Overclock.net › Forums › AMD › AMD Motherboards › AMD BIOS › Gigabyte 990FXA Bios flash to VRM MOS protection issue
New Posts  All Forums:Forum Nav:

Gigabyte 990FXA Bios flash to VRM MOS protection issue

post #1 of 4
Thread Starter 
My 990FXA-UD5 is still running the F3 bios. I looked at the updated bios list available, and I see 7 updates since mine haha. The following updates were applied to the bios:

-F10b
Update CPU AGESA 1.2.7.1
Update AHCI ROM 3.1.0.0
Improve SSD compatibility
-F9
Modify ET6 function
-F8
Add VRM MOS protectionsniper.gif
-F7
Update CPU AGESA 1.2.0.2
-F6
Update AGESA 1.1.0.0 code
-F5
Update CPU AGESA 0.0.9.2 for AM3+
Update Dolby Home Theater version
Add Touch BIOS support
-F4
Modify memory compatibility with using AM3+ CPU under Win7
-F3
Update CPU AGESA rev0.0.7.5
Modify ET6 function


The big one that I care about is F8, which added the VRM protection. But some silly things are going on. HWmonitor is doing the classic TMPIN spikes. I just ran Prime95, and look at TMPIN1 (which is the CPU?). TMPIN2 (northbridge?) had already spiked to that 82C before i ran prime. I run a water loop that idles at 25-27C, so a 90c temp is just wrong for the CPU...
SystemTemp3Sept.JPG?psid=1


Question: If I install VRM protection, will the mobo throttle my voltages when it spikes like this? If not, should I flash to any of the other versions up there? I would like the safety of VRM protection, but I've yet to have any problems with the Mosfets, and my mobo has a strong 1GHz overclock and runs stable in benches like a dream. Thoughts?
AeroMini III
(20 items)
 
 
CPUMotherboardGraphicsRAM
intel i7 4790k ASUS IMPACT VII XFX R9 295x2 Corsair Vengeance 
Hard DriveCoolingCoolingCooling
Samsung 840 Evo D5 Vario Pump XSPC Reservoir Black Ice 160 Radiator 
CoolingCoolingCoolingCooling
Black Ice Stealth GT 240 Radiator EK WB ASUS Impact MOBO Waterblock EK WB 295x2 Waterblock BitFenix PWM Fans - White 
OSMonitorKeyboardPower
Windows 10 Pro Acer T272HL Logitech K800 Seasonic Platinum 1000 
CaseMouseAudio
Corsair Air 240 Corsair M65 HiFiMeDIY Asyncronys USB DAC 
  hide details  
Reply
AeroMini III
(20 items)
 
 
CPUMotherboardGraphicsRAM
intel i7 4790k ASUS IMPACT VII XFX R9 295x2 Corsair Vengeance 
Hard DriveCoolingCoolingCooling
Samsung 840 Evo D5 Vario Pump XSPC Reservoir Black Ice 160 Radiator 
CoolingCoolingCoolingCooling
Black Ice Stealth GT 240 Radiator EK WB ASUS Impact MOBO Waterblock EK WB 295x2 Waterblock BitFenix PWM Fans - White 
OSMonitorKeyboardPower
Windows 10 Pro Acer T272HL Logitech K800 Seasonic Platinum 1000 
CaseMouseAudio
Corsair Air 240 Corsair M65 HiFiMeDIY Asyncronys USB DAC 
  hide details  
Reply
post #2 of 4
Hey steezebe ! You really don't need VRM protection for the CPU you have (PII X4 955BE).
As you know we have 8+2 phase VRM configuration.
I wanted to know the VRM specification of our UD5, hence I looked into the VRM of our UD5. There is "SiC769" written on each VRM.

Here is the PDF describing tech specification:
http://www.vishay.com/docs/64981/sic769cd.pdf

Referring to main article:


This shows each "Sic769" VRM can provide 35 Ampere current. And We have 8 VRMs for our CPU. This means we have total of 280 Ampere current (8 x 35 Ampere) to feed our CPU.

Now heading to your CPU's default current requirement: (Taken from "AMD Power and thermal Data Sheet")


Your Phenom II X4 955 BE requires 110 Ampere max current at default clock. It means this current requirement will be split to our 8 phases.
And Theoretically each phase will deliver 13.75 Ampere (110 Ampere / 8 phase). This shows our VRM can easily run your 955 at default clocks.

But you have overclocked your CPU to 4.2GHz. And we need to find the current requirement at this overclock. Firstly we need to find Power Consumption at load and then we divide this value by the voltage you had applied for 4.2GHz. Then we get current requirement of this overclock (Ampere = Watts / Volts ).


There is a formula to calculate dynamic CPU power consumption:

Power Consumption(Watts) = [ TDP X {overclocked frequency in MHz / default frequency in MHz} X { Overvoltage / default voltage }^2 ]

I don't know what CPU voltage you have set, and hence I estimate it as 1.525volts with default clock voltage of 1.300volt (just for example)

Now your CPU power consumption at 4.2GHz with full load is:
[ 125 X { 4200 / 3200 } X { 1.525 / 1.300 }^2 ] = 225.76 Watts

Now we divide this by 1.525 volts
225.76 Watts / 1.525 volts = 148 Ampere.
This means 148 Amperes / 8 phase = 18.5 Ampere per phase or VRM.

As you can see each phase is easily capable to provide 35 Ampere current. But your overclock needs only 18.5 Ampere per phase.

YOUR MOTHERBOARD VRMS/PHASES ARE ABSOLUTELY SAFE AS THEY ONLY HAVE TO DELIVER 53% CURRENT OF THE TOTAL POWER THEY CAN PROVIDE.

Therefore you don't specifically need to use the BIOS ver. F8 fixing VRM MOS Protection. This type of VRM protection is only for FX 8120 and FX 8150 because some UD3 have died when those extreme power hungry FX 8 core CPU were overclocked to 4.8-5+GHz. You can freely use what best suits to your CPU in terms of overclocking. Even I am using F7 because it suits best for my 1055T at 4.004Ghz (286 x 14). I have tested my CPU at 4.0GHz at 1.456 load voltage for 13 hours in Prime95 without any issue. And of course my CPU at 4.0GHz consumes power exactly as your CPU does at 4.2GHz.

According to what I have experienced (I have burned two MSI 790FX GD70 and one MSI 890FXA GD70 motherboard, all had 4+1 phase) is that chances of VRM failure come into play when they have to deliver 80+% current of the total current they can provide. Because at this state VRM temperature exceeds the safe range (95c - 110c approximate). Therefore we are very very safe. I can guarantee you will never be able to blow up your board's VRM with X6 or X4 CPU with max overclock.

Those fluctuation in readings are wrong. I get those spikes too at high voltage, usually 1.50-1.55volts. They are monitoring application's flaw as sometimes they seems to have trouble reading exact temp, hence they randomly shows wrong reading. As VRM can easily feed the power required by 4.2GHz 955, there will be no throttling even at full load. You can test. Throttling will only happen when your CPU exceed the Critical temperature range (Tctl) which is about 61c. Just let "Thermal Protection" be enabled in BIOS and you'll be ok.
Haswell i3
(18 items)
 
  
CPUMotherboardGraphicsRAM
Core i3-4150 @ 3.5 GHz Asus B85M-G Rev 1.01, Bios: 2501 AMD Radeon HD 7850 ♥ 1GB 2x 4GB DDR3 1600 MHz CL9 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 750 EVO 250GB Seagate Barracuda 1TB 7200.14 Seagate 500 GB 2.5" Samsung DVD/RW 
CoolingOSMonitorKeyboard
Corsair H70 Windows 10 64 bit Samsung A300N 20" 1600 x 900 60Hz 5ms 19Watt PS/2 Microsoft Wired Keyboard 500 
PowerCaseMouse
Corsair TX850 V2 CoolerMaster Elite 430 Black Logitech M170 
  hide details  
Reply
Haswell i3
(18 items)
 
  
CPUMotherboardGraphicsRAM
Core i3-4150 @ 3.5 GHz Asus B85M-G Rev 1.01, Bios: 2501 AMD Radeon HD 7850 ♥ 1GB 2x 4GB DDR3 1600 MHz CL9 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 750 EVO 250GB Seagate Barracuda 1TB 7200.14 Seagate 500 GB 2.5" Samsung DVD/RW 
CoolingOSMonitorKeyboard
Corsair H70 Windows 10 64 bit Samsung A300N 20" 1600 x 900 60Hz 5ms 19Watt PS/2 Microsoft Wired Keyboard 500 
PowerCaseMouse
Corsair TX850 V2 CoolerMaster Elite 430 Black Logitech M170 
  hide details  
Reply
post #3 of 4
Thread Starter 
Sumitlian, I'm humbled by your explanation. I haven't had an engineering-style walk through in a while; I brought me right back to college! haha. here is my REP+

I think I'll just stay with the current bios then, as I don't want to re-overclock it again and I don't need an updated bootstrap or memory list. Thanks for the info again!
AeroMini III
(20 items)
 
 
CPUMotherboardGraphicsRAM
intel i7 4790k ASUS IMPACT VII XFX R9 295x2 Corsair Vengeance 
Hard DriveCoolingCoolingCooling
Samsung 840 Evo D5 Vario Pump XSPC Reservoir Black Ice 160 Radiator 
CoolingCoolingCoolingCooling
Black Ice Stealth GT 240 Radiator EK WB ASUS Impact MOBO Waterblock EK WB 295x2 Waterblock BitFenix PWM Fans - White 
OSMonitorKeyboardPower
Windows 10 Pro Acer T272HL Logitech K800 Seasonic Platinum 1000 
CaseMouseAudio
Corsair Air 240 Corsair M65 HiFiMeDIY Asyncronys USB DAC 
  hide details  
Reply
AeroMini III
(20 items)
 
 
CPUMotherboardGraphicsRAM
intel i7 4790k ASUS IMPACT VII XFX R9 295x2 Corsair Vengeance 
Hard DriveCoolingCoolingCooling
Samsung 840 Evo D5 Vario Pump XSPC Reservoir Black Ice 160 Radiator 
CoolingCoolingCoolingCooling
Black Ice Stealth GT 240 Radiator EK WB ASUS Impact MOBO Waterblock EK WB 295x2 Waterblock BitFenix PWM Fans - White 
OSMonitorKeyboardPower
Windows 10 Pro Acer T272HL Logitech K800 Seasonic Platinum 1000 
CaseMouseAudio
Corsair Air 240 Corsair M65 HiFiMeDIY Asyncronys USB DAC 
  hide details  
Reply
post #4 of 4
i am running the f10b on my 1055T and it is a poop bios for overclocking..... the F7 was so much better
Server1 - Main
(17 items)
 
Slow Coach
(17 items)
 
 
CPUMotherboardGraphicsRAM
4790K Asus z97 Hero Gigabyte 980Ti 6gb Kingston Hyper X 2400 
Hard DriveHard DriveHard DriveCooling
M500 M500 OCZ ARC H100i 
OSMonitorMonitorMonitor
Windows 10 Enterprise  Prolite GB2488HSU Prolite GB2488HSU Prolite GB2488HSU 
KeyboardPowerCaseMouse
Razer Corsair AX860 Fractal Design R4 Razer Mamba 
Audio
Razer 
CPUMotherboardRAMHard Drive
1055T Gigabyte 990fx UD5 corsair 4 x 2 GiG 2 x 1 terabyte Western Black 
Hard DriveOptical DriveCoolingOS
3 x 500 gig WD Black Pix Fractal Design Fans x 2 Server 2012 
MonitorKeyboardPowerCase
mstsc mstsc 400 watt corsair Fractal Design R5 
MouseOtherOtherOther
mstsc EATON 5110 UPS StarView SV231UADVI KVM LSI controller card 4 port 
Other
Intel DualPort Gigabit NIC PRO1000PT 
  hide details  
Reply
Server1 - Main
(17 items)
 
Slow Coach
(17 items)
 
 
CPUMotherboardGraphicsRAM
4790K Asus z97 Hero Gigabyte 980Ti 6gb Kingston Hyper X 2400 
Hard DriveHard DriveHard DriveCooling
M500 M500 OCZ ARC H100i 
OSMonitorMonitorMonitor
Windows 10 Enterprise  Prolite GB2488HSU Prolite GB2488HSU Prolite GB2488HSU 
KeyboardPowerCaseMouse
Razer Corsair AX860 Fractal Design R4 Razer Mamba 
Audio
Razer 
CPUMotherboardRAMHard Drive
1055T Gigabyte 990fx UD5 corsair 4 x 2 GiG 2 x 1 terabyte Western Black 
Hard DriveOptical DriveCoolingOS
3 x 500 gig WD Black Pix Fractal Design Fans x 2 Server 2012 
MonitorKeyboardPowerCase
mstsc mstsc 400 watt corsair Fractal Design R5 
MouseOtherOtherOther
mstsc EATON 5110 UPS StarView SV231UADVI KVM LSI controller card 4 port 
Other
Intel DualPort Gigabit NIC PRO1000PT 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD BIOS
Overclock.net › Forums › AMD › AMD Motherboards › AMD BIOS › Gigabyte 990FXA Bios flash to VRM MOS protection issue