Sounds like your PSU's are defective or it's an electrical issue with you house. I use a TX850 that is over a year old in my rig that consumes more power than yours and have had zero issues with it..
Could be house power, for sure.
I think we're
not about the same for power use, though. I think you've got it backwards, I'm pretty sure I'm pulling more power through cpu/gpus. What I'm missing in waterpump is easily made up in fans, soundcard and USB devices, as well as multiple monitors on the vgas pushing up the GPU a bit.
Both are fine @ stock, 100%. If you figure that AMD recommends a 500w PSU for just one card, and add the possible 225w from the second card, you've got 725w. I think 225w is a safe estimate, as AMD recommends a 550W PSU for single 6970...again, add in a possible 300W, and you are at 850W.
Fully clocked, I'm pushing 5.5ghz on the Sandybridge, and 1050/1450 on the VGAs. PSU is a huge factor when pushing clocks to the max, and I doubt anyone here is currently pushing similar clocks.
Could be because I'm got all the memory slots full, so the cpu is a bit more sensitive. In the end, the Antec 1200w works fine, as does the systems with just one card, and "reasonable" clocks.
Keep in mind, I'm pushing much more than the average user, and am not refering to "daily" clocks...I run stock pretty much day to day.
It's worth noting that XFX has told me that my 750W
should be OK too.
Id agree with Erocker as well, Im using an HX850 and 6950's pushed as well as the cpu and all the extra shit sucking power from the psu, hasnt given a problem at all.
The HX is a MUCH better unit than the TX. I think you need to be REALLY picky if going 750W, but 850W is about right for most users.