No you can also take out many pre builts actually. Its basically the same as doing it yourself. I can take it out on all my pre builts jsut like a DIY. But to be on the safe side Id just DIY
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5200+X2 @ 3.12Ghz | AC Freezer Pro | Gigabyte 790GX | 2 gigs OCZ Reper | Saphire HD4850 @ 700Mhz/1045Mhz | 22" Samsung
3600+X2 @ 2.6Ghz | Gigabyte 570i | XFX 7600GT SLI