
post #4537 of 9900
Quote:
Originally Posted by The Sandman View Post

Check this out if you haven't seen it,
http://www.overclock.net/t/1331219/fx-83xx-data-collection-thread

This is helpful and actually helps me make a point. For instance, if you look at UncleBlitz's data, he has a relatively straightforward type of attempt. If I understand the data correctly, it's mostly the settings from AUTO but with the CPU Multi and a few voltages jacked up. I'm also picking on his data because his memory setup looks identical to mine.

The other 5GHz run looks interesting too. That one was achieved by bumping CPU Frequency and VDDA among other settings.

Both users have customer water loops, but I don't think the H100i will hold my system back at the 5GHz speed, at least I have no indication of that right now. Some setting I can't put my finger on is causing the machine to lock immediately when the benchmark programs start up.
post #4538 of 9900
Quote:
Originally Posted by gr8sho View Post

This is helpful and actually helps me make a point. For instance, if you look at UncleBlitz's data, he has a relatively straightforward type of attempt. If I understand the data correctly, it's mostly the settings from AUTO but with the CPU Multi and a few voltages jacked up. I'm also picking on his data because his memory setup looks identical to mine.
The other 5GHz run looks interesting too. That one was achieved by bumping CPU Frequency and VDDA among other settings.
Both users have customer water loops, but I don't think the H100i will hold my system back at the 5GHz speed, at least I have no indication of that right now. Some setting I can't put my finger on is causing the machine to lock immediately when the benchmark programs start up.

With the Phenoms freezing was usually either dram voltage or CPU/NB voltage (sometimes a combo of the two) but this Piledriver is very touchy (unlike the Phenoms) so I can't say it's positively the same.
Usually when filling all four dimm slots some additional voltage (listed above) would be expected. It's not uncommon with the AMD platform to have to run an additional .05v to .1v for Dram voltage to stabilize even stock settings. Just something to bare in mind.

You may be having difficulties depending on the kit/s you have. Is it one matched kit of 4 x 4GB, or two separate kits just put together? Sometimes this works out and other times it doesn't. The 2 x 8GB kits are the way to go as they create a lot less stress on the IMC vs the 4 x 4GB's.
 
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post #4539 of 9900
lol...and i you "enter" the prime95 stressing u have to revisit ur OC @ same cpu voltage... 4.9 stable is nearly impossible even with a middle range custom loop

so i m restarting the whole oc from stock but with prime95 aka stress reference tool

for now i m @ 4.5ghz with 1.45v(bios) and LLC on ultra, it seems rock solid under occt, ibt and prime95 but....as i see what voltage i had to put in i ll be very happy to hit a stable 4.8ghz with max cpu core temperature under 60°c
for the test i ve backed my ram @ 1333 and all the cpu nb stuff on auto
other point i had 2 bsods while playing crysis with the ram @ 1600....backed @ 1333 it runs fine...i bet i ll have to put more juice in ram voltages to get them stable @ 1600....but for now i try to focus on cpu frequency limit






it seem that p95 requires a lot more cpu voltage than occt and ibt, and tbh 20 runs of ibt doesnt mean 100% stable wink.gif
Edited by UncleBlitz - 12/2/12 at 3:14pm
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post #4540 of 9900
Quote:
Originally Posted by The Sandman View Post

With the Phenoms freezing was usually either dram voltage or CPU/NB voltage (sometimes a combo of the two) but this Piledriver is very touchy (unlike the Phenoms) so I can't say it's positively the same.
Usually when filling all four dimm slots some additional voltage (listed above) would be expected. It's not uncommon with the AMD platform to have to run an additional .05v to .1v for Dram voltage to stabilize even stock settings. Just something to bare in mind.
You may be having difficulties depending on the kit/s you have. Is it one matched kit of 4 x 4GB, or two separate kits just put together? Sometimes this works out and other times it doesn't. The 2 x 8GB kits are the way to go as they create a lot less stress on the IMC vs the 4 x 4GB's.

Okay. I haven't touched the DRAM settings at all other than to drop the selector speed to 1366 in my more recent attempts with upping the FSB. Overall effective speed is still less than the 1600MHz speed the parts are rated for. And yes, the 2 Sniper kits are identical. Bought at the same time.

For the CPU/NB voltage, I used to increase that for my 965 to speed up the IMC. In that scenario, I ran up at 1.325V. Right now I have it set at 1.25V

As I said, DRAM voltage is set to stock 1.5V.

I'll take a look at upping these values as well in some future runs to see what impact if any they have on the freezing problem.

This is all in the spirit of trying to stabilize this system at 4.9GHz range.

BTW, the system posts just fine at this speed and boots nice and fast into Windows 7. Coretemps hover between 20 and 30 C as I work with Firefox and check some of the sensor programs I'm running.
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