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VRM -Safe Temp? W??

post #1 of 9
Thread Starter 
I have read quite a few articles on VRM's and I have yet to find a reasonable safe temp (TMPIN0..I think on my board). (Max hit 62C, Max at 141.6W running Prime95 torture)

After over an hour of Prime95 my CPU topped out at 50C with an ambient of 22C.
Modest clock of 3.5@1.39v max hit 1.41
(HwM\\Coretemp\\CpuZ)

http://valid.canardpc.com/show_oc.php?id=1695257

Do I have much more headroom? Whats my limit?

M4A77TD (VRM Heatsinks on order)(4+1)
1055T (Stock Cooler)
A-DATA - DDR3 1600 (1667 @1.59v) Passed Overnight MemTest4
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post #2 of 9
The 4+1 combination and that 6-core are a very, very bad mix. Very high chance your VRMs may catch on fire.
    
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post #3 of 9
Quote:
Originally Posted by brewermoe View Post
I have read quite a few articles on VRM's and I have yet to find a reasonable safe temp (TMPIN0..I think on my board). (Max hit 62C, Max at 141.6W running Prime95 torture)

After over an hour of Prime95 my CPU topped out at 50C with an ambient of 22C.
Modest clock of 3.5@1.39v max hit 1.41
(HwM\\Coretemp\\CpuZ)

http://valid.canardpc.com/show_oc.php?id=1695257

Do I have much more headroom? Whats my limit?

M4A77TD (VRM Heatsinks on order)(4+1)
1055T (Stock Cooler)
A-DATA - DDR3 1600 (1667 @1.59v) Passed Overnight MemTest4
From my experience, ASUS mobos have great quality VRMs. I've oc'ed my 1090t on a 4+1 phase M4A785-M to 3.8ghz @1.41v/cpu/nb 2600mhz @ 1.3v. After 12hrs Prime95 default blend, my temps were almost identical to yours. My cpu socket temp maxed out @ 62c and core temps @ 49c on a Zalman 9500A. Any higher and I would get temp related stability issues. So I stuck with the 3.8ghz.

I kept that oc 24/7 for about a year and the rig ran great even without aftermarket heatsinks on the VRM's. At one point, I took a laser thermometer to the VRM's (voltage regulator, mosfets, and chokes) and ran Prime95. One of the mosfets topped out at 60c (which is still quite safe, as most 'FETS are rated to max at >90c from what i've read). But just to be on the safe side, I installed heatsinks and a 60mm fan above it to actively cool the VRM's. Never had any issues.

I wouldn't go any higher on your oc until you get a better cpu heatsink. After that, i bet you can get a stable 24/7 oc @ 3.8ghz on that board


At first I mounted the 60mm fan using outdoor strength double sided adhesive. As I thought about it awhile, I came up with an idea supergluing a screw on top of the blue usb port. I found a screw thin enough for the fan hole to slide through. I then secured it with a lock-nut. Now I have the option to mount the fan on and off. Should I decide to sell the mobo, the guy who buys it is gonna wonder what the screw sticking up from the usb port is for


Edited by piranhamoose - 3/6/11 at 9:15am
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post #4 of 9
Quote:
Originally Posted by MR KROGOTH View Post
The 4+1 combination and that 6-core are a very, very bad mix. Very high chance your VRMs may catch on fire.
I've never seen that happen on an ASUS board. It's usually MSi. My friend had a Q6600 at 1.4v 4.1GHz constantly on a 3+1 board (P5N-D) under heavy abuse for years. Also there is an OCN member running his 1090T at 4GHz on an M4A88TD-M mobo which has no FET cooling and is 3+1 or 4+1 I know.
 
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post #5 of 9
Quote:
Originally Posted by MR KROGOTH View Post
The 4+1 combination and that 6-core are a very, very bad mix. Very high chance your VRMs may catch on fire.
Not necessarily. These ASUS VRMs are not low RDS (on) so they may run hot, but at least are of quality. He is using the stock CPU cooler which is fine. I still recommend adding some sort of VRM cooling before attempting any overclocking though.

8ight: That would be 4-phase on Intel LGA775, no split phase. Since the VRMs were powering the CPU only at the time there wasn't too much need for good VRMs. Plus on those older Intel boards VRMs were more spaced out.
Whoever's running 1090T 4Ghz M4A88TD-M no VRM cooling... very, very unwise. Who is this person?
Edited by xd_1771 - 3/6/11 at 1:31pm
post #6 of 9
Thread Starter 
Coolmaster hyper 212 and some Enzotec mos-c1's are on order... trying to build a smokin PC on a Budget!!

So how much further can I push this Cpu without frying VRM's?
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post #7 of 9
Quote:
Originally Posted by brewermoe View Post
Coolmaster hyper 212 and some Enzotec mos-c1's are on order... trying to build a smokin PC on a Budget!!

So how much further can I push this Cpu without frying VRM's?
Not far. Keep it at or below 1.4v I'd say.
 
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post #8 of 9
Quote:
Originally Posted by xd_1771 View Post
Not necessarily. These ASUS VRMs are not low RDS (on) so they may run hot, but at least are of quality. He is using the stock CPU cooler which is fine. I still recommend adding some sort of VRM cooling before attempting any overclocking though.

8ight: That would be 4-phase on Intel LGA775, no split phase. Since the VRMs were powering the CPU only at the time there wasn't too much need for good VRMs. Plus on those older Intel boards VRMs were more spaced out.
Whoever's running 1090T 4Ghz M4A88TD-M no VRM cooling... very, very unwise. Who is this person?
I don't recall. Saw the thread a long while ago.
 
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post #9 of 9
I recommend keeping it at 1.45V or below for your 24/7 overclock on this ASUS board.
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