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Let's see...The only reason a computer wouldn't support a larger memory GPU is if the OS is 32bit, but all I see is Windows 7 x64 models, so that shouldn't be a problem (correct me if you have a 32 bit OS). Of course they want to sell you an obsolete video card at twice the price you can find it elsewhere. The XPS 8500 series is a mid-range system (graphically speaking) which is why I think they want to talk you into just 2GB video cards. Processor is fine, Intel H77 chipset so PCIe 3.0 x16 is fine. What's the +12v rating on the side of the PSU? That's going to limit what you can do without upgrading that.
Yolu are going the same way my thoughts were. Dell used to be the best place for tech services. I made my career buying Dell. But now? A coprocessor should not be limited that way and yes, it is 64bit Windows 10. I am watching the power requirements and will not look for over clocking, but if needed I could go for a better power supply. I do not know the 12V reading. How do I measure theat. I have a good VOM. Or is there a place in Windows to find that? I could use a short explanation if that is convenient.
It's on the sticker on the side of the PSU.
HD 7770 for 4K and HDMI 2.0 monitor? Are you serious? Via DP it may be possible, but not for games.Unless Tetris, maybe.
You are right about RX 480 (If you want 4K gaming or 4K Video).
HD 7770 has no 4K Video Hardware acceleration and no HDMI 2.0 support.
The only thing that may hold you back is the Power Supply if you plan on doing any serious O.C.'ing. And to get one that fits without bulging your case could be a trick as well.
Please let us know how you made out.