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VRM cooling?

post #1 of 18
Thread Starter 
I just bought this mobo in a combo deal with a phenom II x4 955:

http://www.newegg.com/Product/Produc...82E16813131669

the prob is the mobo doesnt have VRM cooling and i bought also this one:

http://www.newegg.com/Product/Produc...82E16835708011

now i wanted to ask if those i highlighted in the pic are VRM's or not and if i should cool them as well, the ones below i am almost sure are VRM's dont they ?



thanks
Edited by supra_rz - 8/19/11 at 4:51am
post #2 of 18
A "VRM" includes the PWM controller, MOSFETs, inductors and capacitors that supply power to something. What you have highlighted are the MOSFETs, they are the main source of heat in a VRM. It wouldn't be a bad idea to put a heatsink on them. They should be rated at around 120 degrees centigrade but as always they will last longer the cooler you keep them.
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post #3 of 18
Thread Starter 
Quote:
Originally Posted by ARandomOWl View Post
A "VRM" includes the PWM controller, MOSFETs, inductors and capacitors that supply power to something. What you have highlighted are the MOSFETs, they are the main source of heat in a VRM. It wouldn't be a bad idea to put a heatsink on them. They should be rated at around 120 degrees centigrade but as always they will last longer the cooler you keep them.
oh i think i have to read more about mobos. Thanks
so those are the mosfets, what about the ones below them? above the R68? are those power phases? they need to be cooled ?
post #4 of 18
Get some of those little zalman heatsinks for graphics cards and stick them on there. It will cost you way less the a special dedicated vrm cooler.
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post #5 of 18
Quote:
Originally Posted by supra_rz View Post
oh i think i have to read more about mobos. Thanks
so those are the mosfets, what about the ones below them? above the R68? are those power phases? they need to be cooled ?
That's a good question. With the location and package type I would say they are all MOSFETs. I couldn't tell you for sure though. Can't think what else they would be.
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post #6 of 18
What you have highlighted are the driver chips. The bigger ones below that (in between those chips and the R68 squares/chokes) are the MOSFETs, which are the most important to be heatsinked. You will need to use 8 of the MOS-C1, and will have 2 left over. Although chokes can get hot, they are unlike MOSFETs in that they are not fragile because they are not active transistors.

Note that you should not expect reliable operation out of 4 phase power/AM2 base design and a 125W Phenom II processor.
post #7 of 18
Quote:
Originally Posted by xd_1771 View Post
What you have highlighted are the driver chips.
Of course! I am used to seeing the PWM controller with integrated driver
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post #8 of 18
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
What you have highlighted are the driver chips. The bigger ones below that (in between those chips and the R68 squares/chokes) are the MOSFETs, which are the most important to be heatsinked. You will need to use 8 of the MOS-C1, and will have 2 left over. Although chokes can get hot, they are unlike MOSFETs in that they are not fragile because they are not active transistors.

Note that you should not expect reliable operation out of 4 phase power/AM2 base design and a 125W Phenom II processor.
thanks for the advice, i wont oc with that board then.
post #9 of 18
Quote:
Originally Posted by xd_1771 View Post
What you have highlighted are the driver chips. The bigger ones below that (in between those chips and the R68 squares/chokes) are the MOSFETs, which are the most important to be heatsinked. You will need to use 8 of the MOS-C1, and will have 2 left over. Although chokes can get hot, they are unlike MOSFETs in that they are not fragile because they are not active transistors.

Note that you should not expect reliable operation out of 4 phase power/AM2 base design and a 125W Phenom II processor.
OK, is this true of any 4 phase power AM3 board and a 125 watt 965 X4 at stock settings, with no overclock?

I have a MSI 870A-G54 that I got on that Microcenter combo price mistake deal last week of a 840 X4 and MSI 870A-G54 for 92.00 AR. That's like getting the CPU for a good price and the board for free. I want to put a 965 X4 in it at stock settings

I know by reading on here that this board is not good for overclocking since it has no cooling on the VRM section. So much for their military grade components, eh? How are the quality of the parts on a MSI 870A-G54? Is it just a matter of adding copper cooling to the VRM? I won't be overclocking anything on it anyway, but I do wonder about the quality of the parts they used.
Thanks
post #10 of 18
He said it's not reliable, not that it can't be done. I OC'd my processor on my crappy (sig) board and have no problems yet. I know it could go downhill someday, but I guess it's a risk I am willing to take
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