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Can someone explain the APU crossfire idea?

Sep 17, 2013
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System Name Case of Human Kindness
Processor i5-2500K Oced to 4.4GHz @ 1.28 volts stable.
Motherboard Asus P8P67 ATX Socket 1155
Cooling Cooler Master Hyper 212
Memory 8GB of A-DATA Gaming Series DDR3 @ 1600 MHz
Video Card(s) Zotac GTX 1060 6GB
Storage 1TB Toshiba 7200RPM SATA
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Case Zalman Z3 ATX Mid Tower
Power Supply EVGA 600B 80+ Bronze
I have been out of the loop for a while, and I just recently started learning about the new AMD APUs. To make this more complicated, I have heard some people talking about a crossfire configuration with a GPU and the APU. This is extremely confusing for me. Can someone help explain this? I just purchased a A4-4000 and a R7 240, which is a large part of the reason I'm asking this question.

Thanks in advance.
Nov 9, 2010
5,159 (1.99/day)
Processor Intel i7 950 @ 3.2GHz
Motherboard ASUS P6X58D-E
Cooling Corsair H50 push/pull
Memory Kingston HyperX 1600 8GB
Video Card(s) Sapphire HD 7970 OC
Storage Plextor M5P 128GB/WD Black 2x1TB,1x6TB/Seagate 1TB
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Mouse Logitech G402
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Software W10 Pro 64 bit
It's kinda like the hybrid multi GPU config some laptops use but with AMD's APUs it will only work with up to so powerful a video card. Something like 7770 I think is the highest video card you can go with as far s I know.

So basically it gives you good bang for buck in a budget gaming PC price range, but beyond that point it can't compete because you lose the hybrid option with higher end video cards.