CPU unable to run at standard core multiplier

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Venatius

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Jul 23, 2013
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Hello! I've just started having a strange issue with my CPU. Here's a little context, as I've had a few other odd hiccups that might or might not be related. For a while I started having occasional hyper sync transport flood errors leading to system crashes, as well as periods where my display would briefly stutter/lag. For some reason these only occurred while running a web browser (computer games, even demanding ones, didn't cause a single problem). Not long after this, I had a PSU failure. I bought a new one, a 750w Cougar RS. I set it up and everything was seemingly just fine.

Then a week later, while running a fairly graphics-intensive computer game computer game, the system abruptly lost power. I was able to turn it back on without a hitch, but it refused to boot - it would go through the BIOS just fine but the monitor would go black after about one second on the Windows startup screen. After an experimental reset of my BIOS to its failsafe settings, I discovered the system wasn't booting Windows successfully with the CPU at its standard core multiplier. I'm running an AMD Phenom II 1100T Thuban, a 3.3 GHz processor which normally has a multiplier of x16.5. It seems I can get it booting consistently if I underclock that to x7 (though it looks like I can push that to x9).

Is it possible (inferring from the power loss) the new PSU is no good and isn't supplying enough power to run at x16.5? Or is it likelier the CPU itself is somehow screwed up, or something else?

Specs (with links to relevant websites for more detailed info):
Motherboard: MSI 880GM-P51
PSU: Cougar RS 750w
Processor: AMD Phenom II x6 1100T Thuban
Graphics: Nvidia GeForce GTX 560 Ti (by Gigabyte)
RAM: Patriot 2GB 1333MHz DDR3 (x2), Kingston 2GB 1333MHz DDR3 (x2) (8GB total)
OS: Windows 7 Ultimate (x64)
 
Solution
Sn1992-1361850
It seems that something is wrong with ur board
If its in warranty go to the service center
But before goin there i wud advice to check another processor if the other cpu works fine u need to get to the amd service centre
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Venatius

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Jul 23, 2013
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So the problem might just be the change in power supply? Interesting. I should have mentioned my old PSU was a 600w Thermaltake. I'll try resetting the CMOS in just a little while and see what happens. Thanks for the idea!
 
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Venatius

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Jul 23, 2013
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Bad news, I'm afraid. It doesn't seem like the CMOS reset worked. I hopped the jumper on my mobo over, started up, shut down, hopped it back, and the BIOS and everything was reset. (I assume this was the right way to do it? Smack me if I'm wrong) To my considerable joy, I saw the CPU reported as 3.3 GHz as it should be, with the multiplier set on "Auto". I set everything up in the BIOS and let it boot. Unfortunately, on checking My Computer, speed was back down to 1.4 GHz. I went to the BIOS and confirmed it had jumped the core multiplier back down to x7. Setting it manually back up to x16.5 caused the same inability to boot as before.

For reference, my old PSU was a TR2-600NL2NC ATX12V & EPS12V Power Supply.

Also for some reason all my security certificates have been reset. I guess a CMOS reset does that?
 
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Sn1992-1361850

Sn1992-1361850

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Jul 13, 2013
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Ur power supply is not enough for o.cin if u did

And cmos is designed to reset the settings
Perfrm cmos reset again
Install overdrive n try increasing multiplier
Even if it not wrks
Enter in bios and dissable cool n quite then chnge multiplier


Let me know what r the result i think it can be solved

And yes try with the 850w supply nt the crrnt one for all of the above
 
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Venatius

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Jul 23, 2013
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Thank you for the suggestions, but I wasn't clear, I think. My old power supply (which was a 600w) broke entirely. It's fried. I've only got 750w now. The CPU isn't overclocked. It's meant (at least, I'm 99% sure?) to run at x16.5 (for a 3.3 GHz speed), and has for years. For some reason my motherboard seems to think it's supposed to run at x7 and sets it to that by default, but I manually set it to x16.5 and that was fine until this started. Now I can't seem to run it on anything but x7, though I think I can push it as high as x9. x10 or higher seems to cause the problem to reoccur. When I reset it like you said, it acknowledged it as a 3.3 GHz processor again, but the "Auto" multiplier it defaulted to set it back to 1.4 GHz. I tried running without my graphics card in place in case that would free up enough power, if that was the problem, but it didn't work. Thanks again for your help, by the way. I really hope this can get straightened out. I went ahead and ran a RAM test just to cover another common system problem, but it doesn't seem to be the issue at least according to the test. No errors.
 
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Venatius

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Jul 23, 2013
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Sure thing. I assume you mean close when it's figured out/solved, right? If you meant now, I'll do that right away. Sorry, I'm new to how these forums work.
Anyway, I'm using Overdrive to inch the multiplier up a half-step at a time (as it won't seem to let me go faster than that). It isn't seeming to let me go higher than x15.5, and on top of that, once it hits roughly x14 or higher, it crashes (black screen, no video input) after a short while. I've tried running without my video card in case it's competing for too much power or something, or in case it was screwing up the display, but that doesn't seem to matter. This seems like the sort of thing that would happen trying to overclock, not just raising it to its normal multiplier.
 
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Venatius

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Jul 23, 2013
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I was afraid that might be the case. Thank you anyway. Do you think there's any possibility the fault is in the new PSU (like maybe it's partially gone haywire and just isn't supplying enough power)? Anyway, I'll take it to a computer shop and see if they can figure out if the problem is the CPU or the mobo (or both).
 
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