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post #1721 of 9641
Well, here is an update to my pain!

I have not been able to get the system to pass Prime Blend (It literally fails instantly, less than 4 seconds for all 4 cores), on stock speeds/settings. The only thing I have changed in bios is the ram volts are at 1.65v (1.6v is the auto default) and the SB @ 1.25v due to the number of disks, and the fact that 2 SSD's are striped.

After talking with many about this, the general consensus was either a bad CPU, or corrupt o/s. Since I had just installed the SSD stripe when all this became evident, I tried removing the disks (unplugging them) and installing W 7 & on my WD green 750 in ide mode.

So, I install on the 750, load all the drivers etc... get everything done, and it fails Prime blend instantly. It will also just randomly reboot with lines across the screen, no bsod (this is sounding repetitious, isn't it?). This random rebooting and failing Prime blend is the same on the SSD's as well, no difference between the SSD stripe and the 750 in ide mode.

It might be worth noting that Prime sm. fft's seem to be just fine, I honestly haven't ran it longer than about 10 mins, because blend fails all cores within 5 seconds, usually even quicker, so I figure if sm fft's are going 10 mins without issue, it'll probably go much longer.

So, it seems I cherry picked the bad chip out of 11! haha on me, huh?

Any suggestions?
I'm going to rma this chip next week when the C3's are at MicroCenter anyway, but it would be nice to know if that is going to be the resolution to my problem (replacing a bad cpu, is it bad?).

Marc
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post #1722 of 9641
Say its bad and just RMA it anyway to get a C3. Been following the thread and it sounds quite dodgy.

Have you tried putting everything back to stock with the old drive?
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post #1723 of 9641
Quote:
Originally Posted by NCspecV81 View Post
I've been able to recreate a condition in which my board does not POST due to NB frequency. I'll post my findings later when I get home so that I can jot down all my bios settings. I have a feeling this is probably what you guys are encountering with it being stable one moment and not posting the next. Now that I know what is causing it I never encounter this anymore. =o) There is a couple key components in the bios to allow for a high NB frequency.
Great id love to hear your conclusions
post #1724 of 9641
Quote:
Originally Posted by mduclow View Post
Well, here is an update to my pain!

I have not been able to get the system to pass Prime Blend (It literally fails instantly, less than 4 seconds for all 4 cores), on stock speeds/settings. The only thing I have changed in bios is the ram volts are at 1.65v (1.6v is the auto default) and the SB @ 1.25v due to the number of disks, and the fact that 2 SSD's are striped.

After talking with many about this, the general consensus was either a bad CPU, or corrupt o/s. Since I had just installed the SSD stripe when all this became evident, I tried removing the disks (unplugging them) and installing W 7 & on my WD green 750 in ide mode.

So, I install on the 750, load all the drivers etc... get everything done, and it fails Prime blend instantly. It will also just randomly reboot with lines across the screen, no bsod (this is sounding repetitious, isn't it?). This random rebooting and failing Prime blend is the same on the SSD's as well, no difference between the SSD stripe and the 750 in ide mode.

It might be worth noting that Prime sm. fft's seem to be just fine, I honestly haven't ran it longer than about 10 mins, because blend fails all cores within 5 seconds, usually even quicker, so I figure if sm fft's are going 10 mins without issue, it'll probably go much longer.

So, it seems I cherry picked the bad chip out of 11! haha on me, huh?

Any suggestions?
I'm going to rma this chip next week when the C3's are at MicroCenter anyway, but it would be nice to know if that is going to be the resolution to my problem (replacing a bad cpu, is it bad?).

Marc
You will be happier with C3 i wont be surprised if you hit 4.5Ghz stable on it
post #1725 of 9641
Quote:
Originally Posted by XAnarchy View Post
Say its bad and just RMA it anyway to get a C3. Been following the thread and it sounds quite dodgy.

Have you tried putting everything back to stock with the old drive?
Yup. I've tried it with all settings on stock, and I've tried it with the cpu volts lowered, I've tried with the NB volts increased little by little, tried everything I could think of to try and get the stock speeds to pass prime blend... no luck. It ALWAYS fails all 4 cores instantly.

Marc

EDIT: I talked to a guy I know, who's opinion carries weight with me, and essentially he said two things (without replaying the ten minute conversation):
1. It's the chip.
2. It's probably because you 'low volt' burned the chip. "Why did you do that?", he asked.
He suggested when I replace it next week with the C3 to just raise the volts at stock speed until it's unstable, back it off a touch and start raising the speeds. This is how he has always done it, he said, and he's got a 720(unlocked) at 6.1Ghz, so I'm listening.
Edited by mduclow - 11/10/09 at 10:42am
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post #1726 of 9641
c3 has got some legs!

New CPU-Z validation @ 5.246GHz



http://valid.canardpc.com/show_oc.php?id=820327
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post #1727 of 9641
Quote:
Originally Posted by NCspecV81 View Post
I will when I get home. I'm at work right now and don't have access to my bios. However the CPU-NB VDD and CPU-NB Voltage are very important to achieving a high NB frequency, other than cpu temps itself.

CPU-NB VDD voltage adjustments shouldn't be necessary as I used AUTO up until 3300mhz in linx and have posted at 3600mhz NB. However, if you adjust your CPU-NB VDD voltage up it has the ability to become severely unstable and in a lot of cases not even post.

Conversely, the CPU-NB Voltage is the key setting for NB frequency. I use approx 1.55v on this setting, but the odd part is if you adjust the CPU-NB VDD voltage to appox 1.48v it's no longer in red on the CPU-NB voltage @ 1.55v. Although, not stable at all and won't even post @ 3300mhz for me until I drop down the CPU-NB VDD and up the CPU-NB. Actual NB voltage doesn't seem as important to NB frequency as the CPU-NB and CPU-NB VDD voltages.

Your results may vary b/c I'm actually using some spare i7 ram I have (dominator gt's) until I get iandh's ocz's. Apparently i7 ram isn't that great of a choice on amd 790's.

When I get home I'm going to start playing more with the NB voltage and ram dividers to see what effects those have.
You are right...im at 3Ghz CPU-NB right now...
post #1728 of 9641
I have an observation to share. Using the 1.7b7 BIOS you'll maybe encounter "HT sync flood errors". I got RAM at 1600+ and was reading through the BIOS changes and in 1.61 they changed the DDR3-code/parameters.
So I flashed 1.60 to see what's going on and there are no "sync flood" errors with identical settings anymore, just freezes which can be cured with lowering speed on the CPU-NB.

If the message really is right and they put it into the BIOS for clarification, I'd say the culprit is the HT-link going to PCIe ("HT sync flood" errors come almost allways as frame-buffer corruption, vertical stripes, blank, reboot). Sometimes in a edge-case I ran prime95 for a while without problems, then I moved the mouse over the start-menu and bang (there are graphic effects onhover going on). In even more edge-cases when W7 initializes the PCIe on boot it just reboots (without that, eg. from a liveCD there is no crash at all).

Besides lowering NB clock, and/or lowering FSB clock I haven't yet found a voltage which would help stabilizing this issue. I'm pretty sure it doesn't have anything to do with the IMC and the core's HT-link itself.
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post #1729 of 9641
Quote:
Originally Posted by dir_d View Post
You are right...im at 3Ghz CPU-NB right now...
so alls well now? This seems to be the case on my board. Upping CPU-NB VDD will impact your NB frequency negatively. Kinda curious what happens when you lower it more than what it is at auto. Hmmm ideers ideers ideers...
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post #1730 of 9641
Quote:
Originally Posted by NCspecV81 View Post
c3 has got some legs!

New CPU-Z validation @ 5.246GHz



http://valid.canardpc.com/show_oc.php?id=820327
Very Nice!

In an effort to stabilize my RAM, I started doing a couple things differently regarding the voltages, this is experimentation as I honestly have no clue what the difference between the VDD voltages and the regular CPU or CPU-NB voltage is.
At any rate, here's what I've been doing. (With all settings to auto), I move the CPU VDD voltage and CPU-NB VDD voltage up 1 step so they're an actual number. Then I use the VDD voltage to set whatever my desired voltage in the CPU setting is. When adjusting the VDD voltage, whatever you're adjusting goes up with it. So far it's seem to have worked very well.

Although I am getting this:

Quote:
Originally Posted by Ethatron View Post
I have an observation to share. Using the 1.7b7 BIOS you'll maybe encounter "HT sync flood errors". I got RAM at 1600+ and was reading through the BIOS changes and in 1.61 they changed the DDR3-code/parameters.
So I flashed 1.60 to see what's going on and there are no "sync flood" errors with identical settings anymore, just freezes which can be cured with lowering speed on the CPU-NB.

If the message really is right and they put it into the BIOS for clarification, I'd say the culprit is the HT-link going to PCIe ("HT sync flood" errors come almost allways as frame-buffer corruption, vertical stripes, blank, reboot). Sometimes in a edge-case I ran prime95 for a while without problems, then I moved the mouse over the start-menu and bang (there are graphic effects onhover going on). In even more edge-cases when W7 initializes the PCIe on boot it just reboots (without that, eg. from a liveCD there is no crash at all).

Besides lowering NB clock, and/or lowering FSB clock I haven't yet found a voltage which would help stabilizing this issue. I'm pretty sure it doesn't have anything to do with the IMC and the core's HT-link itself.
But I don't get any error. Just when I get to a certain setting, I start getting frame buffer corruption like Ethatron. I have been debating on whether or not I should increase PCIe voltage slightly to "get a better signal".
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