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Windows 7: HD 4870 X2: PSU issue

10 Nov 2012   #21

Windows 7 Pro X64 SP1

Quote   Quote: Originally Posted by Dorado View Post
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.

My System SpecsSystem Spec
12 Nov 2012   #22
Chalky Emultion sounds like the HD 4870 X2 it's Ati's most complicated card ever builded...
My System SpecsSystem Spec

 HD 4870 X2: PSU issue

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