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Defective 8350? - Page 2

post #11 of 19
Oh, another thing. This is what happens with undervolting:

- When you are undervolting way lower than needed, you boot into Windows, it may seem stable, you can even pass Blend in Prime95. Where you will see failure is large FFT in Prime95 and it will reboot/BSOD.

- When you raise the voltage but you are still not at the right one, Prime95 will crash.
- When you raise voltage but still you are undervolting too much, you don't get BSOD, you don't get Prime crash, you get Prime stop with rounding error on one core. Then you know you 're close to the minimum needed voltage.

Yours sounds more being at the 1st stage (way too low voltage).

And remember. What counts is the effectively delivered voltage, not the one set in BIOS. You can set 1.4v in BIOS, if it gives 1.2v in reality, what matters is the 1.2v, not the 1.4v. See again your LLC. In my board, there is difference between what "Auto", "Enabled" and "Disabled" does. Auto overvolts a lot, enabled lets the voltage drop a little from what you set in BIOS, disabled i haven't tried it, because it's supposed to be only for FX.
Edited by Undervolter - 3/4/13 at 11:41am
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post #12 of 19
Thread Starter 
Quote:
Originally Posted by Undervolter View Post

Oh, another thing. This is what happens with undervolting:

- When you are undervolting way lower than needed, you boot into Windows, it may seem stable, you can even pass Blend in Prime95. Where you will see failure is large FFT in Prime95 and it will reboot/BSOD.

- When you raise the voltage but you are still not at the right one, Prime95 will crash.
- When you raise voltage but still you are undervolting too much, you don't get BSOD, you don't get Prime crash, you get Prime stop with rounding error on one core. Then you know you 're close to the minimum needed voltage.

Yours sounds more being at the 1st stage (way too low voltage).

And remember. What counts is the effectively delivered voltage, not the one set in BIOS. You can set 1.4v in BIOS, if it gives 1.2v in reality, what matters is the 1.2v, not the 1.4v. See again your LLC. In my board, there is difference between what "Auto", "Enabled" and "Disabled" does. Auto overvolts a lot, enabled lets the voltage drop a little from what you set in BIOS, disabled i haven't tried it, because it's supposed to be only for FX.

I played with extreme LLC already, it helped a little bit, but barely at all. It was still loading at only like 1.23. Also, I had suspected the board initially, but the fact that my Phenom worked fine made me think that couldn't be it. If it actually is the board's VRM phase going limp due to the draw, it's no big deal I guess. It rules out the CPU being faulty, and I can use it no problem as long as I don't fully load it. With that said, I'll probably pick up a higher end board for it later on down the road.
post #13 of 19
Quote:
Originally Posted by ice445 View Post

I played with extreme LLC already, it helped a little bit, but barely at all. It was still loading at only like 1.23. Also, I had suspected the board initially, but the fact that my Phenom worked fine made me think that couldn't be it. If it actually is the board's VRM phase going limp due to the draw, it's no big deal I guess. It rules out the CPU being faulty, and I can use it no problem as long as I don't fully load it. With that said, I'll probably pick up a higher end board for it later on down the road.

The Phenom is way more docile compared to FX. There are several boards that run fine Phenoms, but can't handle the FX. Here's why:

http://forums.anandtech.com/showpost.php?p=34588633&postcount=24

And there are also "140W" cerfified boards that still can't handle it.

I do find it weird that your board can't give more than 1.23v though. Either there is some "hidden" BIOS setting that i don't know or your board is dying... CPUs are rarely defective and i would sure leave that eventuality for last, if all else seemed working as expected. But you can't blame the CPU first, when the motherboard is giving just 1.23v. My Thuban boots at 1.23v, passes the first batch of Blend too if i remember correctly, but if you want it to pass a real 100% stability record, you have to bring it to 1.29v. And stock VID is 1.375, pretty much like many FXs.
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post #14 of 19
Thread Starter 
Quote:
Originally Posted by Undervolter View Post

The Phenom is way more docile compared to FX. There are several boards that run fine Phenoms, but can't handle the FX. Here's why:

http://forums.anandtech.com/showpost.php?p=34588633&postcount=24

And there are also "140W" cerfified boards that still can't handle it.

I do find it weird that your board can't give more than 1.23v though. Either there is some "hidden" BIOS setting that i don't know or your board is dying... CPUs are rarely defective and i would sure leave that eventuality for last, if all else seemed working as expected. But you can't blame the CPU first, when the motherboard is giving just 1.23v. My Thuban boots at 1.23v, passes the first batch of Blend too if i remember correctly, but if you want it to pass a real 100% stability record, you have to bring it to 1.29v. And stock VID is 1.375, pretty much like many FXs.

I technically didn't blame the CPU first, I blamed the motherboard. That's why I bought a Z77 board and a 3570K. The original plan was to get the FX only because I didn't have to get a new motherboard, although obviously that didn't work out as expected. With that said, this thread was more of a question as to if it's possible that the chip was in fact defective. I didn't really think it was considering it was stable everywhere else, and the abysmal voltage readings I was seeing with HWMonitor, but you know how it goes with software monitoring, it's not always necessarily accurate.

But regardless, I decided not to RMA even before you came into the thread. I have the CPU archived for now, and once I have some more money I'm planning on building a second computer with it (obviously going to get a new board to go with it). Thanks for the help though. Sucks having a $190 paperweight, especially since I want to play around with it, but I think I'll manage.
post #15 of 19
Yes, it does suck to have the top of the AMD CPUS currently and not using it. The only explanation i can find is that some capacitors of the mobo are bust. Although i don't know if solid capacitors give visible signs of failure nowdays. If i were you i 'd buy another a medium range motherboard and keep it just in case you want to put the FX back in action or else, sell the CPU while it's "hot" in the market.
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post #16 of 19
The secret: do increase dram voltage to 1.65v. That will make system stable. Its not the cpu. Its the 990fx chipset combined with 1866 Mhz Ram.
post #17 of 19
Quote:
Originally Posted by dinub1 View Post

The secret: do increase dram voltage to 1.65v. That will make system stable. Its not the cpu. Its the 990fx chipset combined with 1866 Mhz Ram.

That was my guess too. Shoot an email to G.Skill. They are pretty helpful and quick to respond.
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post #18 of 19
Your mosfets are roasting and rebooting the system
post #19 of 19
Thread Starter 
I appreciate the revival but I've had a new system for months now (it's in my sig). The 8350 was ebayed and the buyer never complained, so it was either the mem or the board. Memory works fine in my new rig so eh, oh well.
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