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AMD FX-8120 weird problem.

post #1 of 16
Thread Starter 
Just got this chip today from a pre-order I placed month back.
First thing I did is boot in to bios and hardware status.
Temps look good 22C (current air temp 14C)
Then check out vcore which is 1.412?

Surely this is too high, Iv lowered it to 1.32 in the settings so whats the stock ment to be, Going to prime it at stock speeds on that voltaged just after I post this.
Edited by majinsoftware - 11/3/11 at 12:47am
Bulldozer Rig
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FX-8120 @ 5GHZ - 1.488v (http://valid.canardpc.... 990FXA-UD3 980ti 8GB 
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Bulldozer Rig
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FX-8120 @ 5GHZ - 1.488v (http://valid.canardpc.... 990FXA-UD3 980ti 8GB 
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post #2 of 16
Thread Starter 
Its not prime stable at that voltage and leaving it on auto is not prime stable ether it restarts the PC after 5mins

Its also doing weird stuff and under full load drops the multiplyer so its only 2.8ghz @ 1.28V.

I also tried settings everything manual but it just ignores the settings I put once there is full load.
All power saving features are disabled and changing the htlink stops it POSTing until Cmos is reset.

Im guessing its down to my mobo which is in my system. Iv emailed gagabyte since its advertised as supporting this cpu.

Guess i can try test it in my mates cpu to rule out the cpu.
Bulldozer Rig
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CPUMotherboardGraphicsRAM
FX-8120 @ 5GHZ - 1.488v (http://valid.canardpc.... 990FXA-UD3 980ti 8GB 
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Antec 620 Windows 7-SP1 64bit Antec neo eco 620W 
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Bulldozer Rig
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CPUMotherboardGraphicsRAM
FX-8120 @ 5GHZ - 1.488v (http://valid.canardpc.... 990FXA-UD3 980ti 8GB 
CoolingOSPower
Antec 620 Windows 7-SP1 64bit Antec neo eco 620W 
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post #3 of 16
I think you need to speak with AMD support. I have heard that some BD chips have a stability issue. Can you let us know which BSOD code you get?
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E IV
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post #4 of 16
Thread Starter 
No code since it doesnt BSOD, It just just restarts.
Bulldozer Rig
(14 items)
 
  
CPUMotherboardGraphicsRAM
FX-8120 @ 5GHZ - 1.488v (http://valid.canardpc.... 990FXA-UD3 980ti 8GB 
CoolingOSPower
Antec 620 Windows 7-SP1 64bit Antec neo eco 620W 
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Bulldozer Rig
(14 items)
 
  
CPUMotherboardGraphicsRAM
FX-8120 @ 5GHZ - 1.488v (http://valid.canardpc.... 990FXA-UD3 980ti 8GB 
CoolingOSPower
Antec 620 Windows 7-SP1 64bit Antec neo eco 620W 
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post #5 of 16
Thread Starter 
Been prime stable for 10mins now and still going.
Upped the NB and SB voltage +.3 since its trying to auto set the HT link to 2.4ghz and setting it manual stops POSTing.

Also managed to stop the multiplyer and voltage jumping around but setting all the P-states to stock speed of 3.1ghz with 15.5 multiplyer and 1.3V with
PhenomMsrTweaker.

Temps look good,
Cpu = 37C
NB = 48C
SB = 21C
Mosfets = 59C Were hitting 80s with the 1090T at 4.2Ghz

Its prime testing strange tho. 4 of the threads are half the speed of the others.
Such as 4 threads have done 6 tests and the other 4 have only done 2.


-----

To add to that Iv just noticed the NB speed is still jumping around. Between 800mhz and 2400mhz depending on load. Goes lower the longer there is full load.
Edited by majinsoftware - 11/3/11 at 12:46am
Bulldozer Rig
(14 items)
 
  
CPUMotherboardGraphicsRAM
FX-8120 @ 5GHZ - 1.488v (http://valid.canardpc.... 990FXA-UD3 980ti 8GB 
CoolingOSPower
Antec 620 Windows 7-SP1 64bit Antec neo eco 620W 
  hide details  
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Bulldozer Rig
(14 items)
 
  
CPUMotherboardGraphicsRAM
FX-8120 @ 5GHZ - 1.488v (http://valid.canardpc.... 990FXA-UD3 980ti 8GB 
CoolingOSPower
Antec 620 Windows 7-SP1 64bit Antec neo eco 620W 
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post #6 of 16
Thread Starter 
Got it working but only at 2.8ghz which is the speed of what the fx 8100 is meant to be.
So I guess it comes down to my board not supporting it properly,The way they wrote that is supports 8100 series probably means it only supports that one and not the higher models such as 8120 since its rock stable at this speed and all threads in prime are working at the same speed.

----

On another note just played a hour of BF3 with out it crashing which is good.
Dont know if it was a server update that fixed it but with my 1090t it was crashing every 30-40mins.
Also getting 2fps more even tho the closes are way different.
2.8ghz on the 8120 where I had 4.2ghz on the 1090t.
Edited by majinsoftware - 11/3/11 at 3:06am
Bulldozer Rig
(14 items)
 
  
CPUMotherboardGraphicsRAM
FX-8120 @ 5GHZ - 1.488v (http://valid.canardpc.... 990FXA-UD3 980ti 8GB 
CoolingOSPower
Antec 620 Windows 7-SP1 64bit Antec neo eco 620W 
  hide details  
Reply
Bulldozer Rig
(14 items)
 
  
CPUMotherboardGraphicsRAM
FX-8120 @ 5GHZ - 1.488v (http://valid.canardpc.... 990FXA-UD3 980ti 8GB 
CoolingOSPower
Antec 620 Windows 7-SP1 64bit Antec neo eco 620W 
  hide details  
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post #7 of 16
Quote:
Originally Posted by majinsoftware View Post
Got it working but only at 2.8ghz which is the speed of what the fx 8100 is meant to be.
So I guess it comes down to my board not supporting it properly,The way they wrote that is supports 8100 series probably means it only supports that one and not the higher models such as 8120 since its rock stable at this speed and all threads in prime are working at the same speed.
This is not a problem of motherboard but of the chip itself. You are probably aware that these processors were long delayed (these delays always happen FOR SOME SERIOUS REASON, not just randomly) and that the Global Foundries had/are still having problems manufacturing them.

Manufacturing is probaly not yet mature and there is a broader qualitative spread of processors than usual. Some people get fine pieces, some people get processor that needs a lot of voltage to be stable and that cannot work in 100% load as they are sold. They are stretched beyond their "comfortable zone".

One local guy here, who also reported high VID and downclocking of the CPU in load, said that his sample "felt comfortable" at around 3 GHz.

So my conclusion is, that the manufacturing process is still problematic and some chips are stretched well beyond where they should be.

BTW overclocking these CPUs in not necessary, they already are overclocked. Oveclocking them furher brings massive stress on components and if you have some loose often used PSU connector, you can have some problem:


Edited by StepanPepan - 11/3/11 at 3:17am
post #8 of 16
Quote:
Originally Posted by StepanPepan View Post
This is not a problem of motherboard but of the chip itself. You are probably aware that these processors were long delayed (these delays always happen FOR SOME SERIOUS REASON, not just randomly) and that the Global Foundries had/are still having problems manufacturing them.

Manufacturing is probaly not yet mature and there is a broader qualitative spread of processors than usual. Some people get fine pieces, some people get processor that needs a lot of voltage to be stable and that cannot work in 100% load as they are sold. They are stretched beyond their "comfortable zone".

One local guy here, who also reported high VID and downclocking of the CPU in load, said that his sample "felt comfortable" at around 3 GHz.

So my conclusion is, that the manufacturing process is still problematic and some chips are stretched well beyond where they should be.

BTW overclocking these CPUs in not necessary, they already are overclocked. Oveclocking them furher brings massive stress on components and if you have some loose often used PSU connector, you can have some problem:

Holy scare tactics!

In any manufacturing process there are going to be duds. Especially in electrical manufacturing.
I once got a stick of ddr2 corsair RAM that took a ram slot down with it. So automatically i should NEVER overclock corsair ram, or buy it. No, it was a dud, corsair did its due diligence. Im running corsair 5 years later in my current rig.
Again, dont be scared to overclock. I took my 8120 to 3.8 on 1.2625 volts, which is actually an under-volt.
Just because Stepan cant overclock his cpus correctly, does not mean no one should.
Keep posting your results here, and we'll try and help in a constructive way as much as we can.
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Vishera
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Haswell
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Samsung 840 Pro 128gb SSD Intel 320 80gb DROBO 10TB (5x2TB) NAS Corsair H100 
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post #9 of 16
Quote:
Originally Posted by StepanPepan View Post

Learn how to properly install connectors please.
post #10 of 16
That is not my connector and I already wrote, that it was caused more by the connector being loose due to frequent reconnecting. High power draw had its role too, probably. Of course, it might be just a pure coincidence that it melted with Bulldozer.

BTW it was published by Obr with comment: "Look how turned out PSU cable on 8120 with 1.45V under load ... be carefull". If you do not believe/like him, blame it on his stupidity and careless maintenance of his equipment and not on Bulldozer!
Edited by StepanPepan - 11/3/11 at 1:51pm
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