Just wanted to share the details of my build and ask opinions about temperatures under stress.
Asus P8H67-i Deluxe
Intel i5 2400S (65W)
2 x Corsair 4gb 1333MHz DDR3
Samsung 128GB SSD 830 series
HDPlex H3.SODD fanless passive HTPC case
Win XP 32-bit (as I had it lying around). Might upgrade to Win 7 64-bit.
This computer has to be 100% reliable as it will be doing mission critical data-logging and processing. So firstly I’ve basically left it at the un-overclocked standard settings, turned off any power settings and turned off the processor’s Turbo mode.
I’m stress testing using the Blend setting of Prime95 with Realtime priority. Logging temperatures is harder than I thought it would be: Asus’ own software gives different numbers than speed fan. Seems to be some kind of aggregate? Anyway, after an hour of Prime95 we have:
Asus AI Suite
Cores: 69C, 68C, 70C, 71C
Above RAM slots: 59C
So, the CPU temp seems okay. But how is this motherboard temp? I might also try reinstating some of the power saving features for idle time.
Okay, I’ve been doing some testing and my gut is that the 80W internal power supply might be insufficient.
I was reading this post ( http://www.hd-plex.com/forum/showpos…0&postcount=10 ) and see that a 35W TDP processor in a similar system to mind is asking for 42W during prime. Looking at the specs. of the 80W supply, it’s actually a 60W supply in this setup as there is no air cooling, and since my m/b was up at 60C we could be looking at around 46W maximum power output (60 x 0.975^10). And, of course, my processor is 65W TDP so could easily need an extra 10W or so juice under stress.
Might be totally irrelevant, but also the 12V rail is quite low according to the BIOS at 11.6V.
I’m trying an overnight Prime95 now with an ATX from another desktop, so let’s see if that crashes. The only problem is, I can’t close the case so the MB temp will be different. But if we’re stable in the morning, I guess I’m one step closer!
Oh, and Merry Christmas!
Just a final post to share my conclusions if it’s helpful for anyone building a similar system to mine. In the end it looks likely that the internal 80W power supply is not a *quite* sufficient for use in this system combination and useage. It might well be fine for HTPC use, but it’s not stable under any settings for number crunching or anything requiring the GPU to work hard.
I’m going to try out the PicoPSU option now, and maybe try and sell the 80W supply on ebay (or, more likely, throw it away). Good luck with your own builds!