HD 4870 X2: PSU issue

[bobkn]

Ok, I'll search for a new PSU... The one which you provided sounds good, thank you

So it's sure that the problem because programs use only 1 graphics core is my PSU? Because the second core loads only with GPU-Z render test (it sounds like I'm forcing Crossfire to work)... when I play games, core 1 is loaded a lot (60-70%, sometimes 95-100%), and core 2 is ALWAYS loaded 0%...
Right now, performance in games is a little bit better than when I was using my "old" GTS 450... All I want is to be able to play games using both HD 4870 X2's GPUs.

Oh, and I noticed another thing... In GPU-Z, Ati Crossfire is enabled, but... It shows "sideport off"?...

I'm not very familiar with the 4870X2 (obviously), but the "sideport off" bit doesn't sound right. A little quick Googling suggests that the sideport is a feature unique to the 4870X2 involving communication between the CPUs. It appears that Crossfire wouldn't work without it.

Can't tell you how to activate it.

 

[Chalky Emultion]

...it sounds like the HD 4870 X2 it's Ati's most complicated card ever builded...