Hello Technical Support !
It will consume less power, but for the sake of peace of mind I'd get the credit card out...
I got myself one of these and consider it a great purchase (quieter and higher overclocks with it):
It isn't so much the Watts, but the ampage. Your 400W psu probably doesn't kick out 30A (most do 20) and you're also short on watts anyway.
On the psu itself there is a sticker (every psu has one) that states it's output on it's various lines if it doesn't say 30A anywhere, then that is your problem.
Do you have the model of the psu available?
Oh, and if you're running your rig as it is, you're pushing your psu beyond its limit... overclocking a cpu and risking a cpu is one thing, stressing a psu is risking everything (except external peripherals) is something else.
PSU is an Eagle. DR-B400 ATX.
I'm now a bit more worried about the temperature issue ! Using the ATI Tool utility you can monitor the gpu temp. It's sitting at about 70 whilst just using windows. If I run the show 3d view option which just runs a small cube rotating in 3d then the temp jumps up towards 95 and the screen corrupts in the same way as normal. Sometimes the ATI recovery console then kicks in and restarts the card and returns the screen to normal. Does this sound more like a temperature problem than psu ? Or is 95 perfectly normal and it's just the psu issue manifesting itself.
Not sure why it should be overheating. The fan on the card is working fine as are the other fans in the machine....
Edit, 95 isn't key, it dies at 75 or 85 if it feels like it !
I don't know what temp ATI cards run at. With the latest driver release I can't even check the temp of my own Nvidia...
Check the heatsink on the card, has it lifted slightly on one end? Maybe not contacting with the chip properly. Just because the fan is spinning, it won't make any difference if the sink isn't making full contact. My old Athlon used to have leaps in temperature due to a clip that was so old it wasn't holding the (very) weighty heatsink in place.
I'm now inclined to go back to the issue of temps, but a view of this page reveals that only two power supplies have been certified for use with single cards that are of less than 500W:
One is from Be Quiet presumably specialists in HTPC gear, and the other is from Enermax - a reknowned purveyor of high quality psus.
12 years agoWell the nice new Enermax 620W PSU I ordered didn't resolve the problem Mid rebuild now....