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You will notice the PC being affected by other things - such as when the A/C is turned on/off, dish washer, subwoofer, speakers, monitors, or the guitar amp, etc (any high powered device on the same line rounding around the house to each plug). Older houses are normally more affected by this - when you start getting a lot of devices connected in. They disturbed the power, create electrical noise on the line, and sudden drops/spikes in the power.
If this is the case, try separate plugs from each other, using a different power source. Depending on the house, this might not be possible.
To fix this issue - purchase a power conditioner, such as Furman PL-Plus CE. This is like a surge protection, but they won't help you - where this would. All separate each device plug to it's own line of clean/filtered power with SMP EVS + Lift. It will maintain the level of voltage to each - warning of low and protecting from extreme voltage (even if lightning striked). This is a good investment and idea to protect thousands of dollars worth of equipment for dirty power supplies, which would otherwise damage or even fry your system over time.
I'll take a look into the power distribution, Azza. I was wondering if it might have something to do with that, but I only have a signed power surger protector coming from the wall, and it tells me if the wiring in the building leading to the outlet is good or not. I've had the same devices plugged into it that I have since I moved here in July. I could try taking out the speakers I don't use, but we don't have an A/C. The only high powered devices besides our computers in out portion of the buildling is a dishwasher, and that's on the other side of the house. The two rigs we have are on separate outlets. I'll take a look into a power conditioner, though I'm still unconvinced and a little confused.
Why would this happen only when my computer is under load? I can see why those games, being that they are resources hungry games being new and all, but this isn't a regular occurence. Some previous research lead me to believe that I could possibly have a faulty PSU, but I have no way of knowing - that is, the voltage could output correctly and it may still be faulty. I can't rule that out from the 750w beacuse that PSU is three years old, I have no doubts that it could have faulted.
Advice appreciated, but that doesn't really help my situation at all. That doesn't tell me or give me any ideas as to why my PSU is failing. On a side note, my 7950 is a powerhog at 300w. As per my current build, I'd need a 950w-1000w to support two 7950s. I'm not worried about the power requirements, as that is not the nature of my situation. I have an 850w because I plan on upgrading my system in a way that will require more juice. I am well aware that I do not need 850w, however.
Don't know if this will help but I had the same problem as you with my HIS R9 270 on a 500W PSU with temps of 70-75 degrees when it crashes. My solution was to lower the clocks by 25% and it fixed the problem. Turns out that this HIS card model should run at underclocked settings (lower than the official AMD ones).
#1 reason is the PSU would of had a faulty rail or been overloaded by the system - normally the graphic card(s) draining out power from smaller components and the motherboard.
However, that new PSU should more than cover your system load.
#2 possible reason is overheating. Most motherboards have a thermo safety auto shut-off, if it detects extreme heat it might throttle your PC performance (CPU and/or GPU), failing that to cool off your system it will force shutdown everything - as it's the last option to prevent your motherboard from getting fried.
If your PC is clogged with dust, clean it out with a can of compressed air. Check if cables inside are blocking airflow or preventing fans from spinning, etc.
Move the PC case away from walls and low ceilings (such as under a table), where exhaust air might hot pocket and simply re-enter the system to be cycled around again.
#3 is dirty power as I mentioned before. I actually had this issue with my equipment when the A/C was turned on downstairs. My room is upstairs, but linked to the same power source and therefore it would drain the power from my guitar amp and effects / computer, surround and subwoofer. Was just for just a split second, before returning to normal. However, that second is enough to shutdown devices or cause speakers to pop. The only option was a power conditioner and it worked wonders for my equipment, plus improved audio quality of devices as no more line noise or distrution.
A good quality power conditioner however can be a little pricey, plus on top of that you have to purchase each plug cables as well. The cheap ones don't actually do anything, nor do surge protectors in this case. It will however replace the surge protector and multi-plug. Also I have over $12,000 worth of equipment running off it (guitar amps / effects / computer / surround / etc - up to 10 plugs available), it's cover by that power conditioner for up to $75,000 if any one of those components gets damaged by power. It's prolonged their lifespan greatly, and in my case was a good investment.
I have been reaching up to temps of 70-75C, but I've never had problems with that. My CPU was reaching in the 90s on my first build before it throttled. I'd rather find more efficient cooling rather than underclock however.
#1 I really feel as if it shouldn't be my PSU at this point, especially considering the issue persisted after I replaced the PSU. It wasn't at a loss, but urged me to do it sooner than I may have done before.
#2 I've had heating issues before on my rig before, but I've since installed a fan manager as my stock software would not raise my fans above 30%. I'm a little worried now that I think about it, because if my fans were cooling properly, I would hear the fans revving up at they approached 70-80C. I'll take a look into Afterburner and my fans momentarily. I just cleaned out all of the dust from my rig however, so I'm doubtful of the influence of dust there.
Even when I used to have heating problems, I would notice my hardware throttling before it simply shut down. Usually my fans working much harder than they needed and general performance plummeting.
As far as space goes, I have a 8 inch clearing above, several feet in front and 1.5 in the rear, as well as several feet on either side, and have never had problems with it before.
#3 I think my surge protector covers up to $4000~, but I'm not too concerned about that. I haven't looked into conditioners, but as of this post I'll be testing internal connectors, replacing my power cable, and testing different outlets within the house.
Checking plugs momentarily.
I honestly don't think my GPU is the problem. I do not overclock (yet), I am running stock clocks on all of my devices.
UPDATE: I may be the most collosal idiot alive right now. I did an OS reinstall recently, and had to readjust Afterburner. I may have accidentally unchecked auto adjust on my fans, as they're set to tax at 90% at 70C. Checking now.
Easily ^^^, even 2 x 7950 boost ttl system draw hits 459w for xfire and 272w for a single card.
So again Dancer rule out the psu and try the 650w tx it's MORE than enough watts to run you tower that might hit 270ish watts max, total , all together, whole tower.
http://www.techspot.com/review/802-amd-radeon-r9-295x2/page10.html
I'm not sure if you read my response to that post, but this thread is not about power requirements. I know how much power I need. I am trying to figure out why my computer shuts down when taxed and displays power surge/unstable PSU.
I quote "seeing as I needed roughly 615w to operate." you hopefully have learned this would be incorrect.
It is unclear if both psus have the same shutdowns if they do move to the next item on your list, sorry but there's no easy way around it.
Poor dirty power is a stretch but possible depending where you live.
I believe I stated before that the 650w was the original PSU. I bought the 850w because I thought the shutdowns were caused by my 650w. The problem persisted and I then assumed that it wasn't a PSU problem.
Fear not however, I have found the problem. My scale in MSI Afterburner had been reset, so I adjusted the settings. Turns out my GPU was just overheating. Thanks for everyone's help. SOLVED! <3