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[Official] MSI 790FX-GD70 Owners Club - Page 945

post #9441 of 9641
Quote:
Originally Posted by sumitlian View Post

There is always a chance of death of 790FX GD70 with an overclocked 125watt X6 CPU even it is rev1.1 board because it has only 4 phase too. Let me tell you some important things related to 790FX gd70's Phase/VRM/MOSFETS as I have blown up three GD70. One of them was 890FXA GD70. Each phase can provide absolute maximum theoretical current of 40 Ampere (Mosfet name is = RENESAS R2J20406, you can search and download pdf). Maximum temp limit is 90c. It means 4 phase x 40 ampere = 160Ampere (max). Max value has never been safe for real world operations because at this peak point extreme heat occurs (close to 90c) which is very hard to cool. Remember as MOSFET temperature increases, the current carrying capacity of each phase reduces as well.
Now All Phenom II 125 watt CPU require 110 ampere current at factory clock (According to 'AMD's Power and Thermal data sheet', you can search and download pdf). This current requirement can easily be provided (At factory Clocks) from 4 phases because each phase will have to deliver only close to 28A, Which is safe for motherboard. But as you overclock CPU with increased voltage, current requirement of cpu also increases. It makes VRM to become more hot as current requirement of CPU goes close to maximum support of VRM.

my voltages were not changed and 400 mhz is a small push in frequency. this wouldnt be able to push the amps count much higher. ive also taken many precautions with this board. i have the vrms being cooled and cold air is being vented throughout the whole case. do appreciate the useful advice none the less. wish msi wasnt such a cheapout on their phases

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post #9442 of 9641
Keep in mind this board was released more than a year before the Thubans came out, so it wasn't really designed for the Hexacores. This isn't an excuse for their horrible VRM quality in the later models though and it's a bit sad that Bulldozer failed to advance the cheap, but potent PhenomII line.
    
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post #9443 of 9641
Quote:
Originally Posted by PuntyMario View Post

my voltages were not changed and 400 mhz is a small push in frequency. this wouldnt be able to push the amps count much higher. ive also taken many precautions with this board. i have the vrms being cooled and cold air is being vented throughout the whole case. do appreciate the useful advice none the less. wish msi wasnt such a cheapout on their phases

There is a formula to calculate Power Consumption.
1. Power consumption in Watt at overclocked = [ TDP x (Overclocked MHz / Stock MHz) x (Increased Voltage / Stock Voltage)^2 ] ........equation 1

Now we can calculate Current Requirement of CPU at this overclock by following formula, since we know that redface.gif Watt=Volt x Ampere )
2. Needed Current from VRMs (Ampere) = ( Watt at Overclocked from equation 1 / increased voltage)

If you want safer operation of MOSFETs in GD70 then do not let it bear the load over 120A - 125A.
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post #9444 of 9641
Quote:
Originally Posted by sumitlian View Post

There is a formula to calculate Power Consumption.
1. Power consumption in Watt at overclocked = [ TDP x (Overclocked MHz / Stock MHz) x (Increased Voltage / Stock Voltage)^2 ] ........equation 1
Now we can calculate Current Requirement of CPU at this overclock by following formula, since we know that redface.gif Watt=Volt x Ampere )
2. Needed Current from VRMs (Ampere) = ( Watt at Overclocked from equation 1 / increased voltage)
If you want safer operation of MOSFETs in GD70 then do not let it bear the load over 120A - 125A.

+1 thumb.gif
post #9445 of 9641
Quote:
Originally Posted by XT-107 View Post

+1 thumb.gif

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post #9446 of 9641
Quote:
There is a formula to calculate Power Consumption.
1. Power consumption in Watt at overclocked = [ TDP x (Overclocked MHz / Stock MHz) x (Increased Voltage / Stock Voltage)^2 ] ........equation 1

Now we can calculate Current Requirement of CPU at this overclock by following formula, since we know that redface.gif Watt=Volt x Ampere )
2. Needed Current from VRMs (Ampere) = ( Watt at Overclocked from equation 1 / increased voltage)

If you want safer operation of MOSFETs in GD70 then do not let it bear the load over 120A - 125A.

Quite useful information thumb.gif

But all of MOSFETs supply power to all computer parts: HDD, Memory modules, etc.

What I am saying is that if I have overclocked memory how would I know what is their TDP? Where should I search for this data? I have digital thermometer sticked at a side of my 2 RAM sticks. Real temperature is probably a little bit higher under heatsink. When they are under stress temp is sth like 39*C and 44*C (the second one is the closest to CPU).

My question is ... how to calculate Current Requirement for all my rig and all of these overclocked parts (GPU, Memory,) ?


Got one more question. I thought about Ram change and ... I wonder if these XMS3 — 8GB Dual Channel DDR3 Memory Kit (CMX8GX3M2A2000C9) are any good?
Not thinking about running them at 2000 MHz at this board but 1850 MHz would be satisfactionary for me smile.gif

What I like in these Ram Sticks is their low profile but it might be a problem with heat right?

Do you know any Ram Sticks (I don't mention Dominators) that would be fine and had bandwidth at least PC3-15000 or PC3-16000 ?
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post #9447 of 9641
The MOSFETs for each component is located elsewhere though. Only the CPU ones are part of the NB heatsink area.

Heatsinks aren't really necessary, as the Samsung ones I have don't even have any, but run cool most of the time (even when stressed). As long as you're not using RAM with 1.9v and higher it should run cool enough.
    
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post #9448 of 9641
Hey guys! Nobody has been able to figure this one out for me, and frankly I've posted elsewhere within OC and it wasn't too helpful.

I have the 790FX-GD70, and I recognize that it's a bit outdated... BUT...

So here's the deal... I'm not an utter noob when it comes to computers, but I'm completely befuddled by my current situation.

I recently installed windows 7 on my computer. To do so, I had to take out one stick of my G.skill 2 gb 1333 RAM (I don't get why). Now that windows 7 has been installed, I can't reinstall the RAM I took out. I bought new RAM, but every time I attempt to boot Windows with more than 2 gb, I don't get very far. The system says "Starting WIndows", and it stalls... permanently. It doesn't move forward. That, or it restarts and continues a vicious cycle of restarting. I should probably mention that I installed windows 7 over windows xp, with Windows xp being the 32 bit version and windows 7 being the 64 bit.

I've run memtest on each stick of ram individually, and no errors show up. But the minute I have both sticks of RAM in there it doesn't boot. Each and every motherboard slot is fine (More than 10+ test repetitions on both).

I've got the most current BIOS on the board, and I was able to have 4 gb of RAM on the 32 bit xp version I upgraded from with no problems (although it wasn't fully recognized).

I've used both sticks together in a friend's computer, and both work great (together or separate). I don't understand what's going on. Can someone help me out? I'll post pictures of my BIOS settings if it'll help... Honestly, most of it is on auto, and the 4 settings I would mess around with should be implemented by the board itself... 9-9-9-24.

Please please please help!!!!
post #9449 of 9641
That's definitely strange... I've tested out mixed RAM on my system before and it's worked out well, yet you only have one set. Can you be more specific about your parts? Please list your CPU, RAM, Hard drive(s). Also if possible, pictures of your BIOS settings?

Have you tried using a single stick of RAM on every slot and seeing if it registers and works well? The only thing I can really think of would be defective RAM slots, but you said it was working prior to your Win7 install, so that seems unlikely.
    
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post #9450 of 9641
Quote:
Originally Posted by Kokin View Post

The MOSFETs for each component is located elsewhere though. Only the CPU ones are part of the NB heatsink area.

Heatsinks aren't really necessary, as the Samsung ones I have don't even have any, but run cool most of the time (even when stressed). As long as you're not using RAM with 1.9v and higher it should run cool enough.

Really? I am surprised - I thought that they were the only MOSFETS for every part of computer. Let's just call me an ignorant in those matters ;D

And what would you say about combo of these Corsairs and Sabertooth 990 FX Asus MOBO ?
Because I am really considering to buy one.

Oh! Have you ever measured your Ram Sticks' temperature and if so, what was it ?
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