I have a question. I used to have an ati 5770 and i trade it with a 275GTX my motherboard is an ASUS M4A785TD-M EVO and is supports a hybrid crossfire mode with the onboard graphics card which is an ati card so if you got ati card you get better performance but because this thing is built like this and the atieclxx.exe is always on does that decrease my gpu performance? sorry for the mistakes i just dont now how to explain.
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I recommend you use Driver Sweeper and sweep all unwanted ATI drivers off your system.