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Vdroop in 990FXA-UD7: Couple Questions

post #1 of 5
Thread Starter 
Hello. I recently posted about my new rig, in which I had a M5A98 LE R2.0 motherboard. I was having issues with temps and ultimately ruled it to be because of the VRMs on that motherboard. I was able to RMA it back with no issues. They issued me a full refund, and even paid for the return postage. So I decided to take that money and some more to buy a higher quality board. I ultimately ended up buying a Gigabyte 990FXA-UD7 motherboard. My old rig used a Gigabyte board and I didn't have any issues with it, so I though this would be a safe bet. Sadly, I didn't do as much research as I should have about this board (again, lol).

I installed it and it is running with no issues. So I decided to set to overclocking. I quickly noticed that I had to bump up the voltage quite a bit, just to get any sort of stability at 4.0GHz. I was finally able to get it stable, but that is when I started really noticing the vdroop. Now, I am pretty new to overvolting processors. My old rig I was able to overclock to what I wanted without even having to adjust the voltage. So I am kind of confused as to what I should be looking at. I have attached a picture showing what I am wanting to know. I know I am able to push this processor further than 4.0GHz. I have seen some insane overclocks with this processor. However, everything I am reading is saying not to push it over 1.5 volts. Now, what I am wanting to know. Since this board has such a problem with vdroop, should I be focusing more on the voltage at idle, or more on the voltage under full load. Right now, at 4.0GHz, it idles around 1.488V. However, under load, it drops to 1.368 volts. The VID says that it is 1.400 volts. I honestly don't know what I should be looking at. Should I be looking at the idle voltage, the full load voltage, or should I just pay attention to the VID? Any help would be greatly appreciated. Like I said, this is my first real attempt at overvolting, so I don't want to do anything to potentially damage my processor.

EDIT: I don't know if this will matter at all, but I am using the revision 3.0 version of the board.


Edited by stompysan - 8/6/13 at 1:31pm

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post #2 of 5
I have a rev 1.0 UD5 so it has the old BIOS on it, but there should be a few things you need to do:

1. Disable APM, it will probably be called something different for you though and I don't know what.

2. Find a good LLC setting (Load Line Calibration)
Tyrant Kuma
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Opteron 8431 Opteron 8431 Opteron 8431 Opteron 8431 
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CoolingCoolingOSPower
FX 8350 stock cooler FX 6300 stock cooler Gentoo Linux 2x Silverstone PSU 
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Tyrant Kuma
(13 items)
 
Starscythe
(13 items)
 
Mobility
(6 items)
 
CPUCPUCPUCPU
Opteron 8431 Opteron 8431 Opteron 8431 Opteron 8431 
MotherboardGraphicsRAMHard Drive
Super Micro h8qme-2+ Sapphire 4870 Samsung DDR2 ECC 667mhz western digital caviar blue 
CoolingCoolingOSPower
FX 8350 stock cooler FX 6300 stock cooler Gentoo Linux 2x Silverstone PSU 
Case
Custom Fabbed Steel Case 
CPUMotherboardGraphicsRAM
AMD FX 8350 gigabyte 990FXA-UD5 7970 Mushkin Enhanced Blackline 16GB 
OSOSMonitorKeyboard
Gentoo Linux Windows 7 x64 Yamakasi Catleap Q270 Corsair K90 
PowerCaseMouseAudio
Silverstone Strider Gold Evolution 850W 80 PLUS... Antec 1200 Logitech G9x Asus Xonar D2X 
Other
XSPC RS360 Raystorm with custom radiator mounts 
CPUGraphicsRAMOS
a4 5000 Radeon HD 8330 8GB G. Skill DDR3 1600 9-9-9 Gentoo Linux 
OSOther
Windows 7 Lenovo Thinkpad x140e 
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post #3 of 5
Quote:
Originally Posted by sdlvx View Post

I have a rev 1.0 UD5 so it has the old BIOS on it, but there should be a few things you need to do:

1. Disable APM, it will probably be called something different for you though and I don't know what.

2. Find a good LLC setting (Load Line Calibration)

Disable Turbo core too.

When ever I had turbo core enable it showed Stock vid for Turbo core of 1.40 volts. On my Rev 1.0

since your board is the newer Rev 3.0 it should have Load line calibration where cool and quite and C1E and APM all in that menu.
    
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CPUMotherboardGraphicsRAM
amd Phenom II x6 1090T gigabye UD7 990FX 5870 G.skill flare 2 x 4gbs 2000mhz  
Hard DriveCoolingOSMonitor
westerdigital cooler master eisberg 240L Vista 64 bit spceptre 1920 x 1200 
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muli-media ftw lol 1200 watt silverstone none another cheap one $20 
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none ATi 650 pro theater  
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post #4 of 5
with the gigabyte UDX boards I find that basically you can expect a 0.050v INCREASE of the vcore you manually set in the BIOS. Use this to your advantage, though.

If you require, say, 1.475vcore to remain stable at X clockspeed, set your BIOS to 1.425vcore. Under load you should be fine and it'll pump 1.475v through without a problem, then drop back to 1.425v when you're not gaming or whatever.
post #5 of 5
Thread Starter 
Thanks all that helped with this. I haven't been able to really play any games, let alone mess with overclock for a good while now. A lot of stuff with work came up and have been busy just about nonstop until this weekend. I was able to get LLC configured properly. Surprisingly it uses the same naming scheme and everything as the Rampage Extreme motherboards, which helped me out a lot in the long run. I set the LLC to High (50%) and am getting much better results. I am able to set the voltage in the BIOS to about 1.368 and actually get close to this! Drops to about 1.359, which is much better than it was dropping. It is stable at 1.359 too, which is great. Now I will definitely be able to push it further in the future. Thanks again everyone! biggrin.gif
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Overclock.net › Forums › AMD › AMD CPUs › Vdroop in 990FXA-UD7: Couple Questions