System seems stable but P95 fails. Why worry about it?

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chankey007

chankey007

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I have FX 8350.

I've set VCORE to 1.26. System is running perfectly fine. I am playing BF3 etc for hours and doing development on VMware during office time. Not faced any issue so far (2 days passed).

But the P95 test fails within few minutes (not because of temperature, I think it's because of not getting enough voltage), as 1.3 is the stock voltage for 8350 and I have lowered it a lot.

What are the consequences if I keep running at this low voltage? What are the consequences of failing a P95 test?

I know that this may cause BSOD or data loss etc. (which I haven't seen in 2 days) But I don't worry about that. I take weekly backup of my system. So data loss is not an issue. I want to know will there be any hardware damage due to it?
 
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Vexillarius
There won't be hardware damage.
The real problem with a system this Prime unstable would be silent data corruption. The CPU tells the RAM 2+2=5, or the RAM turns a 4 into a 5. No one notices because the system is just stable enough to avoid fatal errors and before you know it you have corrupted files. This can go on for quite a while before you notice, and at that point your backups may be corrupted as well.
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Vexillarius

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There won't be hardware damage.
The real problem with a system this Prime unstable would be silent data corruption. The CPU tells the RAM 2+2=5, or the RAM turns a 4 into a 5. No one notices because the system is just stable enough to avoid fatal errors and before you know it you have corrupted files. This can go on for quite a while before you notice, and at that point your backups may be corrupted as well.
 
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chankey007

chankey007

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I see. Didn't think about the bad sectors too. Thanks!

I'm running at 1.26V with Cool & Quiet ON and while playing BF3 temps are: 49C (core temp), 68C~70C (socket temp). Ambient temp 27C at the moment. But ambient temp normally stays around 35C and in very hot days it goes up to 42C. I'm using an aftermarket deepcool iceedge 400xt cooler. Are temps fine? Core temp never exceeds 55C (which is still safe as for FX8350 max core temp is 70C (which some say is 62C but AMD changed that)). But I'm hitting almost the safe limit for socket temp. Should I worry about that? My board is 990FX Extreme 4 and case is K281 with an optional side panel fan.

PS: Idle temps: 23C core temp, 50C socket temp. People say AMD chips' temp value is only accurate if it's higher than 40C so 23C is not that correct.
 
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Vexillarius

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The core temps are fine but the socket temp is pushing it, especially if it reaches that temp while gaming.
The difference between the two and the idle socket temp make me think the cooler might not be seated correctly.

If you can't get the socket temp down I'd recommend lowering the multiplier to get things stable, instead of increasing voltage.
 
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bmacsys

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The silent data corruption will eventually cascade into hard drive that won't boot.
 
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bmacsys

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Double post.
 
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chankey007

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If the cooler was not seated properly I won't be getting core temp less than 50 during BF3. I just checked that idle socket temp is not 50. It's between 43-45C. The difference between socket and core temp is high - about 15-20C, I've seen other guys mentioning it.

Regarding lowering of multiplier: Why? That's not what I bought an aftermarket cooler for :( Anyway do you think getting a better cooler than the one I have will help? Like Evo 212?
 
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Vexillarius

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I'm not saying you should turn the multiplier back to stock, just a little bit to get things stable.

Every system has a limit in how far it can be overclocked, aftermarket cooler or not. A lower overclock is preferable to silent data corruption or a lowered CPU lifespan due to temps that are too high, believe me.

A better cooler will help (since you have plenty of room left voltage-wise) but I wouldn't expect a drastically lowered temperature with a 212 Evo.

What is your multiplier at right now?
 
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chankey007

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CPU is not over clocked currently. I have disabled turbo core and the voltage is 1.26 with Cool & Quiet enabled.
 
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Vexillarius

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Ooh I thought you were overclocking, my bad.
In that case you're probably fine if you increase VCore a little until it's stable. Just keep an eye on those socket temps. I still think reinstalling the cooler and reapplying thermal paste might help but its up to you.
 
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chankey007

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OK, I'm ditching this cooler (deepcool iceedge 400xt) and getting 212X. I'll revert back with the results by next weekend.
 
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