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VRM cooling? - Page 2

post #11 of 18
Quote:
Originally Posted by markothevrba View Post
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
Well, that's what I asked him. I did not ask if it can be done. I asked if his statement of relaibility is true of any 4 phase power board and 125 watt CPUs. I know it can be done, I have built a few 4 phase boards and 125 watt CPUs, but I don't know how relaible they are in the long run. My main rig right now is a 8 phase Gigabyte board and a 965 X4, at stock speeds, so it should last a long time.
post #12 of 18
It's not that it won't run, but depending on the condition (i.e. will you be using aftermarket CPU cooling?) the 4-phase power on AM2 base design motherboard may not be exactly up to the task, causing loss of performance through CPU throttling inflicted by the VRM over-current protection feature on ASUS boards. The chip may also not OC as well due to the AM2 base design, disregarding VRM design altogether. AMD specs a 4+1 phase is normally a necessary minimum for such processors.

The MSI 870A-G54 is inherently worse. There is no such protection feature and the board will go from over-current to burning mess with no control. Coupled with the fact that the use of improperly sized drivers & transistors leads to a high failure rate with 125W processor, x4 and x6. That would actually make the 870A-G54 much worse than the board you are using for a high end 125W processor.

For more information, see sig link (About VRMs & MOSFETs - recently reorganized/rewritten for user convenience).
post #13 of 18
Thanks for the info guys.
Last year, I built up four GIGABYTE GA-MA785GM-US2H with 940 X 4 for a local office, just for office use. All have aftermarket CPU heatsinks with 120mm fans. Now I'm wondering if they will last in the long run. I'm thinking they probably idle most of the time, so they should be OK

I have a question on using a X6 1090T in a Gigabyte 880GA-UD3H. I was planning on building this up for a family member with a COOLER MASTER Hyper 212 Plus HSF, and a Cooler Master Gladiator 600 case. All at stock settings. Of course, the board has a 4 phase power VRM. I'm assuming this is a mistake?

Thanks
post #14 of 18
^ Aftermarket heatsinks is risky. You're deviating from the rated TDP (max 125W) of the motherboard by a fair bit (TDP is always rated not only at stock CPU speed but always with the stock cooler). These aftermarket heatsinks will ensure that those VRMs get no cooling whatsoever. Ambient heat can add up on the VRMs, causing faster degradation of the parts. The 785GM-US2H is an older 4+1 design that is classified as being known for problems. If they idle most of the time that is probably good, but I wouldn't trust that combination at all for long term application, or being on 24/7.

Similar goes for the 880GA-UD3H. Although the 880GA-UD3H uses a quality 4+1 VRM setup, the x6 pushes the limits of that 4+1 VRM setup by being pretty much one of the most VRM heavy AMD chips out there (in fact I normally recommend boards with bigger VRM setups for the x6, esp. when overclocking). You will want to ensure proper cooling - whether by separate VRM heatsink or use of stock CPU cooler.

There may be better boards for price than the GA-880GA-UD3H with better VRM setup as well. Have you looked at the pricing of the M5A88V-EVO from ASUS? It comes with higher quality 8+1 setup with heatsink, 880G chipset with integrated graphics, AND AM3+ socket for FX series processor expandability.
post #15 of 18
I understand what you are saying when using an aftermarket cooler, the VRM section may not get air blown across it. Hopefully, I'll be OK with this board and the 940 CPU I installed in those office desktop PCs. I doubt if they go over 50% usage very often. Funny, I was thinking I was doing better by going aftermarket cooling. I never liked how hot the 940 and 965 get with the stock heatpipe HSF, but the VRM section probably gets more airflow with it.
post #16 of 18
In my experience the stock AM3 125W+ heatpipes HSF has performed quite fashionably well. On a 140W C2 965 (that's right, I said 140W), the heatpipes stock heatsink managed to keep the CPU temperatures at bay (within 62C) overclocked to 3.7Ghz from 3.4Ghz. Trust me, I owned one.
post #17 of 18
Quote:
Originally Posted by xd_1771 View Post
In my experience the stock AM3 125W+ heatpipes HSF has performed quite fashionably well. On a 140W C2 965 (that's right, I said 140W), the heatpipes stock heatsink managed to keep the CPU temperatures at bay (within 62C) overclocked to 3.7Ghz from 3.4Ghz. Trust me, I owned one.
Hey XD,
Dont mean to get too off topic but about the VRM list, how did you figure out the ASRock 880gm-le has Shut-Off as VRM protection? I cant find that info anywhere.
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Zeek's
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post #18 of 18
I guess he really knows a thing or two about this stuff
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Minecraft Slayer
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Crucial M4 Atapi iHAS 124B - for obvious reasons :3 Noctua NH-D14 Windows 7 x64 
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LG Flatron W2442PE + Samsung SyncMaster 206BW Logitech K200 :P Seasonic S12G 550W Chieftec Big Tower 
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Logitech MX518 Razer Golatius Control 
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