Gtx 560 TI OC slows down computer to a crawl

[Robmo]

I had three gts 250 in sli and they ran no issue. Now I tried the gtx 560 TI and when I put it in the mobo. The resolution is low, after installing drivers, the Rex is normal but my CPU jumps from 3%- 96% ( usually 0 at idle). I notice as well when I move my cursor it jumps from from 3% to 30%. Also the mouse cursor freezes occasionally. Also my task manager doesn't show me where the resources are beig used. Just that they are.  The card is not defected. I sent it away to the retailer and they stress tested it. I bought one with a friend and I'm trying his, same issue. What bugs mr is that the 3 older cards draws more power than the new one. Pls help

My config is
Intel i7 930 @ 4.0 ghz ( I did try down clocking)
6gb of corsair dominator ram
2 hdd raid 7200 Rpm each

[Dark Mantis]

Hi and welcome.

If you haven't already done it try an extended clear of the CMOS followed by loading the Optimised BIOS Default settings and then making sure all instances of the original drivers are removed and the latest version installed.

Remove the power cable from the mains supply and then press the power switch on the case for a few seconds just to drain any residual energy in the PSU capacitors.

Once done remove the motherboard battery for at least one hour before replacing it.
 
Next plug back into the mains supply and boot.
 
You will now need to enter the BIOS by pressing DEL and load Optimised BIOS Defaults.

Make any other changes to the BIOS settings to suit your self like disabling the floppy drive, disabling the full screen logo and making the HDD the primary boot device and then press F10 to save and exit.

[Robmo]

Hi and welcome.

If you haven't already done it try an extended clear of the CMOS followed by loading the Optimised BIOS Default settings and then making sure all instances of the original drivers are removed and the latest version installed.

Remove the power cable from the mains supply and then press the power switch on the case for a few seconds just to drain any residual energy in the PSU capacitors.

Once done remove the motherboard battery for at least one hour before replacing it.
 
Next plug back into the mains supply and boot.
 
You will now need to enter the BIOS by pressing DEL and load Optimised BIOS Defaults.

Make any other changes to the BIOS settings to suit your self like disabling the floppy drive, disabling the full screen logo and making the HDD the primary boot device and then press F10 to save and exit.

Thank you very much for response. I will try this. To clarify do you mean 'mains' as in the motherboard power or gpu? Also I currently have current drivers. And my gts 250s use the same drivers as the gtx 560. Should I install new drivers before the card is placed in or after