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Separate loop needed, or is this guy crazy?

post #1 of 3
Thread Starter 
I was browsing the internet reading about the different components of my pc, when I came across a thread on the ASUS ROG forum.

http://rog.asus.com/forum/archive/index.php/t-34774.html?s=64e0a08883e99ada393618e3e58fdf4a


MarshallR from ASUS says the following about the C5F-Z motherboard:
Quote:
AMD has validated the Crosshair V and Sabertooth 990FX as for use with its new FX 9590 and 9370 CPUs, however there is some advise we'd like to add for users upgrading (or even users running their FX-8350s at ~5GHz frequencies).

1) You MUST plug in the 8pin and 4pin CPU 12V power plugs: they are there for this kind of usage! A 5GHz FX CPU will certainly draw over the 300W limit on the 8pin cable. If your PSU has good OCT it will simply cut out and your system will suffer hard-reboots. If not, it will likely melt poorly constructed PSUs with cheap wiring under extensive stress, unless your PSU is specifically fitted with heavy-gauge (lower AUG rating) wiring.

2) Do not disable OCP if you're running 24/7, it will protect your CPU. If you're trying to run extreme voltage for benchmarking you will have to turn it off, but in that case we strongly recommend watercooling (or at least chilling) the VRMs.

3) As you'd expect, when pulling close to 400W the VRMs run hot. At a minimum active cooling from direct case airflow is therefore a must (and watch those temps). Still, we strongly recommend watercooling the VRMs (EK does a good block) and do NOT loop CPU into VRMs: create two loops. When you consider your loops take into account the heat you're trying to shift: we advise looking at >1 large radiators and/or even a chiller system is maybe worth considering if you're running several high-power items together.

Given the price of CPU and expected total system cost anyway, we don't feel it's unreasonable to match such a premium setup with the right hardware. After all, this is what extreme PCs are all about smile.gif

Number one kinda irks me, as there is no mention of this in the user manual, nor on their website, and I am having issues due to this. But number three I'm undecided on. Would you really need a separate loop for the VRMs?

I know they can get hot to the point that the factory heatsink is hot to the touch, but a separate loop under water? Right now I have a XSPC AX360 radiator with this motherboard and FX9370 in the same loop. Never had any problems with temps, or high temps for the CPU (I don't know about the VRMs, since as far as I know there is no program that will tell those temps - please correct me if I'm wrong and lead me to it). If a second loop is recommended, would adding a 240 rad to the existing loop eliminate the need for the second independent loop?
post #2 of 3
I'm not sure where he is coming from with running a separate loop for the VRMs and CPU, it should be fine - generally speaking VRMs don't need all that much cooling. If it can be cooled with indirect airflow on the, generally crappy, stock heatsinks it will not take all that much cooling under water.

The only thing to watch out for is restriction - VRM blocks can be fairly restrictive. Make sure your pump is up to the job and you are good to go.
Edited by GingerJohn - 4/16/14 at 5:40pm
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post #3 of 3
you dont need water cooled vrms really. as stated above they are very restrictive just like ram blocks

i run 1.56v constant on my sabertooth with my 9370 and i have an 80mm fan on 50-60% speed and it wont go over 55-60c under high load

you will need a fan though, it will go over 70c on high load

also i only have an 8 pin connector and hasnt given me any issues
 
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